Polymer-Supported Tribromide as a New Solid Phase and Recyclable Catalyst for the Synthesis of 2-(<i>N</i>-Arylamino)benzothiazoles Under Solvent-Free Microwave Irradiation Conditions
作者:Lokendrajit Nahakpam、Brajakishor S. Chingakham、Warjeet S. Laitonjam
DOI:10.1002/jhet.1928
日期:2015.1
The solid‐phase synthesis of 2‐(N‐arylamino)benzothiazoles is achieved by reacting substituted thioureas with polymer‐supported tribromide. A series of 2‐(N‐aryl)aminobenzothiazoles is prepared in high yields under microwave irradiation. The method has several advantages such as short reaction time, good yields, and environmentally benign procedure. Moreover, the catalyst could be recovered conventionally
<scp>Metal‐Free</scp> Synthesis of <scp>2‐Aminobenzothiazoles</scp> via <scp>I<sub>2</sub>‐Catalyzed</scp> Tandem Cyclization Reaction of Amines and Carbon Disulfide
作者:Ting Chen、Wei Feng、Ruitong Yang、Shanping Chen、Guo‐Jun Deng
DOI:10.1002/cjoc.202300610
日期:2024.4.15
A convenient approach for the construction of 2-aminobenzothiazoles via I2-catalyzed tandem cyclization reaction of amines and carbondisulfide has been developed. The present approach starts from simple and readily available starting materials, affording a series of 2-aminobenzothiazoles in up to 89% yields under metal-free conditions. In this work, C—H/N—H functionalization was achieved and multiple
开发了一种通过 I 2催化胺和二硫化碳的串联环化反应构建 2-氨基苯并噻唑的简便方法。本方法从简单且易于获得的起始原料开始,在无金属条件下以高达 89% 的产率提供一系列 2-氨基苯并噻唑。在这项工作中,实现了C—H/N—H功能化,并在一锅中成功构建了多个C-杂键。
DMSO-mediated palladium-catalyzed cyclization of two isothiocyanates <i>via</i> C–H sulfurization: a new route to 2-aminobenzothiazoles
DMSO was found to activate arylisothiocyanates for self-nucleophilic addition. A subsequent intramolecular C–H sulfurization catalyzed by PdBr2 enables access to a wide range of 2-aminobenzothiazole derivatives in moderate to good yields. This is the first example of a DMSO-mediated Pd-catalyzedsynthesis of 2-aminobenzothiazoles through cyclization/C–H sulfurization of two isothiocyanates.