Triethylamine → 7-cyano-1-phenoxycarbonyloxy-6-trifluoromethylquinoxaline-2,3-(1H,4H)-dione

Participants

Reaction Conditions

Reaction Steps

A solution of 0.4 g (1.48 mmol) 7-cyano-1-hydroxy-6-trifluoromethylquinoxaline -2,3(1H,4H)-dione in 50 ml dry tetrahydrofuran was added 0.225 ml (1.63 mmol) dry triethylamine and 0.2 ml (1.58 mmol) phenyl chloroformate. The mixture was stirred at 25° C. for 30 min., and then filtered and evaporated in vacuo. The residue was stirred with ether to give 0.48 g (83%) of 7-cyano-1-phenoxycarbonyloxy-6-trifluoromethylquinoxaline-2,3-(1H,4H)-dione. M.p. 190° C. decomp. 1H-NMR (DMSO-d6): 8.43 (1H,s), 7.63 (1H, s), 7.3 (5H, broad s).

Provenance & Evidence