Facile synthesis of pyrazoles and pyrroles via thermolysis of tetrazolo[1,5-b]pyridazines, tetrazolo[1,5-a]pyrimidines and tetrazolo[1,5-a]pyridines
作者:Daniele Simoni、Riccardo Rondanin、Giancarlo Furnò、Enrico Aiello、Francesco Paolo Invidiata
DOI:10.1016/s0040-4039(00)00243-4
日期:2000.4
A simple and high yielding preparation of pyrazoles and pyrroles is described. Thermolysis of tetrazolo[1,5-b]pyridazines, tetrazolo[1,5-a]pyrimidines and tetrazolo[1,5-a]pyridines allowed easy ring contraction thus providing a facile preparation of cyanopyrazole and cyanopyrrole heterocycles. Since the cyano group is a versatile precursor of other functionalities, the reaction appears of particular
描述了一种简单且高产率的吡唑和吡咯的制备方法。四唑并[1,5- b ]哒嗪,四唑并[1,5- a ]嘧啶和四唑并[1,5- a ]吡啶的热解使环易于收缩,从而提供了氰基吡唑和氰基吡咯杂环的简便制备方法。由于氰基是其他官能团的通用前体,因此该反应对于构建各种吡唑和吡咯特别感兴趣。起始四唑衍生物的简单制备,所采用的相对温和的条件以及非常短的反应时间使这种通用的方法具有很高的合成实用性,可用于小规模和大规模的制备。