Acyl radicals are invaluable intermediates in organic synthesis, however their generation remains challenging. Herein, we present an unprecedented light‐driven, cobalt‐catalysed method for the generation of acyl radicals from readily available 2‐S‐pyridyl thioesters. The synthetic potential of this methodology was demonstrated in the Giese‐type acylation of activated olefins in the presence of heptamethyl
Ligated Regioselective PdII Catalysis to Access β-Aryl-Bearing Aldehydes, Ketones, and β-Keto Esters
作者:Mari Vellakkaran、Murugaiah M. S. Andappan、Nagaiah Kommu
DOI:10.1002/ejoc.201200770
日期:2012.9
arylative isomerization of allyl alcohols, a milder and regioselectiveaccess to the versatile building blocks β-aryl aldehydes and ketones was developed. This new and chelation-controlled protocol enabled the compatibility of wide range of functionalities to generate dihydrochalcones, α-benzyl-α′-alkyl acetones, dihydrocinnamaldehydes, and α-benzyl β-keto esters (from Baylis–Hillman adducts). A practical
New hydroacylation catalysts: Highly electron‐rich N‐heterocyclic carbenes (NHCs) facilitate the intermolecular hydroacylation of unstrained olefins. This unprecedented organocatalytic coupling joins simple and abundant aldehydes and styrenes to yield valuable ketone products. EWG=electron‐withdrawing group, EDG=electron‐donating group.
Ñ EW ħ ydroacylation Ç atalysts:富电子高度N-杂环卡宾(NHC的)无应变促进烯烃的分子间加氢酰化。这种前所未有的有机催化偶合使简单而丰富的醛和苯乙烯结合在一起,可制得有价值的酮产品。EWG =吸电子基团,EDG =给电子基团。
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.