Base-mediated one-pot synthesis of 1,2,4-oxadiazoles from nitriles, aldehydes and hydroxylamine hydrochloride without addition of extra oxidant
作者:Wei Wang、Hao Xu、Yuanqing Xu、Tao Ding、Wenkai Zhang、Yanrong Ren、Haibo Chang
DOI:10.1039/c6ob01794k
日期:——
A simple base-mediated one-pot synthesis of 3,5-disubstituted 1,2,4-oxadiazoles from nitriles, aldehydes and hydroxylamine hydrochloride has been developed, in which the aldehydes act as both substrates and oxidants. The reactions include three sequential procedures: base-promoted intermolecular addition of hydroxylamine to nitrile to lead to amidoxime, treatment of the amidoxime with an aldehyde to
已经开发了由腈,醛和盐酸羟胺形成的简单的碱介导的一锅法合成3,5-二取代的1,2,4-恶二唑,其中醛既充当底物又充当氧化剂。反应包括三个顺序程序:碱促进的羟胺分子间加成到腈中以生成a胺肟;用醛处理the胺肟以形成4,5-二氢-1,2,4-恶二唑;以及氧化4, 5-二氢-1,2,4-恶二唑通过使用另一种醛得到1,2,4-恶二唑。该方法代表了合成3,5-二取代的1,2,4-恶二唑的直接而简单的方法。