反应详情

温度

-5 °C

Preparation of 13′-O-tert-butyldimethylsilyl-Roridin A. 100 mg (1.47 mmol) of imidazole was added to a solution of 232 mg (0.436 mmol) of Roridin A in 3 ml of dry dimethylformamide. The mixture was cooled to −5° C. and then 72 mg (0.478 mmol) of tert-butyldimethylsilyl chloride (Aldrich Chemical Co.) was added. The resultant mixture was stirred at −5° C. to 5° C. for 4 hours and then concentrated. The residue was chromatographed on silica gel, eluting first with 30% ethyl acetate/hexane, next with 50% ethyl acetate/hexane and finally with 70% ethyl. acetate/hexane, to afford 137 mg of the product as a foamy white solid (49%): TLC-Rf 0.32 (30% ethyl acetate/hexane).

1. concentrationconcentrated
2. customThe residue was chromatographed on silica gel
3. washeluting first with 30% ethyl acetate/hexane, next with 50% ethyl acetate/hexane and finally with 70% ethyl