SYNTHESIS OF 5-ARYL-1,3,4-OXADIAZOLYL-2-ACETIC ACIDS
作者:Lubomir Janda
DOI:10.1515/hc.2001.7.5.411
日期:2001.1
anhydrous ethanol. Introduction Heteroaryl acetic acids often posses anti-inflammatory and analgesic activities 1,2 and are used in the synthesis of new beta-lactam antibiotics with anti-microbial activity.' Aryloxadiazolyl acetic acids and their derivatives are no exception and their biological activities are well known. ' The previously described multistep syntheses of aryloxadiazolylacetic acids are based
Formal [4+1] cyclization of (thio/imido)hydrazides and ethyl 3,3,3-trifluoropropanoate: unified synthesis of 1,3,4-oxadiazoles, 1,3,4-thiadiazoles and 1,2,4-triazoles
作者:Lan Zhao、Jun Xu、Jun Ma、Guangwei Yin、Fangyi Li、Tongchuan Suo、Chunhua Wang
DOI:10.1039/d2nj04147b
日期:——
Here we report an efficient and practical one-step synthesis of a series of 1,3,4-oxadiazoles with ethyl ester decoration, which was accomplished by the formal [4+1] cyclization of hydrazides and commercially available ethyl 3,3,3-trifluoropropanoate. In contrast to previously reported synthetic processes, this method features operational simplicity, easy scalability and good substrate tolerability