Synthesis of fused 1,2,4-thiadiazolines by intramolecular cycloaddition-elimination reactions of 4-methyl-5-(cyano tethered)imino-Δ2-1,2,3,4-thiatriazolines
作者:Gerrit L'abbé、Stefan Leurs
DOI:10.1016/s0040-4020(01)90364-3
日期:1992.9
A series of 5-imino-1,2,3,4-thiatriazolines, bearing a cyano tether at the imine function, were prepared and converted into fused 1,2,4-thiadiazole derivatives by thermolysis; these are 12a → 13, 20a → 21, 20b → 22 and 29 → 30 (Schemes 2–5). In one case, the precursor thiatriazole also underwent an intramolecular cycloaddition-elimination reaction to give a fused 1,2,4-thiadiazole; namely 17a → 18
制备了一系列在亚胺官能团上带有氰基链的5-亚氨基-1,2,3,4-噻唑啉,并通过热解将其转化为稠合的1,2,4-噻二唑衍生物。它们是12a→13、20a→21、20b→22和29→30(方案2-5)。在一种情况下,前体噻三唑还进行了分子内环加成消除反应,得到稠合的1,2,4-噻二唑;即17a→18。具有直接连接到亚胺官能团上的芳基的噻唑啉33被热解到苯并噻唑34上。