Enantioselective Nazarov Cyclizations Catalyzed by an Axial Chiral C6 F5 -Substituted Boron Lewis Acid.

Lars Süsse,Maria Vogler,Marius Mewald,Benedict Kemper,Elisabeth Irran,Martin Oestreich

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION（2018）

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摘要

A chiral variant of B(C6 F5 )3 with a 3,3'-disubstituted binaphthyl backbone is shown to catalyze Nazarov cyclizations with high levels of enantio- and diastereocontrol. The parent B(C6 F5 )3 also promotes these ring closures efficiently. This electrocyclization is another example of the still small family of C-C bond formations mediated by B(C6 F5 )3 as the catalyst.

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关键词

asymmetric catalysis,boron,C-C bond formation,electrocyclic reactions,Lewis acids

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