PtCl2-catalyzed reactions of o-alkynylanilines with ethyl propiolate and dimethyl acetylenedicarboxylate
作者:Xun Li、Jun-Yan Wang、Wei Yu、Long-Min Wu
DOI:10.1016/j.tet.2008.11.095
日期:2009.2
The PtCl2-catalyzed reactions between indoles and ethylpropiolate gave rise to mono and double addition products. The composition of the products was largely influenced by the substituents on the indoles as well as the amount of ethylpropiolate used. o-Alkynylanilines reacted with ethylpropiolate and dimethyl acetylenedicarboxylate under the catalysis of PtCl2 to generate the corresponding 2,3-disubstituted
Rhodium-catalyzed enantioselective in situ C(sp3)−H heteroarylation by a desymmetrization approach
作者:Yujia Shi、Yan Qiao、Pengfei Xie、Miaomiao Tian、Xingwei Li、Junbiao Chang、Bingxian Liu
DOI:10.1016/j.cclet.2024.109544
日期:2024.10
reasonably achieved through the collaborative control of a large silicon substituted chiral ligand and C−H···, LP··· interactions between aryl rings of the carboxylate group and the substrate. Control experiments demonstrate that Rh-aryl bond formation nucleophilic cyclization is more critical for reaction efficiency than C−H activation of the nucleophilic cyclization byproduct.
A wide range of o-alkynylanilines undergo a copper-catalyzed direct C-H/N-H coupling with azoles followed by benzannulation to form the corresponding N-azolylindoles in good yields. The domino reaction proceeds effectively with molecular oxygen as the sole oxidant and provides a new dehydrogenative access to the titled compounds of interest in pharmaceutical and material sciences.
An Annulative Electrophilic Amination Approach to 3-Aminobenzoheteroles
A copper-catalyzed annulative amination approach to 3-aminobenzofurans and -indoles from o-alkynylphenols and -anilines has been developed. The Cu-based catalysis is based on an umpolung, electrophilic amination with O-benzoyl hydroxylamines and enables the mild and convergent synthesis of various 3-aminobenzoheteroles of biological and pharmaceutical interest. Some mechanistic investigations and an application of this protocol to construction of more complex tricyclic framework are also described.
The PdCl2-catalyzed sequential heterocyclization/Michael addition cascade in the synthesis of 2,3-disubstituted indoles
作者:Donala Janreddy、Veerababurao Kavala、Chun-Wei Kuo、Ting-Shen Kuo、Chiu-Hui He、Ching-Fa Yao
DOI:10.1016/j.tet.2013.01.081
日期:2013.4
A cascade reaction of 2-N-unprotected-2-alkynylanilines and various electron-deficient alkenes in the presence of PdCl2 provided 2,3-disubstituted indole derivatives, whereas, in the presence of Pd(OAc)(2), the same reaction resulted in the production of N-alkylated-2-alkynylaniline derivatives. (C) 2013 Elsevier Ltd. All rights reserved.