Palladium-Catalyzed Alkenylation and Alkynylation of <i>ortho</i>-C(sp<sup>2</sup>)–H Bonds of Benzylamine Picolinamides
作者:Yingsheng Zhao、Gang He、William A. Nack、Gong Chen
DOI:10.1021/ol301214u
日期:2012.6.15
An efficient functionalization of ortho-C(sp2)–H bonds of picolinamide (PA)-protected benzylamine substrates with a range of vinyl iodides as well as acetylenic bromide is reported. ortho-Phenyl benzoic acid (oPBA) acts as an effective promoter in this reaction system. This method provides a practical strategy to access highly functionalized benzylamine compounds for organic synthesis.
Cobalt‐Mediated Decarboxylative/Desilylative C−H Activation/Annulation Reaction: An Efficient Approach to Natural Alkaloids and New Structural Analogues
A Co(II)- mediated decarboxylative/desilylative C−H activation/annulation reaction for the synthesis of 3-arylisoquinoline derivatives has been developed with a good functional group tolerance and wide applications.
Pd(II)-Catalyzed Direct Sulfonylation of Benzylamines Using Sodium Sulfinates
作者:Ujjwal Karmakar、Rajarshi Samanta
DOI:10.1021/acs.joc.8b03098
日期:2019.3.1
A Pd(II)-catalyzed direct sulfonylation of benzylamines with sodium sulfinates using a removable bidentate directing group is illustrated. The transformation is highly regioselective and tolerates wide functional groups. The mechanistic study reveals that radical species are involved in this reaction. This method delivers a direct synthetic strategy to obtain highly functionalized sulfonylated benzylamines.
Palladium-Catalyzed Alkylation of <i>ortho</i>-C(sp<sup>2</sup>)–H Bonds of Benzylamide Substrates with Alkyl Halides
作者:Yingsheng Zhao、Gong Chen
DOI:10.1021/ol201930e
日期:2011.9.16
A highly efficient and generally applicable method has been developed to functionalize the ortho-C(sp(2)) H bonds of picolinamide (PA)-protected benzylamine substrates with a broad range of beta-H-containing alkyl halides. Sodium triflate has been identified as a critical promoter for this reaction system. The PA group can be easily installed and removed under mild conditions. This method provides a new strategy to prepare highly functionalized benzylamines for the synthesis of complex molecules.
Scope and Limitations of Auxiliary-Assisted, Palladium-Catalyzed Arylation and Alkylation of sp<sup>2</sup> and sp<sup>3</sup> C–H Bonds
作者:Enrico T. Nadres、Gerson Ivan Franco Santos、Dmitry Shabashov、Olafs Daugulis
DOI:10.1021/jo4013628
日期:2013.10.4
auxiliary-assisted direct arylation and alkylation of sp2 and sp3 C–H bonds of amine and carboxylic acid derivatives has been investigated. The method employs a palladium acetate catalyst, substrate, aryl, alkyl, benzyl, or allyl halide, and inorganic base in tert-amyl alcohol or water solvent at 100–140 °C. Aryl and alkyl iodides as well as benzyl and allyl bromides are competent reagents in this transformation