1,1'-Carbonyldiimidazole → 6-Chloro-3-(5-bromo-3-furoyl)-2-oxindole-1-carboxamide

Participants

Reaction Steps

The experimental procedure used to produce the title compound was adopted from Example 55. A 750 mg (3.93 mmole) portion of 5-bromo-3-furoic acid (prepared according to Amaral, L., et al., J.O.C., 41, 2350 (1976)) was transformed into the acyl imidazole by reaction with 690 mg (4.25 mmole) of 1,1'-carbonyldiimidazole. The intermediate 5-bromo-3-furan-(1-imidazo)carboxamide coupled directly with 689 mg (3.27 mmole) of 6-chloro-2-oxindole-1-carboxamide in the presence of 1.08 g (8.83 mmole) of 4-(N,N-dimethylamino)pyridine to give 500 mg (40% yield) of crude greenish-yellow solid. Recrystallization gave 143 mg (0.37 mmole, 11% yield) of pure title compound as a greenish solid, m.p. 232°-4° C. (acetic acid).

Provenance & Evidence