Regio- and stereoselective synthesis of 1-(1-halovinyl)-1H-indoles from 1-ethynyl-1H-indoles with in situ generated HX
摘要:
A facile approach to 1-(1-halovinyl)-1H-indoles from readily accessible 1-ethynyl-1H-indoles with in situ generated HX is described. The simple protocol enables a regio- and stereoselective hydrohalogenation to the triple bonds in gram-scale, and provides a general entry for novel N-alkenylindole derivatives. (C) 2013 Elsevier Ltd. All rights reserved.
vinyl dichlorides and electron deficient amides as the starting material is described. In the absence of transition-metal catalyst, the reaction proceeds under mild reaction conditions in open air and thus rendering a convenient operation. This strategy is not only suitable for both terminal and internal ynamide synthesis but also amenable for large-scale preparation. Broad substrate scopes with respect
General Entry into <i>o</i>
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-Heteroatom-Linked <i>N</i>
-(Hetero)aryl-Imidazole Motifs by Gold-Catalysed Formal [3+2]-Dipolar Cycloaddition
作者:Miguel Garzón、Elsa M. Arce、Raju Jannapu Reddy、Paul W. Davies
DOI:10.1002/adsc.201700249
日期:2017.6.6
general redox‐neutral approach into the o‐,o′‐heteroatom‐linked N‐(hetero)aryl‐imidazole family of heteroaromatics has been developed. New types of heteroatom substituted carbimidoyl nitrenoids are efficiently realised from robust, bench‐stable N‐(heteroaryl)‐pyridinium‐N‐aminides by formal gold‐catalysed [3+2]‐dipolar cycloadditions across ynamides. Broad structural variety and functional group tolerance
Cp*Co(<scp>iii</scp>)-Catalyzed oxidative [5+2] annulation: regioselective synthesis of 2-aminobenzoxepines <i>via</i> C–H/O–H functionalization of 2-vinylphenols with ynamides
作者:Xiang-Lei Han、Xu-Ge Liu、E Lin、Yunyun Chen、Zhuangzhong Chen、Honggen Wang、Qingjiang Li
DOI:10.1039/c8cc06807k
日期:——
A Cp*Co(III)-catalyzed [5+2] C–H annulation reaction of 2-vinylphenols with ynamides was developed. The reaction led to the efficient synthesis of valuable 2-aminobenzoxepines in high regioselectivity. Mild reaction conditions, good functional group tolerance, and moderate to good yields were observed. The synthetic utility was demonstrated by a gram-scale synthesis and further transformations of the
Synthesis of Sulfonamide-Based Ynamides and Ynamines in Water
作者:Lei Zhao、Hongyi Yang、Ruikun Li、Ye Tao、Xiao-Feng Guo、Edward A. Anderson、Andrew Whiting、Na Wu
DOI:10.1021/acs.joc.0c02326
日期:2021.1.15
Ynamides, though relatively more stable than ynamines, are still moisture-sensitive and prone to hydration especially under acidic and heating conditions. Here we report an environmentally benign, robust protocol to synthesize sulfonamide-based ynamides and arylynamines via Sonogashira coupling reactions in water, using a readily available quaternary ammonium salt as the surfactant.
Efficient and Flexible Synthesis of Highly Functionalised 4‐Aminooxazoles by a Gold‐Catalysed Intermolecular Formal [3+2] Dipolar Cycloaddition
作者:Andrew D. Gillie、Raju Jannapu Reddy、Paul W. Davies
DOI:10.1002/adsc.201500905
日期:2016.1.21
fully substituted and functionalised 4‐aminooxazoles are accessed by an efficient intermolecular reaction between an ynamide and an N‐acylpyridinium N‐aminide in the presence of a gold catalyst. The formal [3+2] dipolar cycloaddition employs a nucleophilic nitrenoid approach to access the 1,3‐N,O‐dipole character in a controllable fashion. The selectivity for a cycloaddition pathway provides a stark