反应详情

温度

0 °C

To a solution of 278 mg (0.75 mmol) of 1,4-dimethyl-6-hexadecyl-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine in 4 mL of chloroform was added 108 mg (0.38 mmol) of 1,3-dibromo-5,5-dimethylhydantoin in portions at 0° C. The reaction mixture was stirred at 0° C. for 30 min. The reaction was quenched by the addition of 5 mL of sat aq NaHCO3. The mixture was extracted with chloroform and the combined organic layer was washed with brine and dried over MgSO4. The concentrated residue was purified by flash chromatography on a silica gel column (20 1.7 cm). Elution with 100:1 hexanes/ethyl acetate gave the product as a white solid: yield 331 mg (98%); nip 49-50° C.; silica gel TLC Rf 0.78 (8:1:1 hexanes/ethyl acetate/methanol); 1H NMR (CDCl3) δ 0.88 (t, 3H, J=7.2 Hz), 1.25-1.31 (m, 28H), 1.66 (quint, 2H, J=7.6 Hz), 2.08 (s, 3H), 2.55 (t, 2H, j=8.0 Hz), 2.80 (t, 2H, J=8.4 Hz), 2.90 (s, 3H), 3.38 (t, 2H, J=8.0 Hz) and 6.13 (s, 1H); 13C NMR (CDCl3), δ 14.1, 19.5, 22.7, 25.2, 28.7, 29.4, 29.57, 29.61, 29.65, 29.68, 29.71, 29.71, 29.71, 29.71, 29.71, 29.71, 31.9, 33.0, 38.1, 52.4, 110.9, 120.3, 141.1, 156.8 and 161.8; mass spectrum, m/z 451.3 and 453.2 (M+H)+ (theoretical 451.3 and 453.3); mass spectrum (APCI), m/z 451.2680 and 453.2697 (M+H)+ (C25H44N2Br requires 451.2688 and 453.2667).

1. customThe reaction was quenched by the addition of 5 mL of sat aq NaHCO3
2. extractionThe mixture was extracted with chloroform
3. washthe combined organic layer was washed with brine
4. dry with materialdried over MgSO4
5. customThe concentrated residue was purified by flash chromatography on a silica gel column (20 1.7 cm)
6. washElution with 100:1 hexanes/ethyl acetate