Double C–S bond formation via C–H bond functionalization: synthesis of benzothiazoles and naphtho[2,1-d]thiazoles from N-substituted arylamines and elemental sulfur
作者:Xiaoming Zhu、Yuzhong Yang、Genhua Xiao、Jianxin Song、Yun Liang、Guobo Deng
DOI:10.1039/c7cc07366f
日期:——
A novel, atom economic, and environmentally friendly method for the synthesis of 2-substituted benzothiazoles and 2-substituted naphtho[2,1-d]yhiazoles from N-substituted arylamines and elemental sulfur has been developed under metal-free conditions. The reaction underwent the process of double C-Sbonds formation through C-H bonds functionalization.
Elemental sulfur mediated cyclization via redox strategy: Synthesis of benzothiazoles from o -chloronitrobenzenes and benzyl chlorides
作者:Xin Wang、Dazhuang Miao、Xiaotong Li、Renhe Hu、Zhao Yang、Ren Gu、Shiqing Han
DOI:10.1016/j.tet.2017.07.013
日期:2017.8
A novel metal-free synthesis of 2-substituted benzothiazoles from easily available o-chloronitrobenzenes and benzyl chlorides using elementalsulfur as traceless oxidizing agent has been developed. The protocol provides a simple, efficient, and atom-economic way to access to benzothiazoles in moderate to excellent yields. And the approach exhibited good functional group tolerance.
2-Arylation/alkylation of benzothiazoles using superparamagneticgraphene oxide-Fe<sub>3</sub>
O<sub>4</sub>
hybrid material as a heterogeneous catalystwith diisopropyl azodicarboxylate (DIAD) as an oxidant
nanocomposites as a heterogeneous catalyst for arylation/alkylation of benzothiazoles with aldehydes and benzylic alcohols in the presence of diisopropyl azodicarboxylate (DIAD) as an oxidant which exclusively produced 2‐aryl (alkyl)‐1H–benzothizoles in moderate to excellent yields. The absence of precious metals and toxic solvent, easy productisolation, and recyclability of the GO‐Fe3O4 with no loss of
在本报告中,我们介绍了氧化石墨烯-氧化铁(GO-Fe 3 O 4)纳米复合物,作为在偶氮二羧酸二异丙酯(DIAD)作为氧化剂存在下苯并噻唑与醛和苄醇的芳基化/烷基化反应的非均相催化剂2-芳基(烷基)-1 H-苯并噻唑的产率中等至优异。该方法的显着优点是不存在贵金属和有毒溶剂,易于产品分离以及GO‐Fe 3 O 4的可回收性而不损失活性。
TBHP/KI-Promoted Annulation of Anilines, Ethers, and Elemental Sulfur: Access to 2-Aryl-, 2-Heteroaryl-, or 2-Alkyl-Substituted Benzothiazoles
作者:Jie Zhang、Xin Zhao、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.9b02145
日期:2019.10.4
TBHP/KI-promoted annulation of anilines with ethers and elemental sulfur has been developed through the selective C-O bond cleavage of ethers under transition-metal-free conditions. A wide range of 2-aryl-, 2-heteroaryl-, and 2-alkyl-substituted benzothiazoles were easily prepared with satisfactory yields and good functional group compatibility.
Use of Molecular Oxygen as a Reoxidant in the Synthesis of 2-Substituted Benzothiazoles via Palladium-Catalyzed CH Functionalization/Intramolecular CS Bond Formation
作者:Kiyofumi Inamoto、Chisa Hasegawa、Junpei Kawasaki、Kou Hiroya、Takayuki Doi
DOI:10.1002/adsc.201000604
日期:2010.10.4
Molecularoxygen (O2) was successfully employed as a reoxidant in cyclizations of thiobenzanilides 1a–s through a palladium-catalyzed CH functionalization/intramolecular CS bondformation process, leading to an efficient, green method for the synthesis of 2-arylbenzothiazoles 2a–s. Addition of cesium fluoride (CsF) greatly enhanced the reactions, which produced variously substituted 2-arylbenzothiazoles