Boron tribromide → HCID 13091182, compound

Participants

Reaction Steps

Boron tribromide (8.8 ml) was added dropwise to a stirred solution of ethyl 5-(4-methoxyphenoxy)-4-oxo-4H-pyran-2-carboxylate (4.35 g) in methylene chloride (50 ml) causing gentle reflux. The solution was heated under reflux for a further 2 hours, then cooled and carefully diluted with water (25 ml). The solid title product was recrystallised from water (mp 257°-258° C. with decomposition).

Provenance & Evidence