Ethyl chloroformate → 5h-Pyrrolo[1,2-b]cinnolin-10-one

Participants

Reaction Steps

A solution of [2-(2-fluorobenzoyl)-1H-pyrrol-1-yl]carbamic acid, ethyl ester (60.0 g, prepared from 1-amino-2-(2-fluorobenzyl)pyrrole and ethyl chloroformate in substantially the same manner as in Example 3) in 250 ml of ethanol was treated with a solution of potassium hydroxide (51 g) in 150 ml of water and then the mixture was heated at reflux for 1 hour. The ethanol was evaporated and the aqueous layer washed with 3×500 ml of ether. The aqueous phase was then adjusted to pH 5 with 6N HCl and the product collected by filtation. Oven drying yielded 20 g of a yellow powder, mp>300° C.

Provenance & Evidence