反应详情

A solution of tert-butyl (3R)-6-cyclohexyl-3-{3-[(2-ethoxy-1-methyl-2-oxoethoxy)methyl]-1,2,4-oxadiazol-5-yl}hexanoate (Preparation 88) (480 mg, 1.06 mmol) in dichloromethane (8 ml) was treated with trifluoroacetic acid (3.5 ml) and stirred at room temperature for 5 hours. The solvent was removed under reduced pressure and the residue azeotroped from toluene and dichloromethane. The oil was purified by column chromatography on silica gel eluting with a gradient system of 100:0:0 (dichloromethane:methanol:acetic acid) gradually changing to 95:5:0.5 (dichloromethane:methanol:acetic acid) to afford the title compound as a colourless oil (395 mg).

1. customThe solvent was removed under reduced pressure
2. customthe residue azeotroped from toluene and dichloromethane
3. customThe oil was purified by column chromatography on silica gel eluting with a gradient system of 100:0:0 (dichloromethane:methanol:acetic acid)