Sulfuric Acid → HCID 178492703, compound

Participants

Reaction Steps

A solution of the product of Example 31C (60 mg, 0.1 mmol) in concentrated sulfuric acid (3 mL) and water (0.5 mL) was stirred for 10 minutes at 0° C. and at 90° C. for 1.5 hours. The mixture was quenched with crushed ice and adjusted pH 9 with sodium bicarbonate solution. The precipitate was filtered off and the filtrate was extracted with 4/1 dichloromethane/methane (5×50 mL). The organic layers were collected, concentrated and purified by preparative HPLC using a gradient of 10/90 to 80/20 acetonitrile/water (containing 0.1% trifluoroacetic acid) to give the title compound. 1H NMR (DMSO-d6, 300 MHz): δ 12.2 (s, 1H), 9.59 (s, 1H), 9.38 (s, 1H), 8.58-8.62 (d, J=12 Hz, 2H), 7.88-7.92 (m, 2H), 7.59-7.62 (m, 2H), 7.39-7.47 (m, 2H), 7.06 (m, 2H), 4.75 (s, 2H), 3.89 (s, 3H), 3.58-3.60 (d, J=6 Hz, 2H), 3.25-3.27 (d, J=6 Hz, 2H), 3.88 (s, 6H). MS: 556 (M+H+).

Provenance & Evidence