反应详情

To N-methyl bromomaleimide (100 mg, 0.53 mmol) and sodium acetate trihydrate (70 mg, 0.53 mmol) in methanol (15 mL) was added hexanethiol (74 μL, 0.58 mmol) in methanol (100 mL) dropwise over 1 hour with vigorous stirring. After 5 minutes solvent was removed in vacuo. Purification by column chromatography (gradient elution in 10% ethyl acetate in petroleum ether to 30% ethyl acetate in petroleum ether) afforded the desired compound as a bright yellow solid (99 mg, 0.44 mmol) in 83% yield. δH (600 MHz, CDCl3) 6.03 (s, 1H, H-2), 3.01 (s, 3H, H3-5), 2.89 (t, 2H, J=7.6, 2H, H2-11), 1.76-1.71 (m, 2H, H2-10), 1.46-1.41 (m, 2H, H2-9), 1.33-1.27 (m, 4H, H2-7 and CH2-8), 0.89 (t, 3H, J=6.5, H3-6); δC (125 MHz, CDCl3) 171.47 (C═O), 169.94 (C═O), 151.84 (C3), 117.27 (C2), 31.92 (C11), 31.31 (CH2), 28.64 (CH2), 27.75 (CH2), 24.10 (C5), 24.10 (C7), 14.09 (C6); IR (oil, cm−1) 2727 (w), 1708 (s); MS (FAB+) m/z (relative intensity): 250 ([M+Na], 40), 228 (35), 199 (30), 176 (100); Exact Mass Calcd for [C11H17NO2S]+Na requires m/z 250.0878 Found 250.0880 (FAB+).

1. customAfter 5 minutes solvent was removed in vacuo
2. customPurification
3. washby column chromatography (gradient elution in 10% ethyl acetate in petroleum ether to 30% ethyl acetate in petroleum ether)