反应详情

To 3-butenylamine hydrochloride (200 mg, 1.12 mmol) and sodium acetate (184 mg, 2.24 mmol) in methanol (15 mL) was added bromomaleimide (200 mg, 1.12 mmol) dropwise in methanol (15 mL). After 10 minutes, solvent was removed in vacuo and purification by flash chromatography (10% ethyl acetate in petroleum ether) afforded the desired compound as a bright yellow waxy solid (142 mg, 0.85 mmol) in 76% yield. δH (500 MHz, CDCl3) 7.10 (s, 1H, NH), 5.77 (tdd, 1H, J=6.9, 10.7 and 17.4, H-2), 5.38 (s, 1H, NH), 5.18-5.15 (m, 2H, H2-1), 4.83 (d, 1H, J=1.3, H-6), 3.24 (t, 2H, J=6.7, H2-4), 2.40 (dtd, 2H, J=1.2, 6.8 and 6.9, H2-3); δC (125 MHz, CDCl3) 171.94 (C═O), 167.45 (C═O), 149.53 (C5), 133.89 (C2), 118.51 (C1), 85.80 (C6), 43.30 (C4), 32.68 (C3); IR (solid, cm−1) 3290 (m), 1703 (m), 1629 (s); MS (ES−) m/z (relative intensity): 165 ([M−H], 100); Exact Mass Calcd for [C8H10N2O2]−H requires m/z 165.0659 Found 165.0664 (ES−); m.p. 68-76° C.; UV (Acetonitrile) ε241=8300 and ε348=6100 cm−1M−1 d3.

1. customsolvent was removed in vacuo and purification by flash chromatography (10% ethyl acetate in petroleum ether)