Cobalt-Catalyzed<i>ortho</i>-C−H Functionalization/Alkyne Annulation of Benzylamine Derivatives: Access to Dihydroisoquinolines
作者:Ángel Manu Martínez、Nuria Rodríguez、Ramón Gómez-Arrayás、Juan C. Carretero
DOI:10.1002/chem.201702283
日期:2017.8.25
A practical picolinamide-directed C−H functionalization/alkyne annulation of benzylaminederivatives enabling access to the previously elusive 1,4-dihydroisoquinoline skeleton was developed using molecular O2 as the sole oxidant and Co(OAc)2 as precatalyst. The method is compatible with both internal and terminal alkynes and shows high versatility and functional-group tolerance. Furthermore, full preservation
Rh<sup>I</sup>/Rh<sup>III</sup> catalyst-controlled divergent aryl/heteroaryl C–H bond functionalization of picolinamides with alkynes
作者:Ángel Manu Martínez、Javier Echavarren、Inés Alonso、Nuria Rodríguez、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1039/c5sc01885d
日期:——
Switchable site-selectivity through catalyst control is achieved in the direct functionalization of picolinamides that contain two distinct C–H sites to construct diverse scaffolds from the same starting material.
Rh(<scp>i</scp>)- and Rh(<scp>ii</scp>)-catalyzed C–H alkylation of benzylamines with alkenes and its application in flow chemistry
作者:Amrita Das、Naoto Chatani
DOI:10.1039/d0sc05813k
日期:——
The Rh-catalyzed C–H alkylation of benzylamines with alkenes using a picolinamide derivative as a directing group is reported. Both Rh(I) and Rh(II) complexes can be used as active catalysts for this transformation. In addition, a flow set up was designed to successfully mimic this process under flow conditions. Several examples are presented under flow conditions and it was confirmed that a flow process
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.
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.