Substitution nucleophile d'acetates de cyclenols allyliques fonctionnels par des organometalliques en presence de sels cuivreux. Application a une synthese rapide de la (±)mitsugashiw alactone
作者:Hassen Amri、Monique Rambaud、Jean Villieras
DOI:10.1016/s0040-4020(01)81522-2
日期:1990.1
Substitution of functional allylic cycloalkenol acetates by Grignardreagents (primary , secondary, tertiary-alkyl, vinyl, aryl) in the presence of a catalytic amount (2.5% equivalent) of cuprous iodide at low temperature, gives high yields of various functional α-substituted cycloalkenes . The reaction can be applied to lithium enolates of esters and need no catalyst, but may be performed with HMPA
Alkylation d'acetates de cyclenols fonctionnels (5 et 6 chainons) par les reactifs de grignard et les enolates lithiens catalysee (ou non) par les sels de cuivre (I). Synthese rapide de la (±) mitsugashiwalactone
作者:H. Amri、J. Villieras
DOI:10.1016/s0040-4039(00)96769-8
日期:1987.1
Substitution of 1-ethoxycarbonyl n-hydroxycycloalkenes acetates and silyl ethers (n = 5, 6) by GRIGNARDreagents in the presence of cuprous salt as a catalyst or lithium ester enolates (without catalyst) gives rise to various 1-carbethoxy alkylcycloalkenes. It is applied to a new short stereoselective synthesis of (±) Mitsugashiwalactone (6 steps - 27 % global yield) from a succinaldehyde precursor