A Convenient Synthesis of 4-(2,2-Dichloroethenyl)-5,5-dimethyltetrahydro-2-furanone Derivatives, a Key Intermediate of Permethrinic Acid
作者:Sadao Tsuboi、Eiichiro Amano、Akira Takeda
DOI:10.1246/bcsj.57.802
日期:1984.3
A key intermediate of 2-(2,2-dichloroethenyl)-3,3-dimethylcyclopropanecarboxylic acid, 3-alkoxycarbonyl(or acyl)-4-(2,2-dichloroethenyl)-5,5-dimethyltetrahydro-2-furanone was prepared by the base-catalyzed condensation of 2-methyl-3,5,5-trichloro-4-penten-2-ol with acetate derivatives such as malonic esters, acetoacetic esters, and benzoylacetate. The reactivity of 3-acetyl-4-(2,2-dichloroethenyl)-5
制备了2-(2,2-二氯乙烯基)-3,3-二甲基环丙烷甲酸、3-烷氧基羰基(或酰基)-4-(2,2-二氯乙烯基)-5,5-二甲基四氢-2-呋喃酮的关键中间体通过 2-甲基-3,5,5-三氯-4-戊烯-2-醇与乙酸衍生物如丙二酸酯、乙酰乙酸酯和苯甲酰乙酸酯的碱催化缩合。还检测了 3-乙酰基-4-(2,2-二氯乙烯基)-5,5-二甲基四氢-2-呋喃酮对过量亚硫酰氯在乙醇中的反应性。类似物5-丁基-4-(2,2-二氯乙烯基)-3-乙氧基羰基-5-甲基四氢-2-呋喃酮也以31%的产率制备。