methyl N-[2-(3-chlorophenyl)ethyl]carbamate

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

Procedure: Under N2 protection, a mixture of [2-(3-chloro-phenyl)-ethyl]-carbamic acid methyl ester (5.0 g, 23.4 mmol) and PPA (polyphosphoric acid) (20 g) in a 250 mL round-bottom flask was vigorously stirred at 120° C. for 2 hours. After cooling to room temperature, the reaction mixture was treated with ice-water and aqueous ammonia solution to adjust the pH to 8. Then, the mixture was then extracted with EtOAc, and the organic layer was washed with brine, dried over anhy. Na2SO4 and filtered. After removal of solvent under reduced pressure, the crude product obtained was further washed with ethyl ether to give title compound (1.66 g, 39%) as a white solid. MS: 182.0 (M+H+). After cooling to room temperature Then, the mixture was then extracted with EtOAc the organic layer was washed with brine dried over anhy Na2SO4 and filtered After removal of solvent under reduced pressure the crude product obtained was further washed with ethyl ether

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

Procedure: Under N2 protection, a mixture of [2-(3-chloro-phenyl)-ethyl]-carbamic acid methyl ester (5.0 g, 23.4 mmol) and PPA (polyphosphoric acid) (20 g) in a 250 mL round-bottom flask was vigorously stirred at 120° C. for 2 hours. After cooling to room temperature, the reaction mixture was treated with ice-water and aqueous ammonia solution to adjust the pH to 8. Then, the mixture was then extracted with EtOAc, and the organic layer was washed with brine, dried over anhy. Na2SO4 and filtered. After removal of solvent under reduced pressure, the crude product obtained was further washed with ethyl ether to give title compound (1.66 g, 39%) as a white solid. MS: 182.0 (M+H+). After cooling to room temperature Then, the mixture was then extracted with EtOAc the organic layer was washed with brine dried over anhy Na2SO4 and filtered After removal of solvent under reduced pressure the crude product obtained was further washed with ethyl ether

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

Procedure: At 0, methyl chloroformate (4.6 g, 48 mmol) was added dropwise to a solution of 2-(3-chloro-phenyl)-ethylamine (5.0 g, 32 mmol) and Et3N (6.4 g, 64 mmol) in DCM (100 mL). After the addition, the mixture was stirred at room temperature for 0.5 hour. The organic layer was washed with water (3×30 mL), 1N HCl (20 mL) and brine (30 mL), dried over anhy. Na2SO4, filtered and concentrated in vacuo. After vacuum drying, the title compound was obtained (6.49 g, 95%) as a white solid. MS: 214.1 (M+H+). After the addition The organic layer was washed with water (3×30 mL), 1N HCl (20 mL) and brine (30 mL) dried over anhy Na2SO4, filtered concentrated in vacuo After vacuum drying

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

Procedure: At 0, methyl chloroformate (4.6 g, 48 mmol) was added dropwise to a solution of 2-(3-chloro-phenyl)-ethylamine (5.0 g, 32 mmol) and Et3N (6.4 g, 64 mmol) in DCM (100 mL). After the addition, the mixture was stirred at room temperature for 0.5 hour. The organic layer was washed with water (3×30 mL), 1N HCl (20 mL) and brine (30 mL), dried over anhy. Na2SO4, filtered and concentrated in vacuo. After vacuum drying, the title compound was obtained (6.49 g, 95%) as a white solid. MS: 214.1 (M+H+). After the addition The organic layer was washed with water (3×30 mL), 1N HCl (20 mL) and brine (30 mL) dried over anhy Na2SO4, filtered concentrated in vacuo After vacuum drying