反应详情

A solution of 4-(1-acetyl-5-aminoindol-3-ylmethyl)-3-methoxybenzoic acid (Z) (0.31 g.), cyclopentylacetic acid (0.117 g.), 4-(dimethylamino)pyridine (0.233 g.) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.35 g.) in dichloromethane (20 ml.), under a nitrogen atmosphere, was stirred at ambient temperature for two hours. The mixture was acidified with hydrochloric acid (1N, 30 ml.), extracted with ethyl acetate (3×50 ml.), and the combined extracts dried (MgSO4) and evaporated. The residual oil was purified by flash chromatography on silica gel (100 ml.), eluting with 50:45:5 v/v/v hexane:dichloromethane:ethyl acetate, to give a product which was recrystallized from a mixture of tetrahydrofuran and ether, and then from a mixture of ethanol and water, to give the title compound (0.055 g., 14%), as a white solid, m.p. 245°-247° C.

1. extractionextracted with ethyl acetate (3×50 ml.)
2. dry with materialthe combined extracts dried (MgSO4)
3. customevaporated
4. customThe residual oil was purified by flash chromatography on silica gel (100 ml.)
5. washeluting with 50:45:5 v/v/v hexane
6. customdichloromethane:ethyl acetate, to give a product which
7. customwas recrystallized from a mixture of tetrahydrofuran and ether
8. additionfrom a mixture of ethanol and water