Abstract
Herein, a rhenium-catalyzed [3 + 2] carbocyclization of N–H ketimines and alkynes through C–H bond activation to afford unprotected tertiary indenamines is described. Notably, the catalytic use of a cheap base, sodium carbonate, was demonstrated to be crucial to the success of this reaction. The protocol is also highlighted by a high atom-economy, a broad substrate scope, and excellent regioselectivity for unsymmetrical alkynes.
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