Efficient Synthesis of 1‐(5′‐Acylamino‐1′,3′,4′‐thiadiazol‐2′‐yl)‐4‐acyl‐thiosemicarbazides
作者:Zheng Li、Jing‐Ya Yang、Xi‐Cun Wang
DOI:10.1080/00397910600640164
日期:2006.8
Abstract Acyl chlorides reacted with ammonium thiocyanate and carbonic dihydrazide under phase‐transfer catalysis to first afford 2,2′‐bis(acylaminothiocarbonyl)‐carbonic dihydrazides, which further cyclized in the presence of glacial acetic acid to efficiently give 1‐(5′‐acylamino‐1′,3′,4′‐thiadiazol‐2′‐yl)‐4‐acyl‐thiosemicarbazides in high yield.
摘要 酰氯在相转移催化下与硫氰酸铵和碳酸二酰肼反应,首先得到 2,2'-双(酰氨基硫代羰基)-碳酸二酰肼,然后在冰醋酸存在下进一步环化,有效地得到 1-(5'-酰氨基-1',3',4'-噻二唑-2'-基)-4-酰基-氨基硫脲的高产率。