Phosphorus oxychloride → Ethyl 4-chloro-6-(trifluoromethoxy)quinoline-3-carboxylate

Participants

Reaction Steps

6-Trifluoromethoxy-4-hydroxy-3-ethoxycarbonylquinoline (3 g, 10 mmol) and POCl3 (8 mL) were mixed together and the mixture was heated at reflux for 6 h. The excess POCl3 was removed under vacuum. The solid residue was suspended in ice-cold 1N NaOH and the mixture was stirred for 15 min. The solid was filtered off, washed several times with water and dried over P2O5 to give 6-trifluoromethoxy-4-chloro-3-ethoxycarbonylquinoline as an off-white solid.

Provenance & Evidence