AbstractA highly stereoselective synthesis of E-isomer of aldoximes was developed through a base-catalysed domino aza-Michael/retro-Michael reaction of hydroxylamine and 2-(R-benzylidene)malononitrile. This reaction generates (E)-aldoxime diastereomer in high yields (eight examples, isolated yields of 82-93 %), excellent diastereomeric purity (diastereomeric ratio higher than 95: 5 by 1H NMR), and proceeds under mild reaction conditions (aqueous NaOH, pH 12, room temperature, 4 h).
一个高度立体选择性的合成E-异构体的aldoximes已经通过氢氧胺和2-(R-苄亚甲基)丙二腈的碱催化多米诺aza-Michael/retro-Michael反应开发出来。这个反应以高产率生成(E)-aldoxime对映异构体(八个例子,分离产率为82-93%),具有优秀的对映纯度(通过1H NMR,对映比高于95:5),并在温和的反应条件下进行(水性NaOH,pH 12,室温,4小时)。