期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 23, 页码 10133-10138出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c02511
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [Ba 1372/23, Ba 1372/24, TRR 325 (444632635)]
- DFG [Sto 1175/3]
- Linux-Cluster
- Federal Ministry of Education and Research (BMBF)
- Ministry of Culture and Science (MKW) of the German State of North Rhine-Westphalia under the Excellence Strategy of the Federal Government and the Lander
This study describes a visible-light-mediated, enantioselective approach for the synthesis of axially chiral alkenes. By selectively transferring triplet energy from a racemic mixture, a major alkene enantiomer is formed. A small catalyst loading ensures consistently high selectivities and yields.
A visible-light-mediated, enantioselective approach 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 transfer is more rapid within the substrate-catalyst complex of the minor alkene enantiomer. Since this enantiomer is continuously racemized, the major enantiomer is enriched in the photostationary state.
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