Sun Y, Pan J, Wang X, Bu X, Ma M, Xue F. Rhodium-Catalyzed Asymmetric Annulation of Unactivated Alkynes with 3-(
ortho-Boronated Aryl) Conjugated Enones: Enantioselective Synthesis of 2,3-Disubstituted Indenes.
J Org Chem 2023;
88:6140-6145. [PMID:
37019474 DOI:
10.1021/acs.joc.2c02957]
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Abstract
A rhodium-catalyzed tandem arylation/cyclization reaction of 3-(ortho-boronated aryl) conjugated enones with unactivated alkynes is reported. By using a rhodium(I)/chiral-diene complex as the catalyst, the protocol was processed smoothly to provide various 2,3-disubstituted indene compounds in high yields with excellent regioselectivities and enantioselectivities. The approach outlined herein is appealing, as simple diarylalkynes, diakylalkynes, and alkyl(aryl)alkynes are the starting materials.
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