Temperature-Controlled Thiation of α-Cyano-β-Alkynyl Carbonyl Derivatives for De Novo Synthesis of 2-Aminothiophenes and Thieno[2,3-<i>c</i>]isothiazoles
作者:Tzu-Ting Kao、Po-Kai Peng、Min-Chieh Liang、Chia-Jui Lee、I-Chia Chen、Kak-Shan Shia、Yen-Ku Wu
DOI:10.1021/acs.joc.8b01866
日期:2018.12.7
Making use of temperature-controlled thiation as a key operation, a simple route to 2-aminothiophenes or thieno[2,3-c]isothiazoles has been newly developed wherein the 2-aminothiophene nucleus was formed through an initial formation of thioamide followed by a 5-exo-dig addition to the tethered alkyne; however, under harsher thermal conditions, excess sulfur-transferring reagents enabled further oxidative
利用温度控制的硫代作为关键操作,新开发了一种简单的制备 2-氨基噻吩或噻吩并[2,3- c ]异噻唑的路线,其中 2-氨基噻吩核是通过初始形成硫代酰胺,然后形成5-exo-dig 连接的炔烃;然而,在更严酷的热条件下,过量的硫转移试剂能够进一步氧化硫代生成相应的噻吩并[2,3- c ]异噻唑。