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 Grignard reagents (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
在低温下在催化量(2.5%当量)的碘化亚铜存在下,用格氏试剂(伯,仲,叔烷基,乙烯基,芳基)取代功能性烯丙基环烯醇乙酸酯,可获得高产率的各种功能性α-取代的环烯烃。该反应可以应用于酯的烯醇锂,并且不需要催化剂,但是可以在HMPA作为助溶剂的情况下进行。它是由2,5-二甲氧基四氢呋喃完成的短(6步)高效有效的全选择性合成(±)-mitsugashiwalactone的例证,总收率为33%。