反応 #84044

反応方程式

HCl

methyl chloroformate

(R)-2-amino-2-phenylacetic acid

LiOH

→

(R)-2-(methoxycarbonylamino)-2-phenylacetic acid

収率 65.8%

溶媒

water

反応条件

後処理

1. 1
   workup.STIRRINGthe mixture was stirred for 2 hours at 0° C
2. 2
   抽出The mixture was extracted with EtOAc
3. 3
   濃縮the organic phase was concentrated in vacuum
4. 4
   その他The residue was dried overnight in vacuum

実験手順

To a solution of (R)-2-amino-2-phenylacetic acid (14 g, 92.6 mmol) in water (250 mL) was added LiOH (14.8 g, 618.7 mmol) at 0° C. and the mixture was stirred for 15 minutes. To this solution, methyl chloroformate (17.9 mL, 231.5 mmol) was added drop wise and the mixture was stirred for 2 hours at 0° C. The mixture was then acidified until pH 1 with concentrated HCl. The mixture was extracted with EtOAc and the organic phase was concentrated in vacuum. The residue was dried overnight in vacuum, resulting in (R)-2-(methoxycarbonylamino)-2-phenylacetic acid (11.8 g; 60.9 mmol).

出典