A novel facile route for the introduction of 5-amino and 5-alkylamino substituents into 1-aryltetrazoles has been developed. A range of 5-amino-1-aryltetrazoles was obtained directly from the corresponding 1-aryltetrazoles in one pot by consecutive ring-opening, azidation and intramolecular cyclization. 5-Alkylamino-1-aryltetrazoles were formed by a similar mechanism from 1,4-disubstituted tetrazolium salts. An influence of the nature of aryl substituents and reaction conditions on the regioselectivity of the intramolecular cyclization of intermediate guanyl azides is revealed.
已开发出一种新颖简便的方法,将5-
氨基和5-烷基
氨基取代基引入到1-芳基
四唑中。通过连续的开环、
叠氮化和分子内环化反应,从相应的1-芳基
四唑一锅获得了一系列5-
氨基-1-芳基
四唑。5-烷基
氨基-1-芳基
四唑是通过类似机制从1,4-二取代的
四唑盐形成的。研究揭示了芳基取代基的性质和反应条件对中间体
氨基
叠氮盐分子内环化反应的区域选择性的影响。