Tanaka K, Hattori H, Yabe R, Nishimura T. Ir-Catalyzed cyclization of α,ω-dienes with an
N-methyl group
via two C-H activation steps.
Chem Commun (Camb) 2022;
58:5371-5374. [PMID:
35411896 DOI:
10.1039/d2cc01275h]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iridium-catalyzed sp3 C-H alkylation of an N-methyl group with 1,5- and 1,6-dienes proceeded to give five- and six-membered carbocyclic compounds, respectively, in high yields. The reaction involves intermolecular alkylation of the N-methyl group with a vinyl moiety and subsequent intramolecular cyclization at the β-position of the initially formed alkylated intermediate. The reaction using a chiral bidentate phosphine ligand enabled the asymmetric synthesis of the cyclic compounds.
Collapse