An efficient tandem elimination–cyclization–desulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates
作者:Wei Chen、Pinhua Li、Tao Miao、Ling-Guo Meng、Lei Wang
DOI:10.1039/c2ob27232f
日期:——
An efficient tandem eliminationâcyclizationâdesulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates has been developed. In the presence of TBAFâPdCl2âCu(OAc)2âNEt3, the reactions generated 2-arylbenzofurans(thiophenes) with good yields in one-pot under ligand-free conditions.
I 2 -catalyzed one-pot synthesis of benzofuro/thieno[2,3- b ]pyrrole motifs
作者:Priya Chacko、Kalegowda Shivashankar
DOI:10.1016/j.tet.2018.02.013
日期:2018.3
for the synthesis of a variety of elusive furo[2,3-b]pyrrole and thieno[2,3-b]pyrrole libraries has been established. To date, cyclization among alkanone, hydrazine and 2-bromobenzofuran or 2-bromobenzo[b]thiophene has not been explored in one-pot. Thus, the proposed single step protocol provides a versatile alternative to existing routes for accessing useful furo[2,3-b]pyrrole and thieno[2,3-b]pyrrole
建立了一种新颖的I 2催化一锅多组分方案,用于合成各种难以捉摸的呋喃[2,3- b ]吡咯和噻吩并[2,3- b ]吡咯文库。迄今为止,尚未在一锅中研究烷酮,肼和2-溴苯并呋喃或2-溴苯并[ b ]噻吩之间的环化。因此,提出的单步协议为访问有用的呋喃[2,3- b ]吡咯和噻吩并[2,3- b ]吡咯文库提供了一种替代现有途径的通用选择。
Synthesis of Internal Alkynes through the Pd-Catalyzed Coupling of Heteroaryl Halides with Terminal Alkynes
作者:Linhua Lu、Hong Yan、Peng Sun、Yan Zhu、Hailong Yang、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1002/ejoc.201201689
日期:2013.3
Sonogashira-type cross-couplings of functionalized heterocyclic halides with terminalalkynes were performed efficiently at room temperature. The heteroarylhalides were easily prepared from the corresponding heterocyclic compounds. The catalytic system tolerated a very broad scope of substrates; oxazoles, thiazoles, and furans participate in this type of reaction for the first time. This reaction
Highly Efficient Synthesis of 2-Substituted Benzo[b]furan Derivatives from the Cross-Coupling Reactions of 2-Halobenzo[b]furans with Organoalane Reagents
route for the synthesis of 2-substituted benzo[b]furans has been developed by palladium-catalyzed cross-coupling reaction of 2-halobenzo[b]furans with aryl, alkynyl, and alkylaluminum reagents. Various 2-aryl-, 2-alkynyl-, and 2-alkyl-substituted benzo[b]furan derivatives can be obtained in 23–97% isolated yields using 2–3 mol% PdCl2/4–6 mol% XantPhos as the catalyst under mild reaction conditions. The
A highly efficient TBAF-promoted intramolecular cyclization of gem-dibromoolefins for the synthesis of 2-bromobenzofurans(thiophenes)
作者:Wei Chen、Yicheng Zhang、Lei Zhang、Min Wang、Lei Wang
DOI:10.1039/c1cc13967c
日期:——
A highlyefficient tetra-(n-butyl)ammonium fluoride (TBAF)-promoted intramolecular cyclization of gem-dibromoolefins has been developed for the synthesis of 2-bromobenzofused heterocycles. The reaction provides a convenient approach to 2-bromobenzofurans(thiophenes) from the corresponding readily available gem-dibromovinyl substrates without a metal.