Rhodium-Catalyzed Regio- and Enantioselective Allylic Amination of Racemic 1,2-Disubstituted Allylic Phosphates
作者:Wen-Bin Xu、Minghe Sun、Mouhai Shu、Changkun Li
DOI:10.1021/jacs.1c04016
日期:2021.6.9
Alkynylphosphines are rarely used as ligands in asymmetric metal catalysis. We synthesized a series of chiral bis(oxazoline)alkynylphosphine ligands and used them in Rh-catalyzed highly regio- and enantioselective allylic amination reactions of 1,2-disubstituted allylic phosphates. Chiral 1,2-disubstituted allylic amines were synthesized in up to 95% yield with >20:1 branched/linear (b/l) ratio and
炔基膦很少用作不对称金属催化中的配体。我们合成了一系列手性双(恶唑啉)炔基膦配体,并将它们用于 Rh 催化的 1,2-二取代烯丙基磷酸酯的高度区域和对映选择性烯丙基胺化反应。手性 1,2-二取代烯丙基胺的合成产率高达 95%,支链/线性 (b/l) 比 >20:1 ,外消旋 1,2-二取代烯丙基前体的ee为99% 。双(恶唑啉)炔基膦配体中 P 原子上空间较小的线性炔基是满足引入大体积 2-R' 基团的新要求的关键。