Y(OTf)3-Catalyzed Cascade Propargylic Substitution/Aza-Meyer–Schuster Rearrangement: Stereoselective Synthesis of α,β-Unsaturated Hydrazones and Their Conversion into Pyrazoles
作者:Baoguo Li、Shufeng Chen、Wenfei Liu、Han Wang、Haiying Zhao
DOI:10.1055/s-0034-1381057
日期:——
concise method for the highly stereoselective synthesis of α,β-unsaturated hydrazones by the Y(OTf)3-catalyzed cascade propargylic substitution/aza-Meyer–Schuster rearrangement reaction of tertiary propargylic alcohols and p-toluenesulfonyl hydrazide under an air atmosphere is developed. A series of α,β-unsaturated hydrazones have been synthesized from simple and readily available starting materials
在空气气氛下,通过 Y(OTf)3 催化的炔丙醇和对甲苯磺酰肼的级联炔丙基取代/氮杂-迈耶-舒斯特重排反应,高度立体选择性地合成 α,β-不饱和腙的简单明了的方法被开发。一系列 α,β-不饱和腙已由简单易得的起始原料以良好的产率合成。此外,获得的 α,β-不饱和腙在 LiOt-Bu 存在下转化为吡唑。