Studies on the Reaction of Diimines with Thiourea: Synthesis and Solvent-Induced cis/trans-Isomerization of 1,3,5-Triazinane-2-thiones
作者:Babak Kaboudin、Tahereh Ghasemi、Tsutomu Yokomatsu
DOI:10.1055/s-0029-1216884
日期:2009.9
The reaction of N,N′-bis(arylmethylidene)arylmethane diimines with thiourea under reflux in methanol was studied. The reaction gave a diastereomeric mixture of 4,6-disubstituted 1,3,5-triazinane-2-thiones in good yields. Two diastereoisomers of 4,6-diphenyl-1,3,5-triazinane-2-thione were detected in a solution of CDCl3 by NMR analysis. According to the NMR studies, the cis-diastereoisomer undergoes a solvent-induced cis/trans-isomerization process, producing the trans-diastereoisomer in DMSO. The stereochemistry of the trans-diastereoisomer was determined by X-ray crystallographic analysis.
研究了N,N′-双(芳基甲烯基)芳基亚胺与硫脲在甲醇中回流反应。该反应得到了4,6-二取代1,3,5-三嗪烷-2-硫酮的二消旋体混合物,收率良好。通过NMR分析,在CDCl3溶液中检测到了4,6-二苯基-1,3,5-三嗪烷-2-硫酮的两个二消旋异构体。根据NMR研究,顺式二消旋异构体经历了一个溶剂诱导的顺/反异构化过程,在DMSO中生成反式二消旋异构体。反式二消旋异构体的立体化学通过X射线晶体学分析确定。