Synthesis of 3,5-disubstituted 1,2,4-oxadiazoles using ionic liquid-phase organic synthesis (IoLiPOS) methodology
作者:Laetitia Duchet、Jean Christophe Legeay、Daniel Carrié、Ludovic Paquin、Jean Jacques Vanden Eynde、Jean Pierre Bazureau
DOI:10.1016/j.tet.2009.11.079
日期:2010.1
New 3,5-disubstituted 1,2,4-oxadiazoles were synthesized in five steps by ionic liquid-phase organic synthesis (IoLiPOS) methodology. The strategy involved the preparation of amidoxime from the ionic liquid-phase bound arylnitrile. Addition of various carboxylic acid to the amidoxime produced the expected 3,5-disubstituted 1,2,4-oxadiazoles via the stable O-acyl amidoxime intermediate grafted on the
通过离子液相有机合成(IoLiPOS)方法分五个步骤合成了新的3,5-二取代的1,2,4-恶二唑。该策略涉及从离子型液相键合的芳腈制备of胺肟。通过在离子液相上接枝的稳定的O-酰基a胺肟中间体,将各种羧酸加到various胺肟中产生了预期的3,5-二取代的1,2,4-恶二唑。1,2,4-恶二唑很容易在温和的反应条件下以高纯度,高收率通过酯交换反应裂解。通过常规光谱分析(1 H,13 C NMR和HRMS)验证每个步骤中中间体的结构。