Sulfuric Acid → HCID 178508292, compound

Participants

Reaction Steps

To a stirred solution of Step 1 intermediate (1.1 g, 3.829 mmol) in a mixture of methanol (20 ml) and water (20 ml) was added conc. H2SO4 (2 ml) and the resulting mixture was refluxed for 24 h. The reaction mixture was cooled to room temperature, saturated solution of potassium carbonate was added and extracted with ethyl acetate (2×50 ml). The organic layers were combined and dried over Na2SO4 and filtered. The filtrate was concentrated under reduced pressure. The residue obtained after the evaporation of the solvent was purified by silica gel column chromatography using 5% methanol in chloroform to obtain 290 mg of the product as a yellow solid; 1H NMR (300 MHz, DMSO-d6): δ 5.55 (br s, 2H), 7.32 (s, 1H), 7.59-7.67 (m, 3H), 11.30 (br s, 1H).

Provenance & Evidence