A New Synthesis of Triphenylphosphorane Ylide Precursors to α-Keto Amide/Ester and Tricarbonyl Units via Horner-Wadsworth-Emmons Reaction
作者:Kie-Seung Lee
DOI:10.5012/bkcs.2010.31.10.2776
日期:2010.10.20
compounds under mild reaction conditions to afford β,γ-unsaturated α-keto triphenylphorane ylides in good to excellent yields, which were hydrogenated over Pd-C (10%)/H 2 (1 atm) to give the corresponding α-keto triphenylphorane ylides in quasi-quantitative yields. These triphenyphosphorane ylides have been utilized as the precursors to α-keto amide/ester and vicinal tricarbonyl units in Wasserman's synthetic
新开发的 Homer-Wadsworth-Emmons (HWE) 试剂 5 具有三苯基正膦叶立德亚基,在温和的反应条件下易于与各种羰基化合物缩合,以良好至极好的收率提供 β,γ-不饱和 α-酮基三苯基佛兰叶立德,在 Pd- 上氢化C (10%)/H 2 (1 atm) 以准定量产率得到相应的 α-酮基三苯基佛兰叶立德。在 Wasserman 的合成方案中,这些三苯基正膦叶立德已被用作 α-酮酰胺/酯和连位三羰基单元的前体,并且以前仅由羧酸/酰氯制备。