反应详情

To a solution of (S)-3-cyclohexylprop-1-yn-3-ol, (obtained according to Preparation 10) (2.76 g, 0.02 mol), in 10 ml N,N-dimethylformamide (DMF), cooled to 0° C., was added imidazole (2.1 g), followed by tert-butyldimethylchlorosilane (3.1 g, 0.02 mol). The mixture was stirred for 3 h. Water (80 ml) and hexane (80 ml) were added; the organic layer was separated and combined with 2×80 ml of hexane extractions of the aqueous layer. The solvent was removed (in vacuo), after drying over sodium sulfate, to give a crude residue (4.3 g) which was chromatographed on silica gel (80 g), eluting with ethyl acetate-hexane (2:1, v/v) to afford (S)-3-tert-butyldimethylsilyloxy-3-cyclohexylprop-1-yne.

1. customthe organic layer was separated
2. extractioncombined with 2×80 ml of hexane extractions of the aqueous layer
3. customThe solvent was removed (in vacuo)
4. dry with materialafter drying over sodium sulfate
5. customto give a crude residue (4.3 g) which
6. customwas chromatographed on silica gel (80 g)
7. washeluting with ethyl acetate-hexane (2:1, v/v)