Formic Acid → N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-formamide

Participants

Reaction Steps

A solution of acetic anhydride (1.6 ml) and formic acid (1.2 ml) was stirred for 1 hour at room temperature, and added with 5-amino-1,3-dihydro-indol-2-one (3.56 g, 24 mmol, prepared according to U.S. Pat. No. 6,114,371) in 60 ml of tetrahydrofuran and piperidine (0.04 ml). The resulting mixture was stirred for 3 hours at room temperature until a precipitate was formed. The solid was filtered and recrystallized from methanol to give N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-formamide (3.6 g, 85%) as a white solid.

Provenance & Evidence