[EN] SILICON-BASED CROSS COUPLING AGENTS AND METHODS OF THEIR USE<br/>[FR] AGENTS DE COUPLAGE CROISÉ À BASE DE SILICIUM ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV PENNSYLVANIA
公开号:WO2016011231A1
公开(公告)日:2016-01-21
Compositions and methods using silicon-based cross-coupling agents in the formation of carbon-carbon and carbon-nitrogen bonds are described.
Conversion of Aldehydes to Branched or Linear Ketones via Regiodivergent Rhodium-Catalyzed Vinyl Bromide Reductive Coupling–Redox Isomerization Mediated by Formate
作者:Robert A. Swyka、William G. Shuler、Brian J. Spinello、Wandi Zhang、Chunling Lan、Michael J. Krische
DOI:10.1021/jacs.9b03113
日期:2019.5.1
coupling-redox isomerization to form branched ketones. Use of the less strongly coordinating ligand, PPh3, promotes vinyl- to allylrhodium isomerization en route to linear ketones. This method bypasses the 3-step sequence often used to convert aldehydes to ketones involving the addition of pre-metalated reagents to Weinreb or morpholine amides.
A carboxylate-directed palladium-catalyzed Mizoroki–Heck alkenylation of γ,δ-unsaturated carboxylic acids with alkenyl bromides is reported. This carboxylate group is effective for chelation to a Pd center, enabling the distal alkenylation of electronically unbiased internal alkenes in the formation of conjugated 1,3-dienes with high stereoselectivity. In addition, the conjugated 1,3-diene products