Nahide PD, Jiménez-Halla JOC, Wrobel K, Solorio-Alvarado CR, Ortiz Alvarado R, Yahuaca-Juárez B. Gold(i)-catalysed high-yielding synthesis of indenes by direct C
sp3-H bond activation.
Org Biomol Chem 2019;
16:7330-7335. [PMID:
30259052 DOI:
10.1039/c8ob02056f]
[Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A catalytic, practical and high-yielding procedure for the synthesis of indenes by direct Csp3-H activation under gold(i) catalysis was developed. The scope of the protocol was determined by synthesizing some electron-neutral, electron-poor as well as electron-rich derivatives including the dibenzofurane and carbazole heterocycles. The mechanism of this reaction was elucidated by theoretical calculations using a ONIOM(M08-HX/mixed-basis:PM6) hybrid scheme. Thereby we found a pericyclic transformation involving a [1,5]-H shift generating a gold(i)-carbene that evolves to the indene derivative. In comparison with several reports, our protocol presents a direct activation of the Csp3-H bond.
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