3-Mercaptopropionic acid–nitrile imine adducts. An unprecedented cyclization into 1,3,4-thiadiazol-2(3H)-ones and -2(3H)-thiones
作者:Jalal A. Zahra、Bassam A. Abu Thaher、Mustafa M. El-Abadelah、Roland Boese
DOI:10.1039/b505010c
日期:——
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。