反应详情

To a suspension of methyltriphenylphosphonium bromide (61.1 g, 1.2 equiv) in THF (350 ml) at 0 C was added potassium bis(trimethylsilyl)amide (260 ml of a 15% solution in toluene, 1.2 equiv) and this mixture was stirred at 0 C for 15 min and at r.t. for 45 min. Then, a solution of the ketoester 16 (33.7 g, 141 mmol) in THF (70 ml) was added at 0 C and stirring was continued at r.t. for 1 h. The reaction was quenched by addition of a saturated solution of NH4Cl and ice. The product was extracted into i-PrOAc and the organics were dried over Na2SO4 and filtered through small pad of silica. Purification of the residue by filtration through a plug of silica (1.5 L) with EtOAc/hexane 10 and 15% yielded 26.92 g (81%) of 17 as a colorless oil.

1. stirringstirring
2. waitwas continued at r.t. for 1 h
3. customThe reaction was quenched by addition of a saturated solution of NH4Cl and ice
4. extractionThe product was extracted into i-PrOAc
5. dry with materialthe organics were dried over Na2SO4
6. filtrationfiltered through small pad of silica
7. customPurification of the residue
8. filtrationby filtration through a plug of silica (1.5 L) with EtOAc/hexane 10 and 15%