Under microwave irradiation 3Å molecular sieves promote the oxidation of secondary (linear and cyclic) and benzylic alcohols to the corresponding carbonyl compounds by t-butylhydroperoxide. Under the same conditions, α,β-unsaturated alcohols are converted into α,β-epoxyalcohols in regio- and diastereoselective way. Both oxidative processes can be performed under solvent-free conditions; however, epoxidation
Stereoselective expoxidation of allylic and homoallylic alcohols with 30% hydrogen peroxide catalyzed by tungstic acid in buffered media
作者:Denis Prat、Bernard Delpech、Robert Lett
DOI:10.1016/s0040-4039(00)84080-0
日期:1986.1
The aqueous tungstic acid-catalyzed hydrogenperoxideepoxidation of allylicalcohols affords the same major diastereoisomer as the VO(acac)2/tBuOOH system with quite comparable stereoselectivities. In contrast, epoxidation of homoallylic alcohols appears to be much less stereoselective.
[EN] PROCESSES FOR HIGHLY ENANTIO-AND DIASTEREOSELECTIVE SYNTHESIS OF ACYCLIC EPOXY ALCOHOLS AND ALLYLIC EPOXY ALCOHOLS<br/>[FR] PROCEDES DE SYNTHESE HAUTEMENT ENANTIOSELECTIVE ET DIASTEREOSELECTIVE D'EPOXYALCOOLS ACYCLIQUES ET D'EPOXYALCOOLS ALLYLIQUES
申请人:UNIV PENNSYLVANIA
公开号:WO2005087755A1
公开(公告)日:2005-09-22
The inventive subject matter relates to novel processes for making an epoxy alcohol from an aldehyde, comprising the steps of: (a) adding (i) an organozinc compound or (ii) divinylzinc compound and an diorganozinc compound to said aldehyde in the presence of a first catalyst to form an allylic alkoxide compound; and (b) epoxidizing said allylic alkoxide compound in the presence of an oxidant and a second catalyst.
The title complex oxidizes primary and secondary alcohols to the corresponding carbonyl compounds. Stereoselective epoxidation of allylic alcohols is also described.