Rearrangement of Derivatives of 1,3-Dithian-5-amineinto Bicyclic 2-Thiazolidines. Crystal Structures of<i>cis</i>- and<i>trans</i>-1-(2-Aryl-1,3-dithain-5-yl)-2-thioureas and<i>cis</i>- and<i>trans</i>-5-Aryl-3-imino-7,7a-dihydro-1<i>H</i>,3<i>H</i>,5<i>H</i>-thiazolo[3,4-<i>c</i>]thiazoles
作者:Janos Borgulya、John J. Daly、Peter Schönholzer、Kerl Bernauer
DOI:10.1002/hlca.19840670720
日期:1984.11.7
Under conditions normally applied to transform thioureas into the corresponding carbodiimides, cis- and trans-1-(2-aryl-1,3-dithian-5-yl)-2-thioureas 7 and 8 undergo a rearrangement to 5-aryl-3-imino-7,7a-dihydro-1H, 3H, 5H-thiazolo[3,4-c]thiazoles 9/10 with cis- and trans-fused rings, respectively. The structures of these novel heterocycles were established by X-ray analysis of compounds 9a, 9d, and
在通常用于将硫脲转化成相应的碳二亚胺的条件下,顺式和反式-1-(2-芳基-1,3-二硫基-5-基)-2-硫脲7和8进行重排成5-芳基-3 -亚氨基-7,7a-二氢-1 H,3 H,5 H-噻唑并[3,4- c ]噻唑9/10,分别具有顺式和反式稠环。这些新型杂环的结构是通过对化合物9a,9d和10d进行X射线分析确定的。该顺式-融合化合物9是热力学上更稳定的。重排的立体化学结果取决于芳基部分的碳鎓离子稳定能力和所用试剂系统。在Ar = Ph,p -Cl-Ph,p - O 2 N-Ph的情况下,可以指导反应主要递送顺式-噻唑并噻唑9或反式-噻唑并噻唑10。当Ar = 5-甲基-4-咪唑基或p -Me 2 N-Ph时,形成顺-噻唑并噻唑(9a和9b,分别)是独立于反应条件的强烈拥护者,与此相反,2-芳基类似物可以将(1,3-dithian-5-yl)-2-thiourea 7g转化为碳二亚胺1