The palladium-catalyzed synthesis of unsymmetrical 1,3-diarylpropenes from allyl esters through a Mizoroki–Heck-type reaction with aryl iodides followed by allyl cross-coupling with a variety of arylboronicacids was developed; the products are obtained in moderate to good yields by using a hydrazone–Pd(OAc)2 system.
Dual photoredox- and nickel-catalyzed hydroalkylation of terminal alkynes with 4-alkyl-1,4-dihydropyridines under visible light irradiation to afford Markovnikov or anti-Markovnikov-type alkylated alkenes in good-to-high yields has been achieved, in which the regioselectivity of the products was effectively controlled by coordination ligands for nickel catalysts. With [Ir(Fppy)3] (Fppy=3,5-difluor
Selective arylation of 1,1-disubstituted olefins using a biphenyl-based phosphine in Heck coupling reactions
作者:Shirin Nadri、Mohammad Joshaghani、Ezzat Rafiee
DOI:10.1016/j.tetlet.2009.07.052
日期:2009.9
The biphenyl-based phosphine, 2-diphenylphosphino-2'-methylbiphenyl is an effective ligand for palladium-catalyzed terminal arylation of 1,1-disubstituted olefins with aryl bromides in DMF and K2CO3 as base. The yields of products are independent of the electronic properties of the aryl bromides, however, the nature of the olefin has a major effect. (C) 2009 Elsevier Ltd. All rights reserved.