Synthesis and biological activity of 5-substituted-2-amino-1,3,4-oxadiazole derivatives
作者:SANJEEV KUMAR
DOI:10.3906/kim-0908-177
日期:——
Electrical energy offers numerous benefits for performing synthesis, including increased reaction rates, enhanced yields, and cleaner chemistries. 5-Substituted-2-amino-1,3,4-oxadiazoles were synthesized directly from the semicarbazone at a platinum electrode under controlled potential electrolysis in an undivided cell assembly in acetonitrile. The compounds were screened for antibacterial and antifungal activity against Staphylococcus aureus, Klebsiella pneumoniae, Pellicularia salmonicolor, and Macrophomina phaseolina.
Mild and convenient one-pot synthesis of 2-amino-1,3,4-oxadiazoles promoted by trimethylsilyl isothiocyanate (TMSNCS)
作者:Dinneswara Reddy Guda、Hyeon Mo Cho、Myong Euy Lee
DOI:10.1039/c3ra41044g
日期:——
A mild, convenient, and efficient one-pot synthesis of amino-1,3,4-oxadiazoles is described. In situ preparation of various thiosemicarbazides by the reaction of different carboxylic acid hydrazides with trimethylsilyl isothiocyanate (TMSNCS), followed by cyclodesulfurization of thiosemicarbazides under basic conditions in the presence of I2/KI resulted in 2-amino-1,3,4-oxadiazoles in high yields (79–94%).
Synthesis of N-pyrimidin[1,3,4]oxadiazoles and N-pyrimidin[1,3,4]-thiadiazoles from 1,3,4-oxadiazol-2-amines and 1,3,4-thiadiazol-2-amines via Pd-catalyzed heteroarylamination
An efficient and practical procedure was developed to prepare various N-pyrimidin[1,3,4]oxadiazole and thiadiazole scaffolds using a Buchwald-type coupling. The products of this reaction are otherwise difficult to access and could be used as building blocks in drug design. (C) 2019 Published by Elsevier Ltd.
Gehlen; Braasch, Justus Liebigs Annalen der Chemie, 1955, vol. 597, p. 157,165