A simple and direct synthesis of α-hydroxy unsaturated aldehydes from α-cyano-α-hydroxymethyl epoxides
作者:Layachi Khamliche、Albert Robert
DOI:10.1039/c39870001869
日期:——
The ring opening of α-cyano-α-hydroxymethylepoxides by a solution of the complex Li2NiBr4 in tetrahydrofuran leads to α-bromo-α′-hydroxy ketones which in treatment with pyridine give good yields of α-hydroxyunsaturatedaldehydes.
Synthèse de cétones α, α′-fonctionnalisées puis d'aldéhydes α-énols par ouverture des α-cyano α-hydroxyméthyl époxydes.
作者:K. Layachi、I. Ariès-Gautron、M. Guerro、A. Robert
DOI:10.1016/s0040-4020(01)88717-2
日期:1992.2
Two synthetic routes to alpha-enol aldehydes are described. Monosubstituted alpha-enol aldehydes are obtained via Li2NiBr4/THF, ring opening of the trisubstituted alpha-cyano alpha-hydroxymethyl epoxides while disubstituted alpha-enol aldehydes are prepared through HX opening of the corresponding tetrasubstituted epoxide alcohols protected as acetate, followed by Ni(OAc)2 decyanation of the intermediate cyanhydrins and by NaOAc deprotection of the formed alpha,alpha'-functionalized ketones.
KHAMLICHE, LAYACHI;ROBERT, ALBERT, J. CHEM. SOC. CHEM. COMMUN.,(1987) N 24, 1869-1870