tert-butyl (2R)-2-amino-2-phenylacetate

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

Procedure: To a stirred solution of (R)-tert-butyl-2-amino-2-phenylacetate (1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, 1N aq. HCl and brine, dried (MgSO4), filtered and concentrated under reduced pressure. (R)-tert-butyl 2-(3,3-dimethylureido)-2-phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, 1H) 6.55 (d, J=7.32 Hz, 1H) 7.24-7.41 (m, 5H). LC-MS: Anal. Calcd. for C15H22N2O3 278.16 found 279.23 (M+H)+; HPLC PHENOMENEX® Luna C-18 4.6×50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT=2.26 min, 97% homogeneity index. the reaction was concentrated under reduced pressure the resulting residue was dissolved in ethyl acetate The organic layer was washed with H2O, 1N aq. HCl and brine dried (MgSO4) filtered concentrated under reduced pressure

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

Procedure: [4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetic acid (0.40 g, 0.827 mmol) was dissolved in CH2Cl2 (40 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.206 g, 0.993 mmol) and N-methylmorpholine (0.251 g, 2.48 mmol) were added. After 10 minutes, TBTU (0.345 g, 1.076 mmol) was added. The reaction was stirred overnight. The resulting tert-butyl ester was concentrated and purified on silica gel (eluted with EtOAc/CH2Cl2 25/75). The pure fractions were collected and concentrated. CH2Cl2 (25 ml) and TFA (3 ml) were added. The mixture was stirred for 5 days and the solvent was removed under reduced pressure. The residue was purified by preparative HPLC using a gradient of 20-70% CH3CN in 0.1M NH4OAc buffer. Freeze-drying of the pure fractions gave the title compound as a colourless solid. M/z: 615.50 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 4.35 (d, 1H), 4.36 (d, 1H), 4.40 (d, 1H), 4.53 (d, 1H), 4.58 (d, 1H), 4.94 (d, 1H), 5.19 (d, 1H), 6.97-7.40 (m, 15H), 8.02-8.06 (m, 2H), 8.26-8.32 (m, 1H). The resulting tert-butyl ester was concentrated purified on silica gel (eluted with EtOAc/CH2Cl2 25/75) The pure fractions were collected concentrated CH2Cl2 (25 ml) and TFA (3 ml) were added The mixture was stirred for 5 days the solvent was removed under reduced pressure The residue was purified by preparative HPLC Freeze-drying of the pure fractions

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

Procedure: [4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetic acid (0.40 g, 0.827 mmol) was dissolved in CH2Cl2 (40 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.206 g, 0.993 mmol) and N-methylmorpholine (0.251 g, 2.48 mmol) were added. After 10 minutes, TBTU (0.345 g, 1.076 mmol) was added. The reaction was stirred overnight. The resulting tert-butyl ester was concentrated and purified on silica gel (eluted with EtOAc/CH2Cl2 25/75). The pure fractions were collected and concentrated. CH2Cl2 (25 ml) and TFA (3 ml) were added. The mixture was stirred for 5 days and the solvent was removed under reduced pressure. The residue was purified by preparative HPLC using a gradient of 20-70% CH3CN in 0.1M NH4OAc buffer. Freeze-drying of the pure fractions gave the title compound as a colourless solid. M/z: 615.50 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 4.35 (d, 1H), 4.36 (d, 1H), 4.40 (d, 1H), 4.53 (d, 1H), 4.58 (d, 1H), 4.94 (d, 1H), 5.19 (d, 1H), 6.97-7.40 (m, 15H), 8.02-8.06 (m, 2H), 8.26-8.32 (m, 1H). The resulting tert-butyl ester was concentrated purified on silica gel (eluted with EtOAc/CH2Cl2 25/75) The pure fractions were collected concentrated CH2Cl2 (25 ml) and TFA (3 ml) were added The mixture was stirred for 5 days the solvent was removed under reduced pressure The residue was purified by preparative HPLC Freeze-drying of the pure fractions

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

Procedure: (2R)-({[4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl)amino)(phenyl)acetic acid (0.040 g, 0.065 mmol) was dissolved in CH2Cl2 (5 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.016 g, 0.078 mmol) and N-methyl-morphiline (0.020 g, 0.195 mmol) were added. After 5 minutes TBTU (0.027 g, 0.084 mmol) was added. The reaction was allowed to stir at room temperature for 3 h after which the resulting tert-butyl ester was purified on silica gel and eluted with EtOAc/CH2Cl2 25/75. Pure fractions were concentrated. The residue was dissolved in CH2Cl2 (3 ml) and TFA (0.5 ml). The reaction mixture was allowed to stir overnight at room temperature. The resulting acid was concentrated and the remaining trace of TFA was removed by co-evaporation with toluene (3 ml). The acid was dissolved in MeOH (3 ml) and NaBH (0.010 g, 0.260 mmol) was added. After 5 minutes, full conversion to the corresponding alcohol was obtained. The reaction was quenched by the addition of 1 ml of 0.1M NH4OAc buffer. Concentration followed by purification on preparative HPLC using a gradient of 20-50% CH3CN in 0.1M NH4OAc buffer as mobile phase and freeze-drying of the pure fractions afforded the title compound (0.034 g, 70%) as a colourless solid. M/z: 750.4 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 2.88-2.94 (m, 2H), 4.23-4.29 (m, 1H), 4.56-4.65 (m, 2H), 4.70-4.78 (m, 1H), 4.91-5.06 (m, 2H), 5.65-5.75 (m, 1H), 6.93-7.42 (m, 22H), 8.54-8.69 (m, 2H). was purified on silica gel eluted with EtOAc/CH2Cl2 25/75 Pure fractions were concentrated The residue was dissolved in CH2Cl2 (3 ml) The resulting acid was concentrated the remaining trace of TFA was removed by co-evaporation with toluene (3 ml) The acid was dissolved in MeOH (3 ml) After 5 minutes

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

Procedure: (2R)-({[4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl)amino)(phenyl)acetic acid (0.040 g, 0.065 mmol) was dissolved in CH2Cl2 (5 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.016 g, 0.078 mmol) and N-methyl-morphiline (0.020 g, 0.195 mmol) were added. After 5 minutes TBTU (0.027 g, 0.084 mmol) was added. The reaction was allowed to stir at room temperature for 3 h after which the resulting tert-butyl ester was purified on silica gel and eluted with EtOAc/CH2Cl2 25/75. Pure fractions were concentrated. The residue was dissolved in CH2Cl2 (3 ml) and TFA (0.5 ml). The reaction mixture was allowed to stir overnight at room temperature. The resulting acid was concentrated and the remaining trace of TFA was removed by co-evaporation with toluene (3 ml). The acid was dissolved in MeOH (3 ml) and NaBH (0.010 g, 0.260 mmol) was added. After 5 minutes, full conversion to the corresponding alcohol was obtained. The reaction was quenched by the addition of 1 ml of 0.1M NH4OAc buffer. Concentration followed by purification on preparative HPLC using a gradient of 20-50% CH3CN in 0.1M NH4OAc buffer as mobile phase and freeze-drying of the pure fractions afforded the title compound (0.034 g, 70%) as a colourless solid. M/z: 750.4 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 2.88-2.94 (m, 2H), 4.23-4.29 (m, 1H), 4.56-4.65 (m, 2H), 4.70-4.78 (m, 1H), 4.91-5.06 (m, 2H), 5.65-5.75 (m, 1H), 6.93-7.42 (m, 22H), 8.54-8.69 (m, 2H). was purified on silica gel eluted with EtOAc/CH2Cl2 25/75 Pure fractions were concentrated The residue was dissolved in CH2Cl2 (3 ml) The resulting acid was concentrated the remaining trace of TFA was removed by co-evaporation with toluene (3 ml) The acid was dissolved in MeOH (3 ml) After 5 minutes

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

Procedure: To a stirred solution of (R)-tert-butyl-2-amino-2-phenylacetate (1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, 1N aq. HCl and brine, dried (MgSO4), filtered and concentrated under reduced pressure. (R)-tert-butyl 2-(3,3-dimethylureido)-2-phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, 1H) 6.55 (d, J=7.32 Hz, 1H) 7.24-7.41 (m, 5H). LC-MS: Anal. Calcd. for C15H22N2O3 278.16 found 279.23 (M+H)+; HPLC PHENOMENEX® Luna C-18 4.6×50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT=2.26 min, 97% homogeneity index. the reaction was concentrated under reduced pressure the resulting residue was dissolved in ethyl acetate The organic layer was washed with H2O, 1N aq. HCl and brine dried (MgSO4) filtered concentrated under reduced pressure

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

Procedure: To a stirred solution of (R)-tert-butyl-2-amino-2-phenylacetate (1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, 1N aq. HCl and brine, dried (MgSO4), filtered and concentrated under reduced pressure. (R)-tert-butyl 2-(3,3-dimethylureido)-2-phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, 1H) 6.55 (d, J=7.32 Hz, 1H) 7.24-7.41 (m, 5H). LC-MS: Anal. Calcd. for C15H22N2O3 278.16 found 279.23 (M+H)+; HPLC PHENOMENEX® LUNA C-18 4.6×50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT=2.26 min, 97% homogeneity index. the reaction was concentrated under reduced pressure the resulting residue was dissolved in ethyl acetate The organic layer was washed with H2O, 1N aq. HCl and brine dried (MgSO4) filtered concentrated under reduced pressure

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

Procedure: To a stirred solution of (R)-tert-butyl-2-amino-2-phenylacetate (1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, 1N aq. HCl and brine, dried (MgSO4), filtered and concentrated under reduced pressure. (R)-tert-butyl 2-(3,3-dimethylureido)-2-phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, 1H) 6.55 (d, J=7.32 Hz, 1H) 7.24-7.41 (m, 5H). LC-MS: Anal. Calcd. for C15H22N2O3 278.16 found 279.23 (M+H)+; HPLC PHENOMENEX® LUNA C-18 4.6×50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT=2.26 min, 97% homogeneity index. the reaction was concentrated under reduced pressure the resulting residue was dissolved in ethyl acetate The organic layer was washed with H2O, 1N aq. HCl and brine dried (MgSO4) filtered concentrated under reduced pressure

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

Procedure: To a solution of 1,1-dioxo-3-butyl-3-ethyl-5-phenyl-7-bromo-8-(2-carboxyethoxy)-2,3,4,5-tetrahydro-1,5-benzothiazepine (Method 89; 70 mg, 0.134 mmol) and (R)-α-(t-butoxycarbonyl)benzylamine (J. Amer. Chem. Soc.; EN; 117; 44; 1995; 10879–10888; 35 mg, 0.169 mmol) in DCM (2.5 ml) was added 2,6-lutidine (29 mg, 0.268 mmol) and TBTU (56 mg, 0.174 mmol). The reaction mixture was stirred at room temperature for 2.5 hours, then diluted with DCM. The solution was washed with NaHCO3 (aq, sat), water, dried and the solvent was evaporated under reduced pressure. The residue was suspended in ether/petroleum ether and the crystals filtered to give the title compound 85 mg (89%). NMR (500 MHz) 0.79–0.86 (m, 6H), 1.04–1.28 (m, 4H), 1.35–1.56 (m, 11H), 1.60–1.77 (m, 2H), 2.82 (t, 2H), 3.13–3.25 (m, 2H), 3.72 (brs, 2H), 4.35–4.44 (m, 2H), 5.54 (d, 1H), 6.95 (d, 1H), 7.04 (t, 1H), 7.08 (d, 2H), 7.15 (s, 1H), 7.29–7.43 (m, 6H), 7.52 (s, 1H). The solution was washed with NaHCO3 (aq, sat), water dried the solvent was evaporated under reduced pressure the crystals filtered

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

Procedure: To a stirred solution of (R)-tert-butyl-2-amino-2-phenylacetate (1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, 1N aq. HCl and brine, dried (MgSO4), filtered and concentrated under reduced pressure. (R)-tert-butyl 2-(3,3-dimethylureido)-2-phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, 1H) 6.55 (d, J=7.32 Hz, 1H) 7.24-7.41 (m, 5H). LC-MS: Anal. Calcd. for C15H22N2O3 278.16 found 279.23 (M+H)+; HPLC PHENOMENEX® Luna C-18 4.6×50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT=2.26 min, 97% homogeneity index. the reaction was concentrated under reduced pressure the resulting residue was dissolved in ethyl acetate The organic layer was washed with H2O, 1N aq. HCl and brine dried (MgSO4) filtered concentrated under reduced pressure

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

Procedure: [4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetic acid (0.40 g, 0.827 mmol) was dissolved in CH2Cl2 (40 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.206 g, 0.993 mmol) and N-methylmorpholine (0.251 g, 2.48 mmol) were added. After 10 minutes, TBTU (0.345 g, 1.076 mmol) was added. The reaction was stirred overnight. The resulting tert-butyl ester was concentrated and purified on silica gel (eluted with EtOAc/CH2Cl2 25/75). The pure fractions were collected and concentrated. CH2Cl2 (25 ml) and TFA (3 ml) were added. The mixture was stirred for 5 days and the solvent was removed under reduced pressure. The residue was purified by preparative HPLC using a gradient of 20-70% CH3CN in 0.1M NH4OAc buffer. Freeze-drying of the pure fractions gave the title compound as a colourless solid. M/z: 615.50 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 4.35 (d, 1H), 4.36 (d, 1H), 4.40 (d, 1H), 4.53 (d, 1H), 4.58 (d, 1H), 4.94 (d, 1H), 5.19 (d, 1H), 6.97-7.40 (m, 15H), 8.02-8.06 (m, 2H), 8.26-8.32 (m, 1H). The resulting tert-butyl ester was concentrated purified on silica gel (eluted with EtOAc/CH2Cl2 25/75) The pure fractions were collected concentrated CH2Cl2 (25 ml) and TFA (3 ml) were added The mixture was stirred for 5 days the solvent was removed under reduced pressure The residue was purified by preparative HPLC Freeze-drying of the pure fractions

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

Procedure: (2R)-({[4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl)amino)(phenyl)acetic acid (0.040 g, 0.065 mmol) was dissolved in CH2Cl2 (5 ml) and tert-butyl (2R)-amino(phenyl)acetate (0.016 g, 0.078 mmol) and N-methyl-morphiline (0.020 g, 0.195 mmol) were added. After 5 minutes TBTU (0.027 g, 0.084 mmol) was added. The reaction was allowed to stir at room temperature for 3 h after which the resulting tert-butyl ester was purified on silica gel and eluted with EtOAc/CH2Cl2 25/75. Pure fractions were concentrated. The residue was dissolved in CH2Cl2 (3 ml) and TFA (0.5 ml). The reaction mixture was allowed to stir overnight at room temperature. The resulting acid was concentrated and the remaining trace of TFA was removed by co-evaporation with toluene (3 ml). The acid was dissolved in MeOH (3 ml) and NaBH (0.010 g, 0.260 mmol) was added. After 5 minutes, full conversion to the corresponding alcohol was obtained. The reaction was quenched by the addition of 1 ml of 0.1M NH4OAc buffer. Concentration followed by purification on preparative HPLC using a gradient of 20-50% CH3CN in 0.1M NH4OAc buffer as mobile phase and freeze-drying of the pure fractions afforded the title compound (0.034 g, 70%) as a colourless solid. M/z: 750.4 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 2.88-2.94 (m, 2H), 4.23-4.29 (m, 1H), 4.56-4.65 (m, 2H), 4.70-4.78 (m, 1H), 4.91-5.06 (m, 2H), 5.65-5.75 (m, 1H), 6.93-7.42 (m, 22H), 8.54-8.69 (m, 2H). was purified on silica gel eluted with EtOAc/CH2Cl2 25/75 Pure fractions were concentrated The residue was dissolved in CH2Cl2 (3 ml) The resulting acid was concentrated the remaining trace of TFA was removed by co-evaporation with toluene (3 ml) The acid was dissolved in MeOH (3 ml) After 5 minutes