反应详情

2.3 g (5 mmol) of the compound of Example IV are stirred in 5 ml of dichloromethane and 5 ml of trifluoroacetic acid for 5 hours at 25° C. After concentration, the crude product is chromatographed over silica gel 60 using dichloromethane/methanol (100:5). Yield: 1.8 g (87.6% of theory)

1. concentrationAfter concentration
2. customthe crude product is chromatographed over silica gel 60 using dichloromethane/methanol (100:5)