反应详情

300 mg of tert-butyl 2-{(1R,3S)-3-[5-ethyl-2-(3-methoxyphenyl)oxazol-4-ylmethoxy]-cyclohexylmethoxy}-2-methylpropionate are left to stand in 1 ml of trifluoroacetic acid at RT overnight. The solution is completely evaporated, water is added to the residue, and the pH is adjusted to 3 with sodium bicarbonate solution. The solution is extracted with ethyl acetate, and the organic phase is washed twice with water, dried over magnesium sulfate and concentrated. The residue is chromatographed on silica gel (dichloromethane/methanol gradient), resulting in 256 mg of 2-{(1R,3S)-3-[5-ethyl-2-(3-methoxyphenyl)oxazol-4-ylmethoxy]cyclohexylmethoxy}-2-methylpropionic acid as yellow resin.

1. customThe solution is completely evaporated
2. additionwater is added to the residue
3. extractionThe solution is extracted with ethyl acetate
4. washthe organic phase is washed twice with water
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated
7. customThe residue is chromatographed on silica gel (dichloromethane/methanol gradient)
8. customresulting in 256 mg of 2-{(1R,3S)-3-[5-ethyl-2-(3-methoxyphenyl)oxazol-4-ylmethoxy]cyclohexylmethoxy}-2-methylpropionic acid as yellow resin