Journal
ACS CATALYSIS
Volume 10, Issue 15, Pages 8247-8253Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c02660
Keywords
photocatalysis; chiral phosphate catalysis; alkene functionalization; energy transfer; multicomponent reaction
Categories
Funding
- NSFC [21602214]
- Youth Innovation Promotion Association, CAS
- University of Science and Technology of China
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A light-mediated asymmetric dicarbofunctionalization of enamides with carboxylic-acid-derived redox-active esters (RAEs) and indoles has been established by using chiral lithium phosphate catalysis in the presence or absence of photoredox catalyst. This reaction features mild reaction conditions and broad substrate scopes, delivering a wide range of highly functionalized chiral amine derivatives. Mechanistic studies suggest that chiral lithium phosphate can serve as a pocket to accelerate the aggregation of enamide and RAE through hydrogen-bonding and coordination interaction, enabling the formation of a charge-transfer complex (CTC). Either enamide or CTC can be excited by direct irradiation or Ru(II)-mediated photosensitization to furnish chiral iminium intermediates for the asymmetric Friedel-Crafts reaction of indole.
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