The synthesis of (Z)-penta-2,4-dien-1-ol and substituted (E)-pentadienols by the stereochemically controlled Horner–Wittig reaction
摘要:
Acylation of Ph2P(O)Me with a lactone gives a Horner-Wittig intermediate with a Z-double bond protected as a Diels-Alder adduct with furan and hence (Z)-penta-2,4-dien-1-ol. Substituted (E)-penta-2,4-dien-1-ols are available by a more general route involving addition of enals to phosphine oxides, a regiochemically controlled allylic alcohol transposition, and a Horner-Wittig reaction. The geometry of only one double bond can be controlled.
The synthesis of (Z)-penta-2,4-dien-1-ol and substituted (E)-pentadienols by the stereochemically controlled Horner–Wittig reaction
摘要:
Acylation of Ph2P(O)Me with a lactone gives a Horner-Wittig intermediate with a Z-double bond protected as a Diels-Alder adduct with furan and hence (Z)-penta-2,4-dien-1-ol. Substituted (E)-penta-2,4-dien-1-ols are available by a more general route involving addition of enals to phosphine oxides, a regiochemically controlled allylic alcohol transposition, and a Horner-Wittig reaction. The geometry of only one double bond can be controlled.
Stereochemical control (E/Z and syn/anti) by the diphenylphosphinoyl group in the synthesis of allylic alcohols by allylic rearrangement and by 1,4-diastereoselective reduction of enones
作者:Jonathan Clayden、Eric W. Collington、Jason Elliott、Stephen J. Martin、Andrew B. McElroy、Stuart Warren、David Waterson
DOI:10.1039/p19930001849
日期:——
Allylic rearrangement of substitued 2-hydroxyalk-3-en-1-yl(diphenyl)phosphine oxides to 4-hydroxyalk-2-en-1-yl(diphenyl)phosphine oxides can be performed with total regio- and reasonable stereochemicalcontrol. Alternatively, the reduction of substituted 4-diphenylphosphinoylbut-2-en-1 -ones shows remarkable 1,4-diastereoselectivity. All these reactions are directed by the diphenylphosphinoyl (Ph2PO)
Transposition of allylic alcohols controlled by the Ph2PO group: Reagents for α-hydroxy-diene synthesis by the horner-wittig reaction
作者:Paul S. Brown、Andrew B. McElroy、Stuart Warren
DOI:10.1016/s0040-4039(00)61892-0
日期:1985.1
4-Hydroxy-2-alkenyldiphenylphosphine oxides, prepared by a phosphorus-controlled allylic rearrangement, give dianions and hence α-hydroxydienes (substituted penta-2,4-dienols) by the Horner-Wittig reaction.