B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed cyclization of alkynes: direct synthesis of 3-silyl heterocyclic compounds
作者:Mengxing Li、Ting Wang、Zhenyu An、Rulong Yan
DOI:10.1039/d0cc04314a
日期:——
An efficient one-pot strategy for easy access to 3-silyl heterocyclic compounds was developed via a B(C6F5)3-catalyzed cycloaddition reaction of o-(1-alkynyl)(thio)anisoles or o-(1-alkynyl)-N-methylaniline.
aryl iodides in the presence of catalytic amounts of [Pd(phen)2][PF6]2 resulted in the efficient formation of 3-arylated benzo[b]thiophenes, and a range of aryl iodides with electron-donating or -withdrawing groups could be used. While this reaction proceeded in the presence of aromatic and aliphatic groups on the terminal alkynyl carbon atom, silyl and alkoxycarbonyl groups hampered the reaction. Furthermore
在催化量的[Pd(phen)2 ] [PF 6 ] 2存在下,邻-(1-炔基)硫代苯甲醚与芳基碘的芳基环化反应可有效形成3-芳基苯并[ b ]噻吩可以使用一定范围的带有给电子或吸电子基团的芳基碘化物。尽管该反应在末端炔基碳原子上存在芳族和脂族基团的情况下进行,但是甲硅烷基和烷氧基羰基基团阻碍了反应。此外,该方法可扩展到由N,N-二甲基-o合成3芳基吲哚-(1-炔基)苯胺。所有这些反应都通过裂解碳-杂原子键而顺利进行。除所需的环化产物外,在硫原子上使用邻-(羟丙基)苯基甲基取代基提供了异色满,其应通过羟基分子内攻击苄基碳原子而形成。
Electrochemical synthesis of sulfonated benzothiophenes using 2-alkynylthioanisoles and sodium sulfinates
作者:Ming-Ming Zhang、Yu Sun、Wan-Wan Wang、Kang-Kang Chen、Wen-Chao Yang、Lei Wang
DOI:10.1039/d1ob00079a
日期:——
Electrochemicalsulfonylation/cyclization of 2-alkynylthioanisoles with sodiumsulfinates was developed under catalyst-, external oxidant- and metal-free conditions. The electrosynthesis provides sustainable and efficient access to 3-sulfonated benzothiophenes with good substrate scope and functional group tolerance. This cascade radical process has been triggered through a sulfonyl radical addition
BCl<sub>3</sub>
-Induced Annulative Oxo- and Thioboration for the Formation of C3-Borylated Benzofurans and Benzothiophenes
作者:Andrew J. Warner、Anna Churn、John S. McGough、Michael J. Ingleson
DOI:10.1002/anie.201610014
日期:2017.1.2
form synthetically ubiquitous pinacol boronate esters or used in situ in Suzuki-Miyauracrosscouplings to generate 2,3-disubstituted heteroarenes from simple alkyne precursors in onepot. In a number of cases alkyne trans-haloboration occurs alongside, or instead of, borylative cyclization and the factors controlling the reaction outcome are determined.
Synthesis of novel artesunate-benzothiophene and artemisinin-benzothiophene derivatives
作者:Omruye Ozok、Emrah Kavak、Arif Kivrak
DOI:10.1080/14786419.2021.1928116
日期:2022.10.18
variety of diseases for many years. Last decades, design and synthesis of novel biologically active hybrid molecules including natural product is gained big importance due to their unique and new biological properties. In the present study, novel artemisinin-benzothiophene derivatives (12 A-F) are synthesised. Initially, benzothiophene derivatives (4 A-4F) are prepared via the Pd-catalyzed coupling reactions