Palladium-Catalyzed Allenamide Carbopalladation/Allylation with Active Methine Compounds
作者:Xiaoyi Zhu、Ruibo Li、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.1c01369
日期:2021.6.18
carbopalladation/allylation with active methine compounds has been developed. Various indoles and isoquinolinones bearing a quaternary carbon center were achieved with good efficiency, a broad substrate scope and good functional group tolerance. This reaction underwent cascade oxidative addition, carbopalladation, and allylicalkylation, and two new C–C bonds were formed in one pot.
Regioselective Pd-Catalyzed Carbopalladation/Decarboxylative Allylic Alkynylation of <i>ortho</i>-Iodoallenamides with Alkynyl Carboxylic Acids
作者:Jonathan Hédouin、Vincent Carpentier、Romain M. Q. Renard、Cédric Schneider、Isabelle Gillaizeau、Christophe Hoarau
DOI:10.1021/acs.joc.9b01408
日期:2019.8.16
A regioselective Pd-catalyzed domino carbopalladation/decarboxylative allylicalkynylation of ortho-iodoallenamides with alkynyl carboxylic acids was studied. This domino process, based on the consecutive formation of C(sp2)–C(sp2) and C(sp3)–C(sp) bonds, was originally achieved for the design of a novel library of prop-2-ynyl isoquinolinones and then extended to indoles. Finally, a general three-step
π-Allylpalladium intermediates are known to participate efficiently in transformations involving nucleophilic species. Exploring these processes, we have developed a method for the preparation of allyl acetates via palladium-catalysed functionalisation of allenes and 1,3-dienes. Reactions of aryl iodides with either of these two classes of compounds and excess sodium acetate in the presence of Pd(OAc)2
Sequential hydrostannylation-cyclisation of δ- and ω-allenyl aryl halides. Cyclisation at the proximal carbon
作者:Ronald Grigg、JoséM Sansano
DOI:10.1016/0040-4020(96)00801-0
日期:1996.10
catalysed hydrostannylation of (Bu3SnH, THF, 0°C) of δ- and ω-allenylarylhalides followed by mono- or bis-cyclisation (MeCN, 80°C) affords small (5–7), large (11–17) and spirocyclic rings in which cyclisation occurs at the proximalcarbon of the orginal allene. The reaction proceeds via stereoselective allylstannane formation. The cyclisation products are α-vinyl oxygen- and nitrogen-heterocycles
Palladiumcatalysed processes involving sequential cyclisation of aryl iodides onto proximate allenes with capture by NaN3 (and NaO2SPh) followed by a 1,3-dipolar cycloaddition reaction utilizing DMAD, methyl propiolate and norbornadiene are described. When utilising the latter, the sequence can be carried out as a one-pot protocol which terminates with a retro Diels-Alder reaction.