Efficient Asymmetric Synthesis of Chiral Hydroxy-γ-butyrolactones
作者:Iwan R. Davies、Matt Cheeseman、Rachel Green、Mary F. Mahon、Andrew Merritt、Steven D. Bull
DOI:10.1021/ol9008365
日期:2009.7.2
Treatment of β-vinyl-β-hydroxy-N-acyloxazolidin-2-ones with VO(acac)2 and tert-butyl hydroperoxide results in formation of unstable epoxides that are ring-opened by intramolecular nucleophilic attack of their exocyclic carbonyl fragments to afford highly functionalized trisubstituted hydroxy-γ-butyrolactones in >95% de, with a polymer-supported oxazolidin-2-one having been used to transfer this methodology
A temporary stereocentre approach for the asymmetric synthesis of chiral cyclopropane-carboxaldehydes
作者:Matt Cheeseman、Iwan R. Davies、Phil Axe、Andrew L. Johnson、Steven D. Bull
DOI:10.1039/b908600e
日期:——
A novel way of combining chiral auxiliaries and substrate directable reactions is described that employs a three-step sequence of aldol/cyclopropanation/retro-aldol reactions for the asymmetric synthesis of enantiopure cyclopropane-carboxaldehydes. In the first step, reaction of the boron enolate of (S)-N-propionyl-5,5-dimethyl-oxazolidin-2-one with a series of α,β-unsaturated aldehydes affords their
A novel strategy for the asymmetric synthesis of chiral cyclopropane carboxaldehydes
作者:Matt Cheeseman、Fred J. P. Feuillet、Andrew L. Johnson、Steven D. Bull
DOI:10.1039/b501847a
日期:——
A new way of combining chiral auxiliaries and substrate-directable reactions for asymmetricsynthesis is described that employs a three-step sequence of aldol-cyclopropanation-retro-aldol reactions for the stereoselective synthesis of enantiopure cyclopropane carboxaldehydes.