A challenging synthesis of new 1,3,4-thiadiazole derivatives starting from 2-acylamino-3,3-dichloroacrylonitriles
作者:Oleksandr V. Golovchenko、Stepan G. Pilyo、Vladimir S. Brovarets、Alexander N. Chernega、Boris S. Drach
DOI:10.1002/hc.20041
日期:——
Available 2-acylamino-3,3-dichloroacrylonitriles, when treated with hydrazine hydrate, provide 2-alkyl- or 2-aryl-5-hydrazino-1,3-oxazole-4-carbonitriles that readily add alkyl or aryl isothiocyanates and the adducts formed recyclize on heating. Finally, the synthesis results in 5-alkyl(aryl)amino-1,3,4-thiadiazol-2-yl(acylamino)acetonitriles or the products of their further cyclization, 2-(5-amino-1
可用的 2-acylamino-3,3-dichloroacrylonitriles,当用肼水合物处理时,可提供 2-烷基-或 2-芳基-5-肼基-1,3-恶唑-4-腈,可轻松添加烷基或芳基异硫氰酸酯和加合物形成循环加热。最后,合成产生 5-烷基(芳基)氨基-1,3,4-噻二唑-2-基(酰基氨基)乙腈或其进一步环化的产物,2-(5-氨基-1,3-恶唑- 2-基)-1,3,4-噻二唑衍生物。新型取代的 1,3,4-噻二唑的结构通过光谱和 X 射线衍射方法得到证实。© 2004 Wiley Periodicals, Inc. 杂原子化学 15:454–458, 2004; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.20041