Nitric Acid → 2-chloro-5-nitro-1H-indole-3-carbaldehyde

Participants

Reaction Steps

15 g of (1) was added to a mixture of 150 ml acetic acid and 150 ml of acetic anhydride at 0°. 3.5 ml of 100% HNO3 was slowly added, and after 1 hour another 3.5 ml of 100% HNO3 was added. Stirring was continued for 1 hour at 0° C. The mixture was then added to ice, left in the cold overnight, and filtered to give 10 g of (65), which was used without further purification.

Provenance & Evidence