A New Annulation Reagent, 2-Oxo-3-alkenylphosphonates. Reactions with Carbonyl-Stabilized Carbanions or Silyl Enol Ethers Leading to Cyclohexenones
作者:Eiji Wada、Junji Funakoshi、Shuji Kanemasa
DOI:10.1246/bcsj.65.2456
日期:1992.9
The reactions of 2-oxo-3-alkenylphosphonates with carbonyl-stabilized carbanions directly lead to 2-cyclohexen-1-ones through a sequence of Michael reaction and intramolecular Horner–Emmons olefination. On the other hand, the Lewis acid-mediated reactions with silyl enol ethers produce 1,5-diketones as Michael adducts, which then undergo cyclization on treatment with sodium hydride or triethylamine/zinc
2-oxo-3-alkenylphosphonates 与羰基稳定的碳负离子的反应通过一系列 Michael 反应和分子内 Horner-Emmons 烯化直接导致 2-cyclohexen-1-ones。另一方面,路易斯酸介导的与甲硅烷基烯醇醚的反应产生 1,5-二酮作为迈克尔加合物,然后在用氢化钠或三乙胺/溴化锌 (II) 处理后进行环化,得到 2-环己烯-1-或 2-phosphinyl-2-cyclohexen-1-ones,分别。