将苯并咪唑-2-硫酮与乙炔二甲酸二甲酯(DMAD)在乙腈中混合,得到稠合的噻唑烷酮衍生物,但在甲醇中,得到了稠合的噻嗪酮。通过与这些化合物的13 C nmr光谱比较,将结构分配给其他硫脲的加合物。已开发出一种使用1 H和13 C nmr光谱技术来区分DMAD与胍和am衍生物的加合物可能的结构类型的方法。从各种硫代酰胺和DMAD的产物通过其核磁共振谱和其他光谱进行鉴定。
N, N '-dimethylthiourea reacts with dialkyl acetylenedicarboxylates in acetone to form 1: 1 adducts, which undergo a cyclization reaction to produce alkyl (Z)2-[3-methyl-2-(methylimino)-4-oxo-1,3-thiazolan-5-yliden] acetates, in fairly good yields. The reaction is completely stereoselective. The toxicity effects of the products against protozoan (Euplots) in the culture were investigated.