2-amino-N-propan-2-ylacetamide

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In an open, 50 mL two-necked round bottom flask, a neat mixture of compound 3-(3-chlorophenyl)-7-methoxyisochromen-1-one (1.00 g, 3.49 mmol) and 2-amino-N-isopropylacetamide (INTERMEDIATE I.1) (2.02 g, 17.4 mmol, 5 eq) was heated to 120° C. under argon for 3 days, adding absolute EtOH in aliquots (2 mL) daily to loosen up the reaction mixture. The residue was purified by chromatography on silica gel with ethyl acetate:hexane (1:3, v/v) as eluent to give 2-[3-(3-chlorophenyl)-7-methoxy-1-oxo-1H-isoquinolin-2-yl]-N-isopropylacetamide (0.985 g, 2.56 mmol, 73%) as a white solid. The residue was purified by chromatography on silica gel with ethyl acetate:hexane (1:3

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

Procedure: A solution of 2-amino-N-isopropylacetamide (11.3 g, 97.0 mmol) and N,N-diisopropylethylamine (20.1 g, 162 mmol) in dichloromethane (200 mL) was cooled using an ice water bath. A solution of 5-fluoro-2-nitrobenzoyl chloride (16.5 g, 81.0 mmol) in dichloromethane (200 mL) was added dropwise over 15 minutes. The resulting solution was stirred overnight. The reaction mixture was washed with 2N HCl solution (2×250 mL), brine (250 mL) and then dried over magnesium sulphate. The solution was filtered before concentrating under reduced pressure to afford 5-fluoro-N-(2-(isopropylamino)-2-oxoethyl)-2-nitrobenzamide (18.5 g, 65.0 mmol). The reaction mixture was washed with 2N HCl solution (2×250 mL), brine (250 mL) dried over magnesium sulphate The solution was filtered before concentrating under reduced pressure

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

Procedure: To a solution of 5-fluoro-2-nitrobenzoic acid (370 mg, 2.0 mmol) in anhydrous DMF (5 mL) was added 1-hydroxybenzotriazole hydrate (330 mg, 2.4 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (460 mg, 2.4 mmol) and 2-amino-N-isopropylacetamide (INTERMEDIATE I.1) (230 mg, 2.0 mmol). The resultant mixture was stirred at room temperature for 18 h. The reaction mixture was concentrated in vacuo, the crude yellow residue dissolved in EtOAc (20 mL) and washed with dilute HCl (aq.) (3×5 mL), sat. NaHCO3 (aq.) (3×5 mL) and brine (1×5 mL). The organic layer was dried (Na2SO4), concentrated in vacuo and purified by chromatography on silica gel with MeOH:DCM (1:19, v/v) as eluent to afford 5-fluoro-N-(isopropylcarbamoylmethyl)-2-nitrobenzamide (INTERMEDIATE IV.1) (400 mg, 1.4 mmol, 70%) as yellow solid. The reaction mixture was concentrated in vacuo the crude yellow residue dissolved in EtOAc (20 mL) washed with dilute HCl (aq.) (3×5 mL), sat. NaHCO3 (aq.) (3×5 mL) and brine (1×5 mL) The organic layer was dried (Na2SO4) concentrated in vacuo purified by chromatography on silica gel with MeOH:DCM (1:19, v/v) as eluent

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

Procedure: To a solution of 5-fluoro-2-nitrobenzoic acid (2.3 g, 12.4 mmol) in dichloromethane (20 mL) was added oxalyl chloride (3.2 g, 2.2 mL, 24.8 mmol) dropwise. After 1 h the solution was concentrated to dryness. 2-Amino-N-isopropylacetamide (INTERMEDIATE I.1) (0.30 g, 2.6 mmol) was dissolved in dichloromethane (20 mL) and diisopropylethylamine (DIEA) (6.8 mL, 38.9 mmol) added. The acid chloride in dichloromethane (10 mL) was added dropwise and the reaction mixture stirred at room temperature for 18 h. The reaction mixture was concentrated in vacuo, the residue dissolved in dichloromethane and washed with 1 N NaOH (aq.), 1 N HCl (aq.) and brine. The organic layers were dried (MgSO4) and concentrated in vacuo to yield 5-fluoro-N-(isopropylcarbamoylmethyl)-2-nitrobenzamide (2.7 g, 9.5 mmol, 81%) as a yellow solid. After 1 h the solution was concentrated to dryness The reaction mixture was concentrated in vacuo the residue dissolved in dichloromethane washed with 1 N NaOH (aq.), 1 N HCl (aq.) and brine The organic layers were dried (MgSO4) concentrated in vacuo

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

Procedure: A mixture of 2-amino-5-[(S)-(+)-3-hydroxy-2-methylpropoxy]benzoic acid hydrochloride (200 mg, 0.76 mmol), 2-amino-N-isopropylacetamide*HCl (INTERMEDIATE I.1) (105 mg, 0.70 mmol) and triethylamine (0.23 mL, 1.68 mmol) in DMF (5 mL) was stirred at room temperature for 5 min. EDC (176 mg, 0.92 mmol) and HOBt (124 mg, 0.92 mmol) were added and stirring continued at room temperature for 16 h. The mixture was partitioned between ethyl acetate and sat. NaHCO3 (aq.) and the aqueous extracted with additional ethyl acetate. The combined organics were washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The crude 2-amino-5-[(S)-(+)-3-hydroxy-2-methylpropoxy]-N-(isopropylcarbamoylmethyl)benzamide (INTERMEDIATE VIII.1) was used directly in the next reaction. stirring continued at room temperature for 16 h The mixture was partitioned between ethyl acetate and sat. NaHCO3 (aq.) the aqueous extracted with additional ethyl acetate The combined organics were washed with brine dried (MgSO4) filtered concentrated in vacuo The crude 2-amino-5-[(S)-(+)-3-hydroxy-2-methylpropoxy]-N-(isopropylcarbamoylmethyl)benzamide (INTERMEDIATE VIII.1) was used directly in the next reaction

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

Procedure: A mixture of 2-amino-5-(3-piperidin-1-ylpropoxy)benzoic acid dihydrochloride (1.3 g, 3.7 mmol), 2-amino-N-isopropylacetamide*HCl (INTERMEDIATE I.1) (557 mg, 3.7 mmol) and triethylamine (2.1 mL, 14.8 mmol) in DMF (20 mL) was stirred at room temperature for 10 min. EDC (851 mg, 4.4 mmol) and HOBt (600 mg, 4.4 mmol) were added and stirring continued at room temperature for 16 h. The mixture was partitioned between ethyl acetate (100 mL) and 2N Na2CO3 (aq.) (100 mL) and the aqueous extracted with additional ethyl acetate (2×100 mL). The combined organics were washed with brine (1×100 mL), dried (MgSO4), filtered and concentrated in vacuo. The crude residue was purified by chromatography on silica gel with dichloromethane:methanol: NH4OH (aq.) (160:39:1, v/v) as eluent to provide 2-amino-N-(isopropylcarbamoylmethyl)-5-(3-piperidin-1-ylpropoxy)benzamide (INTERMEDIATE V1.1) (1.4 g, 3.7 mmol, 100%). stirring continued at room temperature for 16 h The mixture was partitioned between ethyl acetate (100 mL) and 2N Na2CO3 (aq.) (100 mL) the aqueous extracted with additional ethyl acetate (2×100 mL) The combined organics were washed with brine (1×100 mL) dried (MgSO4) filtered concentrated in vacuo The crude residue was purified by chromatography on silica gel with dichloromethane

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

Procedure: To a solution of 2-amino-N-isopropylacetamide (INTERMEDIATE I.1) (4.77 g, 41.1 mmol) in acetonitrile (50 mL) was added 6-hydroxy-1H-benzo[d][1,3]oxazine-2,4-dione (6.13 g, 34.2 mmol). The mixture was stirred for 16 h at room temperature during which time a very thick precipitate formed. The mixture was diluted with dichloromethane (100 mL) and the solid collected by filtration and washed with dichloromethane (2×20 mL) to afford 2-amino-5-hydroxy-N-(isopropylcarbamoylmethyl)benzamide (INTERMEDIATE II.1) (6.75 g, 32.0 mmol, 78%). formed the solid collected by filtration washed with dichloromethane (2×20 mL)

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In an open, 50 mL two-necked round bottom flask, a neat mixture of compound 3-(3-chlorophenyl)-7-methoxyisochromen-1-one (1.00 g, 3.49 mmol) and 2-amino-N-isopropylacetamide (INTERMEDIATE I.1) (2.02 g, 17.4 mmol, 5 eq) was heated to 120° C. under argon for 3 days, adding absolute EtOH in aliquots (2 mL) daily to loosen up the reaction mixture. The residue was purified by chromatography on silica gel with ethyl acetate:hexane (1:3, v/v) as eluent to give 2-[3-(3-chlorophenyl)-7-methoxy-1-oxo-1H-isoquinolin-2-yl]-N-isopropylacetamide (0.985 g, 2.56 mmol, 73%) as a white solid. The residue was purified by chromatography on silica gel with ethyl acetate:hexane (1:3