作者:Thilo Kratz、Pit Steinbach、Stefan Breitenlechner、Golo Storch、Christoph Bannwarth、Thorsten Bach
DOI:10.1021/jacs.2c02511
日期:2022.6.15
to axially chiral alkenes is described. Starting from a racemic mixture, a major alkene enantiomer is formed due to selective triplet energy transfer from a catalytically active chiral sensitizer. A catalyst loading of 2 mol % was sufficient to guarantee consistently high enantioselectivities and yields (16 examples, 51%-quant., 81–96% ee). NMR studies and DFT computations revealed that triplet energy
描述了一种对轴向手性烯烃的可见光介导的对映选择性方法。从外消旋混合物开始,由于催化活性手性敏化剂的选择性三重态能量转移,形成了主要的烯烃对映异构体。2 mol% 的催化剂负载量足以保证始终如一的高对映选择性和产率(16 个示例,51%-quant.,81-96% ee)。NMR 研究和 DFT 计算表明,三重态能量转移在次要烯烃对映异构体的底物-催化剂复合物中更快。由于这种对映异构体不断外消旋,主要对映异构体在光稳定状态下富集。