2-ethoxy-9-methoxy-2,3-dihydro-7H-furo[3,2-g][1]benzopyran-7-one → 8-Methoxypsoralen

Participants

Reaction Steps

A solution of 100 mg. (0.38 mmole) of 2-ethoxy-9-methoxy-2,3-dihydro-7H-furo[3,2-g][1]benzopyran-7-one in 2 ml. of formic acid was heated at 100° for 30 min. The reaction was cooled and evaporated to leave a residue which was filtered through alumina using benzene/ethyl acetate, 4:1 to yield, upon evaporation of the filtrate, pure 9-methoxy-7H-furo[3,2-g][1]benzopyran-7-one, mp 145°-146°.

Provenance & Evidence