1-(2-amino-4-bromophenyl)ethanone

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42-7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06-7.03 (m, 1H), 5.18-5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42-7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06-7.03 (m, 1H), 5.18-5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Preparation of 1-(2-amino-4-bromophenyl)ethanone Under an argon atmosphere a solution of 3-bromoaniline (31.3 g, 181.8 mmol) and acetonitrile (75 g, 1.818 mol) in anhydrous toluene (120 ml) was added dropwise over 2.5 hours to a stirred solution of boron trichloride (23.4 g, 200 mmol) in (200 ml) hexanes cooled in an ice bath. After the addition was completed, aluminum chloride (26.6 g, 200 mmol) was added portion wise over 30 minutes. The mixture was allowed to warm to ambient temperature and then heated at reflux for 16 hours with stirring. The reaction mixture was then cooled to 10° C. and 100 mL of a 3N HCl solution was added dropwise with continued stirring. After the addition was complete, the mixture was heated at reflux for 3.5 hours, then cooled to room temperature, and the layers separated. The aqueous layer was extracted with chloroform (3×250 ml). Organic layers were combined, dried over magnesium sulfate, filtered, and concentrated to give the title compound (9.58 g, 25%). 1H NMR (CDCl3, 300 MHz): δ 7.54 (d, 1H, J=8.8 Hz), 6.83 (d, 1H, J=1.9 Hz), 6.75 (dd, 1H, J=8.4, 1.8 Hz), 2.54 (s, 3H) ppm. Step 2: Preparation of benzyl 8-bromo -5-methyl-2-oxo-2,3-dihydro-1H-1,4-benzodiazepin-3-ylcarbamate Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol), then N,N-dimethylformamide (38 ml) were added dropwise to the suspension. The reaction mixture was stirred at 0 ° C. in an ice bath for 30 minutes, at which point no further gas evolution was noted. Then a solution of 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) in anhydrous methylene chloride (60 ml) was added dropwise. The reaction mixture was allowed to warm to room temperature over 12 hours, then quenched with water (200 ml), and extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered and concentrated to give a semi-solid which was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml). Ammonia gas was bubbled through this solution for 2.5 hours. The reaction was then concentrated to a viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction mixture was diluted with water (100 ml) and then made basic (pH=10) with 25% sodium hydroxide, while stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and concentrated. The resulting residue was purified on silica gel, eluting with 40% ethyl acetate in hexanes to give the title compound (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42-7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06-7.03 (m, 1H), 5.18-5.08 (m, 3H), 2.50 (s, 3H) ppm. Step 3: Preparation of benzyl 8-bromo-1,5-dimethyl-2-oxo-2,3-dihydro-1H-1,4-benzodiazepin-3-ylcarbamate The product of Step 2 (2.0 g, 4.98 mmol) was dissolved in anhydrous N,N-dimethylformamide (10 ml). To this solution was added potassium carbonate (1.72 g, 12.44 mmol) and iodomethane (0.847 g, 5.97 mmol), and the reaction mixture was sealed in a pressure flask and stirred for 12 hours at room temperature, then diluted with water and ethyl acetate (20/70 ml). The aqueous solution was then extracted with ethyl acetate (3×20 ml). The organic layers were combined, washed with water (1×100 ml), dried over magnesium sulfate, filtered and concentrated to give the title compound (1.58 g, 77.5%). 1H NMR (CDCl3, 300 MHz): δ 7.43-7.28 (m, 7H), 6.68 (d, 1H, J=8.1 Hz), 5.15-5.05 (m, 3H), 3.38 (s, 3H), 2.45 (d, 3H, 1.5 Hz) ppm. Step 4: Preparation of 3-amino-8-bromo-1,5-dimethyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one The product of Step 3 (0.831 g, 2.00 mmol) was dissolved in anhydrous anisole (16 ml) and then methanesulfonic acid (3.84 g, 40 mmol) was added in one portion. The reaction mixture was heated to 40° C. for 30 minutes with stirring, then cooled to 0° C. in an ice bath and made basic (pH=10) with concentrated ammonium hydroxide. The aqueous solution was then extracted with chloroform (3×50 ml) and the organic layers combined, dried over magnesium sulfate, filtered and concentrated to give the crude product. Purification on silica gel, eluting with 10% methyl alcohol in chloroform, providing the title compound as an XXXX (0.463 g, 82%). 1H NMR (CDCl3, 300 MHz): δ 7.32-7.23 (m, 3H), 4.12 (d, 1H, J=1.1 Hz), 3.27 (s, 3H), 2.30 (d, 3H, J=1.5 Hz) ppm. to warm to room temperature over 12 hours quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered concentrated to give a semi-solid which Ammonia gas was bubbled through this solution for 2.5 hours The reaction was then concentrated to a viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours while stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered concentrated The resulting residue was purified on silica gel eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol), then N,N-dimethylformamide (38 ml) were added dropwise to the suspension. The reaction mixture was stirred at 0° C. in an ice bath for 30 minutes, at which point no further gas evolution was noted. Then a solution of 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) in anhydrous methylene chloride (60 ml) was added dropwise. The reaction mixture was allowed to warm to room temperature over 12 hours, then quenched with water (200 ml), and extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered and concentrated to give a semi-solid which was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml). Ammonia gas was bubbled through this solution for 2.5 hours. The reaction was then concentrated to a viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction mixture was diluted with water (100 ml) and then made basic (pH=10) with 25% sodium hydroxide, while stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and concentrated. The resulting residue was purified on silica gel, eluting with 40% ethyl acetate in hexanes to give the title compound (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1 H), 7.42-7.31 (m, 6 H), 7.12 (d, 1 H, 1.5 Hz), 7.06-7.03 (m, 1 H), 5.18-5.08 (m, 3 H), 2.50 (s, 3 H) ppm. to warm to room temperature over 12 hours quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered concentrated to give a semi-solid which Ammonia gas was bubbled through this solution for 2.5 hours The reaction was then concentrated to a viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours while stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered concentrated The resulting residue was purified on silica gel eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol), then N,N-dimethylformamide (38 ml) were added dropwise to the suspension. The reaction mixture was stirred at 0° C. in an ice bath for 30 minutes, at which point no further gas evolution was noted. Then a solution of 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) in anhydrous methylene chloride (60 ml) was added dropwise. The reaction mixture was allowed to warm to room temperature over 12 hours, then quenched with water (200 ml), and extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered and concentrated to give a semi-solid which was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml). Ammonia gas was bubbled through this solution for 2.5 hours. The reaction was then concentrated to a viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction mixture was diluted with water (100 ml) and then made basic (pH=10) with 25% sodium hydroxide, while stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and concentrated. The resulting residue was purified on silica gel, eluting with 40% ethyl acetate in hexanes to give the title compound (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1 H), 7.42-7.31 (m, 6 H), 7.12 (d, 1 H, 1.5 Hz), 7.06-7.03 (m, 1 H), 5.18-5.08 (m, 3 H), 2.50 (s, 3 H) ppm. to warm to room temperature over 12 hours quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered concentrated to give a semi-solid which Ammonia gas was bubbled through this solution for 2.5 hours The reaction was then concentrated to a viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours while stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered concentrated The resulting residue was purified on silica gel eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 162b (2.0 g, 4.98 mmol) was dissolved in anhydrous N,N-dimethylformamide (10 ml), to this was added potassium carbonate (1.72 g, 12.44 mmol) and iodomethane (0.847 g, 5.97 mmol) and the reaction was sealed in a pressure flask and stirred for 12 hours at room temperature. The reaction was diluted with water and ethyl acetate (20/70 ml). The aqueous solution was then extracted with ethyl acetate (3×20 ml). The organic layers combined, washed with water (1×100 ml), dried over magnesium sulfate, filtered and the filtrate concentrated to give the title compound 162a (1.58 g, 77.596). 1H NMR (CDCl3, 300 MHz): δ 7.43-7.28 (m, 7H), 6.68 (d, 1H, J=8.1 Hz), 5.15-5.05 (m, 3H), 3.38 (s, 3H), 2.45 (d, 3H, 1.5 Hz) ppm. the reaction was sealed in a pressure flask The aqueous solution was then extracted with ethyl acetate (3×20 ml) washed with water (1×100 ml) dried over magnesium sulfate filtered the filtrate concentrated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl-alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42-7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06-7.03 (m, 1H), 5.18-5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl-alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 162b (2.0 g, 4.98 mmol) was dissolved in anhydrous N,N-dimethylformamide (10 ml), to this was added potassium carbonate (1.72 g, 12.44 mmol) and iodomethane (0.847 g, 5.97 mmol) and the reaction was sealed in a pressure flask and stirred for 12 hours at room temperature. The reaction was diluted with water and ethyl acetate (20/70 ml). The aqueous solution was then extracted with ethyl acetate (3×20 ml). The organic layers combined, washed with water (1×100 ml), dried over magnesium sulfate, filtered and the filtrate concentrated to give the title compound 162a (1.58 g, 77.596). 1H NMR (CDCl3, 300 MHz): δ 7.43-7.28 (m, 7H), 6.68 (d, 1H, J=8.1 Hz), 5.15-5.05 (m, 3H), 3.38 (s, 3H), 2.45 (d, 3H, 1.5 Hz) ppm. the reaction was sealed in a pressure flask The aqueous solution was then extracted with ethyl acetate (3×20 ml) washed with water (1×100 ml) dried over magnesium sulfate filtered the filtrate concentrated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl-alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42-7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06-7.03 (m, 1H), 5.18-5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl-alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42–7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06–7.03 (m, 1H), 5.18–5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42–7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06–7.03 (m, 1H), 5.18–5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere 1H-1,2,3-benzotriazol-1-yl{[(benzyloxy)carbonyl]amino}acetic acid (6.71 g, 20.6 mmol) was suspended in anhydrous methylene chloride (92 ml) and cooled to 0° C. in an ice bath. Oxalyl chloride (2.61 g, 20.6 mmol) was added dropwise to the suspension, followed by N,N-dimethylformamide (38 ml) added dropwise. After the addition the reaction was stirred at 0° C. in an ice bath for 30 minutes, until no more gas evolved. Then 1-(2-amino-4-bromophenyl)ethanone (4.0 g, 18.7 mmol) and 4-methylmorpholine (2.84 g, 28.0 mmol) were added dropwise in anhydrous methylene chloride (60 ml) under stirring in an ice bath. The reaction mixture was then allowed to warm to room temperature and stirred over night. Reaction was quenched with water (200 ml), then extracted with ethyl acetate (3×250 ml). The organic layers were combined, dried over magnesium sulfate, filtered, and the filtrate was concentrated to give a residue. This residue was dissolved in tetrahydrofuran (120 ml) and methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours. The reaction was then concentrated to a very viscous light brown oil. The oil was dissolved in acetic acid (120 ml) and ammonium acetate (4.3 g, 56.1 mmol) was added in one portion and stirred for 12 hours. The reaction was diluted with water (100 ml) and then basified to pH=10 with 25% sodium hydroxide under stirring in an ice bath. The aqueous solution was then extracted with ethyl acetate (3×500 ml) and the organic layers combined, dried over magnesium sulfate, filtered and the filtrate concentrated to give a residue. The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes to give the title compound 162b (4 g, 53%). 1H NMR (CDCl3, 300 MHz): δ 9.90 (s-br, 1H), 7.42–7.31 (m, 6H), 7.12 (d, 1H, 1.5 Hz), 7.06–7.03 (m, 1H), 5.18–5.08 (m, 3H), 2.50 (s, 3H) ppm. added dropwise After the addition the reaction under stirring in an ice bath to warm to room temperature stirred over night Reaction was quenched with water (200 ml) extracted with ethyl acetate (3×250 ml) dried over magnesium sulfate filtered the filtrate was concentrated to give a residue methyl alcohol (35 ml) and then ammonia gas was bubbled through for 2.5 hours The reaction was then concentrated to a very viscous light brown oil The oil was dissolved in acetic acid (120 ml) stirred for 12 hours under stirring in an ice bath The aqueous solution was then extracted with ethyl acetate (3×500 ml) dried over magnesium sulfate filtered the filtrate concentrated to give a residue The residue was purified to silica gel column chromatography eluting with 40% ethyl acetate in hexanes