Synthesis of 2-Thio-Substituted Benzothiazoles via a Domino Condensation/<i>S</i>-Arylation/Heterocyclization Process
作者:Liu Shi、Xiangqian Liu、Hui Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo200535e
日期:2011.5.20
Condensation of carbon disulfide with thiols in the presence of K2CO3 generates carbonotrithioate salts in situ, which undergo coupling with 2-iodoanilines and subsequent intramolecular condensation and elimination under assistance of CuBr to afford 2-thio-substituted benzothiazoles. Both aliphatic and aromatic thiols are compatible with this process, delivering the corresponding heterocycles with
在K 2 CO 3存在下,二硫化碳与硫醇的缩合原位生成三硫代碳酸盐,将其与2-碘苯胺偶联,随后在CuBr的帮助下进行分子内缩合和消除,得到2-硫基取代的苯并噻唑。脂族和芳族硫醇均与该过程相容,从而提供具有良好多样性的相应杂环。
Easy S-Alkylation of Arylthioureas and 2-Mercaptobenzothiazoles Using Tetraalkylammonium Salts under Transition-Metal-Free Conditions
作者:Xiao-Hu Xu、Er-Jun Hao、Zhen Shi、Zhi-Bing Dong
DOI:10.1021/acs.joc.2c00728
日期:2022.8.5
A highly-efficient and practical method for S-alkylation of arylthioureas was reported. Using tetraalkylammonium salts as alkylation reagents, a series of 68 S-substituted aryl-isothioureas were obtained in good to excellent yields under transition-metal-free conditions. The protocol features simple performance, broad functional group tolerance, good to excellent yields, and easily available starting