Straightforward synthesis of thiazolo[5,4-<i>c</i>]isoquinolines from dithiooxamide and 2-halobenzaldehydes
作者:Letícia D. Costa、Samuel Guieu、Maria do Amparo F. Faustino、Augusto C. Tomé
DOI:10.1039/d1nj05536d
日期:——
method for the preparation of thiazolo[5,4-d]thiazoles (TzTz). However, we report here that, using adequately substituted 2-halobenzaldehydes, this reaction may afford selectively thiazolo[5,4-c]isoquinolines (TzIQ) or mixtures of TzTz and TzIQ. The use of lanthanum(III) triflate as the catalyst favors the formation of TzIQ. The results obtained using a large number of substituted benzaldehydes showed
二硫代草酰胺与芳香醛的反应是制备噻唑并[5,4- d ]噻唑(TzTz)的众所周知的方法。然而,我们在此报告,使用充分取代的 2-卤代苯甲醛,该反应可以选择性地提供噻唑并[5,4- c ] 异喹啉 (TzIQ) 或 TzTz 和 TzIQ 的混合物。使用三氟甲磺酸镧( III )作为催化剂有利于TzIQ的形成。使用大量取代苯甲醛得到的结果表明,醛上卤素原子和其他取代基的性质、数量和位置对反应结果有很大影响。通过单晶X射线衍射揭示了6个TzTz和6个TzIQ的结构。