Ring Transformations of Semicyclic 1,3-Dicarbonyl Heteroanalogs; IV<sup>1</sup>. Synthesis of 3-(ω-Aminoalkyl)-1,2,4-thiadiazoles by Ring Transformation Reaction of Semicyclic Thioacylamidines with 3,3-Pentamethyleneoxaziridine
作者:Michael Pätzel、Jürgen Liebscher、Siegfried Andreae、Ernst Schmitz
DOI:10.1055/s-1990-27097
日期:——
Semicyclic thioacylamidines 1 react with 3,3-pentamethyleneoxaziridine by ring transformation affording novel Ï-aminoalkyl-1,2,4-thiadiazoles 5, which are conveniently isolated as hydrochlorides 6. These can be transformed to the corresponding free bases 5, which in one case are methylated at the amino group to give an Ï-dimethylaminoalkyl-1,2,4-thiadiazole 7.
半环硫代酰基脒 1 通过环转化与 3,3-五亚甲基氧氮杂环丙烷反应,得到新型 α-氨基烷基-1,2,4-噻二唑 5,可以方便地以盐酸盐 6 的形式分离。这些可以转化为相应的游离碱 5,其在一种情况是在氨基处被甲基化,得到α-二甲基氨基烷基-1,2,4-噻二唑7。