Hydrochloric Acid → Ethyl 4-oxo-5-phenyl-4H-pyran-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of 4-dimethylamino-3-phenyl-3-buten-2-one (30.3 g) and diethyl oxalate (43.5 ml) in ethanol (75 ml) was added to a stirred solution of sodium ethoxide prepared by dissolving sodium (5.5 g) in ethanol (150 ml). The stirred mixture was heated under reflux for 1 hour, cooled to 20°-25° C. and acidified by addition of 5 N hydrochloric acid (150 ml). The mixture was stirred for a further hour, then cooled to 5° C., and diluted with water (300 ml). The solid title product was recrystallised from ethanol-water (mp 110°-112° C.).

Provenance & Evidence