Synthèse de cétones α, α′-fonctionnalisées puis d'aldéhydes α-énols par ouverture des α-cyano α-hydroxyméthyl époxydes.
摘要:
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.
Reduction selective par le borohydrure de sodium d'un groupe ester ou nitrile dans les epoxydes gem disubstitues par deux croupes attracteurs d'electrons
Simple selective reduction by sodium borohydride of an ester or a cyano group of α-cyano epoxides
作者:Jacques Mauger、Albert Robert
DOI:10.1039/c39860000395
日期:——
Sodiumborohydridereduced the estergroup of epoxide (1) or one cyano group of (2) selectively within 5 min to give new hydroxy- or amino-functionalized epoxides.