A Facile Method for the Synthesis of Hydrazine-4-oxothiazolidine and Imino-5-oxothiadiazine Derivatives from 1,4-Disubstituted Thiosemicarbazides
作者:Alaa A. Hassan、Ashraf A. Aly、Tarek I. M. Bedair、Alan B. Brown、Talaat I. El-Emary
DOI:10.1002/jhet.1655
日期:2014.1
1,4‐Disubstituted thiosemicarbazides reacted with dimethyl acetylenedicarboxylate with formation of (2‐hydrazono‐4‐oxothiazolidin‐5‐ylidene)acetates and, in one case, a (2‐imino‐1,3,4‐thiadiazin‐5‐on‐6‐ylidene)acetate. Several mechanistic options involving nucleophilic interaction are presented. The structures of all newly synthesized compounds were identified by 1H NMR, 13C NMR, COSY, HMQC and HMBC
1,4-二取代的硫代氨基脲与乙炔二甲酸二甲酯反应生成(2-肼基-4-氧杂噻唑啉-5-吡咯)乙酸酯,在一种情况下还生成(2-亚氨基-1,3,4-噻二嗪-5-酮) -6-亚丙基)乙酸酯。介绍了涉及亲核相互作用的几种机理选择。通过1 H NMR,13 C NMR,COSY,HMQC和HMBC光谱数据鉴定所有新合成的化合物的结构。