Sulfuric Acid → HCID 66699096, compound

Participants

Reaction Steps

A mixture of Step 6 intermediate (1.0 g, 3.755 mmol) and 6 N H2SO4 (9.3 ml) in dioxane (9.3 ml) stirred at reflux temperature for 2 h to give a homogeneous pale yellow solution. This solution was cooled, diluted with water and extracted with ethyl acetate (2×50 ml). The combined organic layers were washed with water, dried over Na2SO4 and concentrated. The residue obtained was triturated in diethyl ether, solid obtained was collected by filtration to give 330 mg of the product as a white solid; 1H NMR (300 MHz, DMSO-d6): δ 3.17 (s, 3H), 3.34 (s, overlapping with DMSO, 3H), 3.79 (s, 3H), 4.11 (s, 2H), 12.95 (br s, 1H) and 1H NMR (300 MHz, CDCl3): δ 3.39 (s, 3H), 3.50 (s, 3H), 3.88 (s, 3H), 4.10 (s, 2H).

Provenance & Evidence