Potassium bis(trimethylsilyl)amide → Ethyl 2-(2,6-dimethoxyphenyl)acrylate

Beteiligte Stoffe

Reaktionsschritte

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.

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