反应详情

(2S,4R)-tert-Butyl 4-hydroxy-2-(hydroxymethyl)pyrrolidine-1-carboxylate (500 mg, 2.3 mmol) in pyridine (20 mL) was cooled to 0° C. and treated with a solution of p-toluenesulfonyl chloride (483 mg, 2.53 mmol) in pyridine (5 mL) added over a period of 1 hour. The reaction was allowed to slowly warm to ambient temperature with continued stirring for 48 hours. The resulting material was triturated with ethyl acetate and purified by flash chromatography on a 12 g silica gel column, eluting with 5% ethyl acetate/hexanes for 3 minutes followed by a gradient to 100% ethyl acetate over 20 minutes to afford the title compound as an oil (397 mg; 64%). 1H NMR (300 MHz, DMSO-d6) δ ppm 7.82-7.69 (m, 2H), 7.48 (d, J=7.9 Hz, 2H), 4.92 (d, J=2.8 Hz, 1H), 4.23-3.82 (m, 4H), 3.12 (dd, J=25.5, 13.9 Hz, 2H), 2.42 (d, J=3.6 Hz, 3H), 1.87 (d, J=20.3 Hz, 2H), 1.35 (dd, J=23.0, 13.0 Hz, 9H).

1. additionadded over a period of 1 hour
2. customThe resulting material was triturated with ethyl acetate
3. custompurified by flash chromatography on a 12 g silica gel column
4. washeluting with 5% ethyl acetate/hexanes for 3 minutes
5. waitfollowed by a gradient to 100% ethyl acetate over 20 minutes