Formic Acid → 4,7-Dihydroxy-3-(3-nitrobenzyl)-2-oxo-2H-1-benzopyran

Participants

Reaction Conditions

Reaction Steps

4,7-Dihydroxy-2-oxo-2H-1-benzopyran (500 mg, 2.81 mmol) and 3-nitrobenzaldehyde (424 mg, 2.81 mmol) were added to a mixture of triethylamine (1.57 mL, 11.23 mmol) and formic acid (1.07 mL, 28.07 mmol), and the obtained mixture was stirred at 100° C. for 2 hours. A 5N hydrochloric acid aqueous solution was added to the reaction mixture, and extraction was performed with ethyl acetate. The organic extract was washed with saturated saline and dried over magnesium sulfate, and then concentrated under reduced pressure to yield the title compound (300 mg, 34%) as a pale yellow solid.

Provenance & Evidence