反应详情

N-(2-Mercapto-2-methylpropanoyl)-L-cysteine (11.2 g, 0.05 mol) is dissolved in N sodium hydroxide (50 ml) and pivaloyl chloride (17.0 g, 0.13 mol) and aqueous N sodium hydroxide (150 ml) are added dropwise at 0° C. with stirring under a nitrogen atmosphere. After the addition, the mixture is stirred for 1 hour at room temperature and acidified with 6 N hydrochloric acid. The produced oil is extracted with ethyl acetate and the organic layer is washed with water, dried and concentrated to dryness under reduced pressure to yield 3.2 g (16.4%) of S-pivaloyl-N-(S-pivaloyl-2-mercapto-2-methylpropanoyl)-L-cysteine.

1. additionare added dropwise at 0° C.
2. additionAfter the addition
3. stirringthe mixture is stirred for 1 hour at room temperature
4. extractionThe produced oil is extracted with ethyl acetate
5. washthe organic layer is washed with water
6. customdried
7. concentrationconcentrated to dryness under reduced pressure