Synthesis of -homoallylic alcohols, γ-hydroxyketones, and cyclopropyl ketones from 3-diphenylphosphinoyl (Ph2PO) propanols by acyl transfer
作者:Paul Wallace、Stuart Warren
DOI:10.1016/s0040-4039(01)80928-x
日期:1985.1
Carboxyl transfer (O→C) on 3-Ph2PO propyl esters (9) gives an intermediate (10) from which the Ph2PO group may be removed by the Horner-Wittig reaction or by Ph2PO transfer (C→O) to give the title compounds.
Asymmetric synthesis of trans-disubstituted cyclopropanes using phosphine oxides and phosphine boranes
作者:Celia Clarke、Stéphanie Foussat、David J. Fox、Daniel Sejer Pedersen、Stuart Warren
DOI:10.1039/b817433d
日期:——
The stereocontrolled synthesis of trans-disubstituted cyclopropylketones has been achieved from β-alkyl, γ-benzoyl phosphine oxides via a three-step cascade reaction incorporating an acyl transfer, phosphinoyl transfer and cyclisation to form the cyclopropane. Using Evans’ chiral oxazolidinone auxiliary and by masking the phosphine oxide moiety as a phosphine borane we have extended the method to the
The lithiation and acyl transfer reactions of phosphine oxides, sulfides and boranes in the synthesis of cyclopropanes
作者:Celia Clarke、David J. Fox、Daniel Sejer Pedersen、Stuart Warren
DOI:10.1039/b817436a
日期:——
sulfides readily undergo both phosphinoyl transfer and cyclopropane ring closure just like their phosphine oxide counterparts. The obtained data show that phosphine oxides are easily lithiated and undergo phosphoryl transfer much more readily and faster than phosphine sulfides and phosphine boranes. The observations suggest that it would be possible to perform reactions involving phosphine oxides in the presence
Synthesis of single isomers ( or ) of unsaturated alcohols by the horner-wittig reaction
作者:Antony D. Buss、Nicholas Greeves、Daniel Levin、Paul Wallace、Stuart Warren
DOI:10.1016/s0040-4039(00)99882-4
日期:1984.1
Single isomers (E or Z) of homoallylic and higher alcohols can be synthesised from ω-hydroxyalkyldiphenylphosphine oxides and aldehydes, or from alkyldiphenylphosphine oxides and lactones