Piperidine → 5-acetyl-3-(1H-indol-2-ylmethylene)-1,3-dihydro-indol-2-one

Participants

Reaction Steps

A mixture of 5-acetyl-2-oxindole (88 mg), indole-2-carbaldehyde (87 mg) and piperidine (4 mg) in ethanol (2 mL) was held in a sealed tube at 90° C. for 3 hours. The mixture was cooled to room temperature. The solid which formed was collected by vacuum filtration, washed with cold ethanol and dried in a vacuum oven to give 133 mg (88% yield) of 5-acetyl-3-(1H-indol-2-ylmethylene)-1,3-dihydro-indol-2-one as an orange solid.

Provenance & Evidence