反应详情

Acetyl chloride (0.054 mL, 0.76 mmol) was added dropwise into the solution of (E)-2-methoxy-5-((2,4,6-trimethoxystyrylsulfonyl)methyl)pyridin-3-amine (80 mg, 0.21 mmol) in dry pyridine (5 mL) on an ice bath. The mixture was warmed to room temperature and stirred overnight. After evaporated to dryness, the residue was purified by silica gel chromatography, eluting with PE/EtOAc (1:3 v/v) to afford pure product as a white solid (38 mg, 44%). 1H-NMR (CDCl3-d6): δ 2.21 (s, 3H, CH3), 3.86 (s, 6H, 2×OCH3), 3.87 (s, 3H, OCH3), 4.03 (s, 3H, OCH3), 4.21 (s, 2H, CH2), 6.11 (s, 2H, Ph-H), 7.13 (d, 1H, J=15.6 Hz, CH), 7.61 (s, 1H, NH), 7.88 (d, 1H, J=15.6 Hz, CH), 7.89 (d, 1H, J=2.0 Hz, Py-H), 8.65 (d, 1H, J=2.0 Hz, Py-H); HR-MS (ESI+) m/z 437.1460 [M+H]+ C20H24N2O7S requires 436.1304,

1. customAfter evaporated to dryness
2. customthe residue was purified by silica gel chromatography
3. washeluting with PE/EtOAc (1:3 v/v)