反应详情

To bromomaleimide (30 mg, 0.17 mmol) and sodium acetate (14 mg, 0.17 mmol) in methanol (6 mL) was added 1,2-ethanedithiol (17 μl 0.17 mmol). After five minutes solvent removed in vacuo and purification by flash chromatography (10% ethyl acetate in petroleum ether) afforded the desired compound as a pale yellow powder (13 mg, 0.07 mmol) in 41% yield. δH (500 MHz, CDCl3) 8.39 (s, 1H, NH), 3.75-3.69 (m, 2H, HH-2 and HH-3), 3.60-3.53 (m, 2H, HH-2 and HH-3), 3.30 (s, 2H, H2-9); δc (125 MHz, CDCl3) 177.93 (C═O), 172.76 (C═O), 61.23 (C5), 43.12 (C9), 41.05 (C2 and C3); IR (solid, cm−1) 3290 (m), 1703 (m), 1629 (s); MS (ES−) m/z (relative intensity): 188 ([M−H], 100); Exact Mass Calcd for [C6H7NO2S2]−H requires m/z 187.9840 Found 187.9839 (ES−); m.p. 112-115° C.

1. customAfter five minutes solvent removed in vacuo and purification by flash chromatography (10% ethyl acetate in petroleum ether)