methyl (2R)-2-aminopentanoate

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Thionyl chloride (47.7 mL) was added dropwise to methanol (300 mL) under stirring at −5° C. over 2 hours and 15 minutes. D-Norvaline (35.00 g) was added to the resulting light yellow solution under stirring at −4° C. The solution was stirred at room temperature for 18 hours and then methanol was removed under reduced pressure. Diisopropyl ether (90 mL) was added to the precipitated crystals, which were filtered and washed twice with diisopropyl ether (30 mL) to give (R)-norvaline methyl ester (47.74 g, 95% yield) as a white powder. under stirring at −4° C The solution was stirred at room temperature for 18 hours methanol was removed under reduced pressure Diisopropyl ether (90 mL) was added to the precipitated crystals, which were filtered washed twice with diisopropyl ether (30 mL)

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Thionyl chloride (47.7 mL) was added dropwise to methanol (300 mL) under stirring at −5° C. over 2 hours and 15 minutes. D-Norvaline (35.00 g) was added to the resulting light yellow solution under stirring at −4° C. The solution was stirred at room temperature for 18 hours and then methanol was removed under reduced pressure. Disopropyl ether (90 mL) was added to the precipitated crystals, which were filtered and washed twice with diisopropyl ether (30 mL) to give (R)-norvaline methyl ester (47.74 g, 95% yield) as a white powder. under stirring at −4° C The solution was stirred at room temperature for 18 hours methanol was removed under reduced pressure Disopropyl ether (90 mL) was added to the precipitated crystals, which were filtered washed twice with diisopropyl ether (30 mL)