Mild Synthesis of Substituted 1,2,5-Oxadiazoles Using 1,1′-Carbonyldiimidazole as a Dehydrating Agent
作者:Andrew J. Neel、Ralph Zhao
DOI:10.1021/acs.orglett.8b00568
日期:2018.4.6
variety of 3,4-disubstituted 1,2,5-oxadiazoles (furazans) from the corresponding bisoximes at ambient temperature. This method enables these inherently energetic compounds to be prepared at temperatures well below their decomposition points and with improved functional group compatibility relative to prior methods. Conditions were developed that allowed for the first high-yielding synthesis of chlorofurazans
Benzamidoxime and cyanic acid react to give O-carbamoyl-benzamidoxime, and not the oxime of benzoylurea as generally admitted. 3-Phenyl-5-hydroxy-l,2,4-oxa-diazole is quantitatively formed by reacting hydroxylamine on carbamoylbenzami-dine.