Boron tribromide → HCID 13091179, compound

Participants

Reaction Steps

Boron tribromide (3.0 ml) was added dropwise to a stirred solution of ethyl 5-(2-methoxyphenyl)-4-oxo-4H-pyran-2-carboxylate (3.2 g) in methylene chloride (100 ml) at 5°-10° C. The mixture was stirred for 2 hours at room temperature, then cooled to 5° C. and carefully diluted with water (50 ml). The solid title product was recrystallised from ethanol (mp 187°-189° C.).

Provenance & Evidence