Li JC, Yan BX, Wang G, Ye ZS. Rhodium-Catalyzed Selective Nucleophilic Cyclization/Cross-Coupling of Two
ortho-Alkynylanilines Bearing Differential
N-Substituents.
Org Lett 2023;
25:5890-5895. [PMID:
37530173 DOI:
10.1021/acs.orglett.3c02180]
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Abstract
Herein, we reported an effective selective nucleophilic cyclization/cross-coupling cascade reaction of N-tosyl ortho-alkynylanilines and N-acyl ortho-alkynylanilines using Rh(COD)2BF4/tBuXantPhos as a catalyst. The present protocol features excellent chemo- and regioselectivity, high atom-economy, and a broad range of substrates. The mechanism studies indicated that the key to the success of this reaction is the powerful capacity of the rhodium catalyst to recognize the N-substituent group in the selective nucleophilic cyclization and selective alkyne insertion.
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