反应详情

A mixture of 7-(benzyloxy)-5-[4-(methylsulfonyl)phenoxy]-1H-indole-2-carboxylic acid (1.59 g), 1-[3-(dimethylamino)propyl-3-ethylcarbodiimide hydrochloride (1.4 g), 1-hydroxybenzotriazole ammonium salt (1.1 g) and N,N-dimethylformamide (40 mL) was stirred at room temperature for 16 hr. Water was added to the reaction solution, and the precipitated solid was collected by filtration, and washed successively with water, ethanol and diethyl ether to give the title compound (1.6 g, yield 100%) as a pale-yellow solid. The pale-yellow solid was recrystallized from N,N-dimethylformamide-water to give pale-yellow crystals. melting point 251-252° C.

1. filtrationthe precipitated solid was collected by filtration
2. washwashed successively with water, ethanol and diethyl ether