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.
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.
Preparation of enantiomerically pure (E)-β-sulfinylenones from β-ketoesters
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.