反应详情

To a solution of 1.25 g (8.76 mmol) of orcinol monohydrate and 2.50 g (8.76 mmol) of 5-bromo-2-methoxybenzenesulfonyl chloride in 25 mL of diethyl ether was added 25 mL of saturated aqueous NaHCO3 and the biphasic mixture stirred vigorously at ambient temperature for 3 days. The layers were separated and the aqueous layer extracted with 2×30 mL of ethyl acetate. The combined organic layers were washed with 50 mL of brine, dried (Na2SO4) and concentrated to 1.92 g (59%) of the desired product as a pale yellow crystalline solid: 1H-NMR (300 MHz; CDCl3) δ 7.93 (d, 1 H, J=2.5 Hz), 7.69 (dd, 1 H, J=8.9, 2.5 Hz), 6.98 (d, 1 H, J=8.9 Hz), 6.54 (br s, 1 H), 6.51 (br s, 1 H), 6.41 (t, 1 H, J=2.2 Hz), 3.98 (s, 3 H) and 2.24 (s, 3 H).

1. customThe layers were separated
2. extractionthe aqueous layer extracted with 2×30 mL of ethyl acetate
3. washThe combined organic layers were washed with 50 mL of brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated to 1.92 g (59%) of the desired product as a pale yellow crystalline solid