methyl (2S)-3-hydroxy-2-(methoxycarbonylamino)propanoate

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720s, br. (C=O), 1535 s (amnide II). MS (El): 178/20 (M+H+). After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720s, br. (C=O), 1535 s (amnide II). MS (El): 178/20 (M+H+). After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720s, br. (C=O), 1535 s (amnide II). MS (El): 178/20 (M+H+). After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720 s, br. (C=O), 1535 s (amide II). MS (El): 178/20 (M+H+). After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720 s, br. (C=O), 1535 s (amide II). MS (El): 178/20 (M+H+). After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chioroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720s, br. (C═O), 1535s (amide II). MS (EI): 178/20 (M+H+). After 2½ h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated

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

Procedure: To a solution of 72.03 g L-serine-methylester hydrochloride in 400 ml of water were added at 0° C. 49.5 g of methyl chloroformate. The pH was kept at 6-7 by adding a 40% aqueous solution of sodium hydroxide. After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate, the combined extracts were dried and evaporated to give 75.39 g (92%) of pure methyl 3-hydroxy-(S)-2-methoxycarbonylamino-propionate. IR (neat): 3380 m (NH, OH), 1720s, br. (C=O), 1535 s (amnide II). MS (El): 178/20 (M+H+). After 2 1/2 h at 0° C. the mixture was extracted with 6 portions of ethyl acetate the combined extracts were dried evaporated