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Beilstein J Org Chem ; 18: 251-261, 2022.
Article in English | MEDLINE | ID: mdl-35330776

ABSTRACT

An experimental and theoretical investigation on the iridium-catalyzed hydroacylation of C1-substituted oxabenzonorbornadienes with salicylaldehyde is reported. Utilizing commercially available [Ir(COD)Cl]2 in the presence of 5 M KOH in dioxane at 65 °C, provided a variety of hydroacylated bicyclic adducts in up to a 95% yield with complete stereo- and regioselectivity. The mechanism and origins of selectivity in the iridium-catalyzed hydroacylation reaction has been examined at the M06/Def2TZVP level of theory. The catalytic cycle consists of three key steps including oxidative addition into the aldehyde C-H bond, insertion of the olefin into the iridium hydride, and C-C bond-forming reductive elimination. Computational results indicate the origin of regioselectivity is involved in the reductive elimination step.

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