反应详情

To a solution of 3,4,5-trimethoxybenzenesulfonyl chloride (500 mg, 1.88 mmol) in methanol (10 mL) was added 3-hydroxy4-methoxyaniline (523 mg, 3.76 mmol) at ambient temperature. After stirring for 1 h, the reaction mixture was concentrated and the crude residue was purified by chromatography over silica to afford 430 mg (62%) of product as fme white needles, m.p. 145-146° C. 1H—NMR (CDCl3): δ9.74 (1H, s), 9.15 (1H, s), 6.98 (2H, s), 6.78 (1H, d, J=8.8 Hz), 6.63 (1H, d, J=2.6 Hz), 6.50 (1H, dd, J=8.8, 2.6 Hz), 3.76 (6H, s), 3.70 (3H, s), 3.68 (3H, s). Anal. Calcd. for C16H19N1O7S: C, 52.03; H, 5.18; N, 3.79; S, 8.68. Found: C, 51.87; H, 5.28; N, 3.76; S, 8.77.

1. concentrationthe reaction mixture was concentrated
2. customthe crude residue was purified by chromatography over silica