Cobalt‐Catalyzed Asymmetric 1,4‐Reduction of
<i>β,β‐</i>
Dialkyl
<i>α</i>
,
<i>β</i>
‐Unsaturated Esters with PMHS
作者:Dongpo Lu、Peng Lu、Zhan Lu
DOI:10.1002/ejoc.202100856
日期:2021.9.14
A cobalt-catalyzed asymmetric reduction of β,β-dialkyl α,β-unsaturated esters with polymethylhydrosiloxane (PMHS) was reported to deliver the corresponding esters containing a chiral trialkyl carbon center at β-position with up to 97 % yield and 98 % ee. The chiral tridentate ligand oxazoline iminopyridine (OIP) could perform well for the asymmetric reduction instead of chiral bidentate ligands. This
据报道,用聚甲基氢硅氧烷 (PMHS)对β , β - 二烷基α , β -不饱和酯进行钴催化的不对称还原可提供相应的酯,该酯在β位含有手性三烷基碳中心,产率高达 97%,ee 达 98% . 手性三齿配体恶唑啉亚氨基吡啶 (OIP) 可以代替手性双齿配体在不对称还原方面表现良好。这个操作简单的协议显示了广泛的底物,使用一当量的现成 PMHS 作为廉价且易于处理的还原试剂。