m-Chloroperbenzoic acid → HCID 68432696, compound

Participants

Reaction Steps

5-Ethenyl-4-(2-hydroxyethyl)-2-benzofuran-1(3H)-one (1.2 g, 5.9 mmol) was added to a flask containing a stir bar. To the flask was then added dichloromethane (20 mL). The flask was placed in a cool bath of 0° C.; to the flask was poured mCPBA (1.5 g, 8.8 mmol) and the resulting mixture was stirred at room temperature for overnight; LC as well as TLC (hexanes/EtOAc=1/1) indicated that reaction had gone to completion. The solution was treated with dichloromethane and washed with NaHCO3, Na2S2O3, and water, the organic layer was then dried over Na2SO4, filtered and concentrated to dryness, it was then treated with AcOH (20 mL) and stirred overnight; LC indicated formation of cyclized product. The solvent was removed and the resulting residue was absorbed into silica gel and 6-(hydroxymethyl)-8,9-dihydro-1H-furo[3,4-f]isochromen-3(6H)-one was isolated with the solvent systems of hexanes/EtOAc (1/1). 1H-NMR (400 MHz, CDCl3) δ ppm 7.807 (d, J=8 Hz, 1H), 7.337 (d, J=8 Hz, 1H), 5.279 (s, 2H), 4.985 (s, 1H), 4.302-4.302 (m, 1H), 4.183-4.084 (m, 2H), 3.954-3.912 (m, 2H), 3.006-2.944 (m, 1H), 2.717-2.686 (m, 1H), 2.179-2.172 (m, 2H)

Provenance & Evidence