Stereoselective Synthesis of Tetrasubstituted Alkenes via a Cp*CoIII -Catalyzed C-H Alkenylation/Directing Group Migration Sequence

Angewandte Chemie
Hideya IkemotoShigeki Matsunaga

Abstract

A highly atom economical and stereoselective synthesis of tetrasubstituted α,β-unsaturated amides was achieved by a Cp*CoIII -catalyzed C-H alkenylation/directing group migration sequence. A carbamoyl directing group, which is typically removed after C-H functionalization, worked as an internal acylating agent and migrated onto the alkene moiety of the product. The directing group migration was realized with the Cp*CoIII catalyst, while a related Cp*RhIII catalyst did not promote the migration process. The product was further converted into two types of tricyclic compounds, one of which had fluorescent properties.

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