Unusual and efficient (Z)-stereoselective peterson synthesis of 2-diethoxyphosphonyl-1-alkoxy-3-methylpenta-1,3-dienes. Their use in the diels-alder reaction
作者:Hashim Al-Badri、Elie About-Jaudet、Noël Collignon
DOI:10.1016/0040-4039(96)00452-2
日期:1996.4
The lithiated anion of diethyl α-trimethylsilyl-prenylphosphonate, readily in situ generated from diethyl prenylphosphonate, reacts smoothly with various alkyl formates to give the title compounds with exclusive 1-(Z)-geometry and in high isolated yield. The [4 + 2] cycloaddition reaction of dienes 3 with electron-deficient dienophiles is described.
α-三甲基甲硅烷基异戊二烯基膦酸二乙酯的锂化阴离子易于原位生成,由二乙基异戊二烯基膦酸酯与各种烷基形式平稳反应,得到具有独特的1-(Z)几何形状且分离产率高的标题化合物。描述了二烯3与缺乏电子的亲二烯体的[4 + 2]环加成反应。