3-Mercaptopropionic acidânitrile imine acyclic adducts (6aâc) undergo cyclocondensation with 1,1â²-carbonyldiimidazole to afford the respective 1,3,4-thiadiazol-2-(3H)-ones (7aâc). Corresponding 1,3,4-thiadiazol-2(3H)-thiones (8aâc) were likwise produced from 6aâc and 1,1â²-thiocarbonyldiimidazole, with consequent elimination of the propionate moiety. The constitution of these heterocyclic products follows from analytical and spectral data and is confirmed by single crystal X-ray structure determination for 7b.
3-巯基丙酸腈
亚胺无环加合物(6aâc)与 1,1â²-羰基二
咪唑发生环缩合反应,生成相应的 1,3,4-
噻二唑-2-(3H)-酮(7aâc)。相应的 1,3,4-
噻二唑-2-(3H)-
硫酮(8aâc)也是由 6aâc 和 1,1â²-
硫杂羰基二
咪唑通过消除
丙酸基生成的。根据分析和光谱数据可以得出这些杂环产品的结构,7b 的单晶 X 射线结构测定结果也证实了这一点。