Palladium-Catalyzed Asymmetric Allylic C–H Alkylation of 1,4-Dienes with Cyclic β-Keto Esters
作者:Lian-Feng Fan、Tian-Ci Wang、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/acs.organomet.9b00363
日期:2019.10.28
In the presence of chiral phosphoramidite ligand, a palladium-catalyzed asymmetric allylic C–H alkylation of 1,4-dienes with cyclic β-keto esters has been established to afford chiral α,α-disubstituted β-keto esters in good to excellent yields, with high levels of regioselectivity, E/Z selectivity, and enantioselectivity. 1,4-Dienes bearing a wide scope of functional groups, such as ketone, chloride
在存在手性亚磷酰胺配体的情况下,已经建立了钯与环式β-酮酯的1,4-二烯的钯不对称烯丙基C–H烷基化反应,从而以良好或优异的收率获得了手性α,α-二取代的β-酮酯。 ,具有很高的区域选择性,E / Z选择性和对映选择性。带有宽泛范围的官能团(例如酮,氯,酯和酰胺)的1,4-二烯已被很好地耐受。另外,该方法的初步应用使得(-)-tanikolide的简明形式合成成为可能。