3-Iodo-8-methoxy-2-phenyl-pyrano[2,3-c]pyridin-4-one → 3-iodo-2-phenyl-7H-pyrano[2,3-c]pyridine-4,8-dione

Participants

Reaction Conditions

Reaction Steps

A suspension of 3-iodo-8-methoxy-2-phenyl-pyrano[2,3-c]pyridin-4-one (0.30 g, 0.791 mmol) in 33% hydrogen bromide solution in AcOH (3 mL) was heated in a microwave oven at 60° C. for 40 minutes. After coiling to RT, the reaction mixture was added to rapidly stirred ice-cold water (30 mL). After stirring for 10 min, the solid was collected by filtration, washed with water and dried in vacuo at 50° C. to give the title compound (0.28 g, 97%) as a white solid. LCMS (Method A): RT=3.74 min, [M+H]+=366.

Provenance & Evidence