反应详情

Potassium tert butoxide (13.46 g, 0.120 mol) was added to methoxymethyl triphenyl phosphonium chloride (38.30 g, 0.112 mol) in 150 ml dry THF at −30° C. under argon atmosphere and stirred for 1 h. 4-trifluoromethylbenzaldehyde (15.0 g, 0.086 mol) in 60 ml THF was added dropwise at the same temperature and stirring continued for 3 h at room temperature. The reaction mixture was treated with 100 ml water, 150 ml petroleum ether and filtered through celite. Organic layer was separated and the aq. layer was extracted with petroleum ether (2×100 ml). Combined organic layer was washed with brine and dried over sodium sulfate. Solvent evaporation under reduced pressure followed by purification over silica gel using petroleum ether as eluent afforded (10.5 g) of the sub-title compound as a colorless liquid. This was directly taken for next step without further purification.

1. stirringstirring
2. waitcontinued for 3 h at room temperature
3. filtrationfiltered through celite
4. customOrganic layer was separated
5. extractionthe aq. layer was extracted with petroleum ether (2×100 ml)
6. washCombined organic layer was washed with brine
7. dry with materialdried over sodium sulfate
8. customSolvent evaporation under reduced pressure
9. customfollowed by purification over silica gel