Palladium-Catalyzed α,β-Dehydrogenation of Esters and Nitriles
摘要:
A highly practical and general palladium-catalyzed methodology for the alpha,beta-dehydrogenation of esters and nitriles is repotted. Generation of a zinc enolate or (cyanoalkyl)zinc species followed by the addition of an allyl oxidant and a palladium catalyst results in synthetically useful yields of alpha,beta-unsaturated esters, lactones, and nitriles. Preliminary mechanistic investigations are consistent with reversible beta-hydride elimination and turnover-limiting, propene-forming reductive elimination.
Palladium-Catalyzed α,β-Dehydrogenation of Esters and Nitriles
作者:Yifeng Chen、Justin P. Romaire、Timothy R. Newhouse
DOI:10.1021/jacs.5b02243
日期:2015.5.13
A highly practical and general palladium-catalyzed methodology for the alpha,beta-dehydrogenation of esters and nitriles is repotted. Generation of a zinc enolate or (cyanoalkyl)zinc species followed by the addition of an allyl oxidant and a palladium catalyst results in synthetically useful yields of alpha,beta-unsaturated esters, lactones, and nitriles. Preliminary mechanistic investigations are consistent with reversible beta-hydride elimination and turnover-limiting, propene-forming reductive elimination.
Gavriloff, Bulletin de la Classe des Sciences, Academie Royale de Belgique, 1933, vol. <5>19, p. 815,819