反应详情

A solution of ethyl 2-(tert-butoxycarbonylamino)-3-(3'-tetrahydropyranyloxyphenyl)-3-butenoate (0.40 g) in dimethoxyethane (10 ml) and water (2 ml) is treated with solid lithium hydroxide monohydrate (0.02 g). After stirring for 2 hours at room temperature, the mixture is diluted with water and acidified with 0.1 N hydrochloric acid to ca pH 4. Extraction with ether gives essentially pure racemic 2-(tert-butoxycarbonylamino)-3-(3'-tetrahydropyranyloxyphenyl)-3-butenoic acid (0.25 g): colorless solid.

1. extractionExtraction with ether