Favorskii-Type Rearrangement of α,α′-Dihalo Ketones Induced by Enolates of (Diethoxyphosphinyl)acetic Esters and Its Application to the Synthesis of α,α′-Divinyl Ketones
作者:Takashi Sakai、Eiichiro Amano、Kazuyoshi Miyata、Masanori Utaka、Akira Takeda
DOI:10.1246/bcsj.60.1945
日期:1987.5
A Favorskii-type rearrangement of 1,3-dihalo-3-methyl-2-butanone with enolate of ethyl (diethoxyphosphinyl)acetate or t-butyl (diethoxyphosphinyl)acetate gave ethyl 2-(diethoxyphosphinyl)-5-methyl-3-oxo-4-hexenoate (3a) or its t-butyl ester (3b). Compound 3b was applied to the preparation of (E)-5-methyl-1-(p-tolyl)-1,4-hexadien-3-one and diethyl (4-methyl-2-oxo-3-pentenyl)phosphonate, which are the important intermediates for natural product syntheses.
1,3-二卤-3-甲基-2-丁酮与乙基(二乙氧基膦酰基)乙酸酯或叔丁基(二乙氧基膦酰基)乙酸酯的烯醇酸盐进行Favorskii型重排,得到乙基2-(二乙氧基膦酰基)-5-甲基-3-氧代-4-己烯酸酯(3a)或其叔丁酯(3b)。化合物3b被用于制备(E)-5-甲基-1-(对甲苯基)-1,4-己二烯-3-酮和二乙基(4-甲基-2-氧代-3-戊烯基)膦酸酯,这些是天然产物合成中的重要中间体。