Catalytic Enantioselective α-Allylation of Deconjugated Butenolides with Aza-π-allylpalladium 1,4-Dipoles: Access to Optically Pure 2-Piperidones Bearing an All-Carbon Quaternary Stereocenter
作者:Shu-Pei Yuan、Qing Bao、Ting-Jia Sun、Jian-Qiang Zhao、Zhen-Hua Wang、Yong You、Yan-Ping Zhang、Ming-Qiang Zhou、Wei-Cheng Yuan
DOI:10.1021/acs.orglett.2c03383
日期:2022.11.18
4-diploes, in situ generated from palladium-mediated decarboxylation of cyclic carbamates and amide-substituted acyclic carbonates, has been successfully developed. An array of enantioenriched 2-piperidones bearing an all-carbon quaternary stereocenter were obtained in high yields with excellent enantioselectivities (up to 99% yield and 99% ee). The utility of this method was also showcased by a large-scale
已成功开发钯催化的去共轭丁烯酸内酯与氮杂-π-烯丙基钯 1,4-二倍体的对映选择性 α-烯丙基化反应,该反应由钯介导的环状氨基甲酸酯和酰胺取代的无环碳酸酯的脱羧原位生成。以高产率和出色的对映选择性(高达 99% 产率和 99% ee)获得了一系列带有全碳季立构中心的对映体富集 2-哌啶酮。该方法的实用性也通过产品的大规模反应和合成转化得到展示。