Ethyl Acetate → 6-Bromo-8-cyclopropyl-2,2,4,4-tetramethyl chroman

Participants

Reaction Steps

A stirred, cooled (−30° C.) solution of 6-bromo-8-vinyl-2,2,4,4-tetramethyl chroman (Intermediate 31, 0.37 g, 1.26 mmol) in diethyl ether was treated with a solution of diazomethane in diethyl ether and catalytic amount of palladium (II)acetate (˜30 mg). The reaction mixture was allowed to warm to ambient temperature and subjected to flash column chromatography over silica gel (230-400 mesh) using 2% ethyl acetate in hexane as the eluent to afford the title compound as a clear, pale yellow oil (0.376 g, 97%).

Provenance & Evidence