Synthesis of δ-Bromo γ,δ-Unsaturated Carbonyl Compounds via Palladium-Catalyzed Bromoalkylation of Alkynoates
摘要:
Palladium-catalyzed regio- and stereoselective intermolecular tandem reaction of electron-deficient alkynes, CuBr2, and allylic alcohol to synthesize delta-bromo-gamma,delta-unsaturated carbonyls was developed. A mechanism involving bromopalladation of alkyne, followed by insertion of allylic alcohol and allylic hydrogen shift, is proposed. The shift of allylic hydrogen is the rate-limiting step in this reaction.
Replacing a stoichiometric silver oxidant with air: ligated Pd(<scp>ii</scp>)-catalysis to β-aryl carbonyl derivatives with improved chemoselectivity
作者:Mari Vellakkaran、Murugaiah M. S. Andappan、Nagaiah Kommu
DOI:10.1039/c3gc42504e
日期:——
Air was employed as a green reoxidant of Pd(0), replacing stoichiometric and toxic silver salt, in the chelation-controlled Pd(ii)-modulated arylative enolization of prop-2-en-1-ols to acquire synthetically-important β-aryl carbonyl derivatives.
Palladium-Catalyzed Oxidative Nonclassical Heck Reaction of Arylhydrazines with Allylic Alcohols via C–N Bond Cleavage: Access to β-Arylated Carbonyl Compounds
作者:Xiaoshuo Wang、Xiaojing Wang、Hongwu Pan、Xiayi Ming、Zhenming Zhang、Tao Wang
DOI:10.1021/acs.joc.2c01115
日期:2022.8.5
An efficient palladium-catalyzed oxidative nonclassical Heck reaction of arylhydrazines with allylic alcohols via C–N bond cleavage has been successfully developed. This method provides a series of β-arylated carbonyl compounds with broad functional group tolerance under base-free, simple, and mild open air reaction conditions. In the reaction, arylhydrazines with the smaller molecular weight of the