Palladium-Catalyzed Asymmetric Allylic Alkylation of 2-Acylimidazoles as Ester Enolate Equivalents
作者:Barry M. Trost、Konrad Lehr、David J. Michaelis、Jiayi Xu、Andreas K. Buckl
DOI:10.1021/ja103771w
日期:2010.7.7
A broad range of highly enantioenriched 2-acylimidazoles are synthesized by palladium-catalyzed decarboxylative asymmetric allylic alkylation (DAAA) of 2-imidazolo-substituted enol carbonates. The enantioenriched 2-acylimidazole products can easily be converted to the corresponding carboxylic acid, ester, amide, and ketone derivatives with complete retention of the enantiopurity. The synthetic utility
通过钯催化的 2-咪唑取代烯醇碳酸酯的脱羧不对称烯丙基烷基化 (DAAA) 合成了广泛的高度对映体富集的 2-酰基咪唑。富含对映体的 2-酰基咪唑产物可以很容易地转化为相应的羧酸、酯、酰胺和酮衍生物,同时完全保留对映体纯度。这种新方法的合成效用在短而有效的西替地尔合成中得到了证明。