申请人:Schering AG
公开号:US04113733A1
公开(公告)日:1978-09-12
5-amino-1,2,3-thiadiazoles of the formula ##STR1## are made by reacting halogenoacetaldehydes of the formula X--CH.sub.2 --CH.dbd.O II with hydrazine derivatives of the formula H.sub.2 N--NH--COR III preferably in an aqueous medium or in a mixture of an aqueous medium with organic solvents so as to form acylhydrazones of the formula X--CH.sub.2 --CH.dbd.N--CH--CO--R IV whereupon the latter are reacted with thionylchloride of the formula SOCl.sub.2 V whereby 5-halogeno-1,2,3-thiadiazoles are formed which are then reacted with ammonia preferably in the presence of a catalyst such as a mineral acid or Lewis acid whereby the desired product is obtained. The products are useful in making plant protection agents and herbicides such as the 1,2,3-thiadiazolyl-urea derivatives.
式##STR1##的5-氨基-1,2,3-噻二唑可通过将式X-CH.sub.2-CH.dbd.O II的卤代乙醛与式H.sub.2N-NH-COR III的腙衍生物在水介质或水介质与有机溶剂混合物中反应制得。这样可以形成式X-CH.sub.2-CH.dbd.N-CH-CO-R IV的酰肼,然后再与式SOCl.sub.2 V的氯化硫酰反应,形成5-卤代-1,2,3-噻二唑。接着,在催化剂的作用下,例如矿物酸或路易斯酸的存在下,将5-卤代-1,2,3-噻二唑与氨反应,即可得到所需的产物。这些产物可用于制备植物保护剂和除草剂,例如1,2,3-噻二唑基脲衍生物。