反应详情

To a stirred solution of the product of step 1 (12.3 g, 35.6 mmol) in methylene chloride (200 mL) was added 2-nitrobenzenesulfonyl chloride (9.00 g, 40.6 mmol) followed by triethylamine (6.4 mL, 46 mmol). After 30 minutes the reaction was concentrated and the residue partitioned between ethyl acetate and aqueous sodium 5 bicarbonate solution. The organic layer was dried (sodium sulfate) and concentrated. The resulting amber foam was purified by flash chromatography over silica (hexane/ethyl acetate) to afford 14.0 g (74%) of product as a colorless foam: 1H NMR (CDCl3) δ 7.95-7.87 (m, 1H), 7.76-7.62 (m, 3H), 7.35-7.15 (m, 10H), 7.06-6.94 (m, 3H), 6.90-6.83 (m, 2H), 6.42 (t, J=5.6, 1H), 5.80 (d, J=5.8, 1H), 4.12 (t, J=8.1, 1H), 4.01-3.82 (m, 3H), 3.18-3.08 (m, 1H), 2.68-3.57 (m, 1H) ppm.

1. concentrationAfter 30 minutes the reaction was concentrated
2. customthe residue partitioned between ethyl acetate and aqueous sodium 5 bicarbonate solution
3. dry with materialThe organic layer was dried (sodium sulfate)
4. concentrationconcentrated
5. customThe resulting amber foam was purified by flash chromatography over silica (hexane/ethyl acetate)