Preparation of enantiomerically pure (E)-β-sulfinylenones from β-ketoesters
摘要:
Enantiomerically pure (E)-beta-sulfinylenones are smoothly prepared from beta-ketoesters in three steps with good overall yield. Since they can be the substrates of many diastereoselective reactions, they represent versatile precursors of a wide range of chiral building blocks. We propose a rationale to explain the formation of (E)-beta-sulfinylen ones from the corresponding delta-enol-methylethers. (c) 2005 Elsevier Ltd. All rights reserved.
Ring-opening of lactones with enolate nucleophiles: a simple access to functionalised β-ketoesters, β,δ-diketoesters and β-ketosulfoxides
摘要:
gamma-, delta- and epsilon-Lactones are readily opened by stabilised carbanions to the corresponding bis- or tris-silyl ethers, which can be selectively cleaved to 5- 6- or 7-silyloxy-3-ketoesters, 3,5-diketoesters, or 2-ketosulfoxides. (C) 2004 Elsevier Ltd. All rights reserved.
Amine-Induced Michael/Conia-Ene Cascade Reaction: Application to a Formal Synthesis of (±)-Clavukerin A
作者:Wei Li、Xiaozu Liu、Xiongfei Zhou、Chi-Sing Lee
DOI:10.1021/ol902567e
日期:2010.2.5
An efficient and versatile amine-induced Michael/Conia-ene cascade cyclization reaction has been developed for establishing 6,6- and 5,7-bicyclic fused carbocycles with simple acyclic β-ketoesters as the substrates in one-pot condition and this new cyclization method has been successfully utilized in a formal synthesis of (±)-Clavukerin A.