反应详情

To a solution of 1G (62 mg, 0.2 mmol) in CH2Cl2 (1 mL) was added pyridine (0.049 mL, 0.6 mmol), followed by addition of benzoyl chloride (42 mg, 0.3 mmol). The resulting mixture was stirred at RT under argon for 6 h, then loaded on a silica gel cartridge (10 g), eluting with EtOAc (25-50%) in hexane to give the title compound as a white solid (72 mg, 88%). m.p. 174-175° C., HPLC: 99% at 3.01 min (retention time, Phenom. Luna C18, 4.6×50 mm elating with 10-90% MeOH/H2O over 4 minutes containing 0.1% TFA; 4 ml/min, monitoring at 220 inn). MS (ES): m/z=418 [M+1]+. Chiral HPLC 100% e.e.; retention time=34.8 min; Conditions: OD (4.6×250 mm); Eluted with 40% isopropanol in hexane at 1 mL/min.

1. washeluting with EtOAc (25-50%) in hexane