Cu-catalyzed [2 + 2 + 1] cascade annulation of vinyl iodonium salts with elemental sulfur/selenium for the modular synthesis of thiophenes and selenophenes
作者:Yaxing Wu、Chao Wu、Fei Wang、Chao Chen
DOI:10.1039/d1nj05433c
日期:——
A [2 + 2 + 1] annulation protocol has been established for the modular synthesis of 2,4-disubstituted thiophenes/selenophenes, with excellent regioselectivity. The reactions have been catalyzed by copper salt with elemental sulfur and selenium serving as the chalcogen source. The mechanistic study has revealed that this process was initiated by a trisulfur radical anion using EPR.
Efficient Thiophene Synthesis Mediated by 1,3-Bis(carboxymethyl)imidazolium Chloride: C-C and C-S Bond Formation
作者:Patricia Gisbert、Isidro M. Pastor
DOI:10.1002/ejoc.202000484
日期:2020.8.2
This work was financially supported by the University of Alicante (VIGROB-173, VIGROB-285, VIGROB-316FI and UAUSTI19-21), the Spanish Ministerio de Economia y Competitividad (CTQ2015-66624-P, CTQ2017-88171-P), the Spanish Ministerio de Ciencia, Innovacion y Universidades (PGC2018-096616-B-I00) and the Generalitat Valenciana (AICO/2017/007). P. G. thanks the ISO (University of Alicante) for a grant
Transition-Metal-Free Sulfuration/Annulation of Alkenes: Economical Access to Thiophenes Enabled by the Cleavage of Multiple C–H Bonds
作者:Liang Chen、Hao Min、Weilan Zeng、Xiaoming Zhu、Yun Liang、Guobo Deng、Yuan Yang
DOI:10.1021/acs.orglett.8b03078
日期:2018.12.7
and transition-metal-free strategy for the synthesis of thiophenes from substituted buta-1-enes with potassium sulfide has been presented. The reaction achieves double C–Sbondformations via cleavage of multiple C–H bonds and provides an efficientapproach to access various functionalized thiophenes. Moreover, the strategy can also be used for the synthesis of thiophenes from 1,4-diaryl-1,3-dienes.
Thiocarbonyls. VII. Studies on p-Substituted Acetophenones<sup>1</sup>
作者:E. CAMPAIGNE、Wm. BRADLEY REID、JOHN D. PERA
DOI:10.1021/jo01091a017
日期:1959.9
Sulfurative self-condensation of ketones and elemental sulfur: a three-component access to thiophenes catalyzed by aniline acid–base conjugate pairs
作者:Thanh Binh Nguyen、Pascal Retailleau
DOI:10.1039/c7gc03437g
日期:——
A sulfurative self-condensation method for constructing thiophenes 2 by a reaction between ketones 1 and elemental sulfur is reported. This reaction, which is catalyzed by anilines and their salts with strong acids, starts from readily available and inexpensive materials, and releases only water as a by-product.