β,β—双甲硫基—α,β—不饱和酮(或称α—羰基烯酮二甲硫缩醛)类化合物1是一类多官能团三碳合成子。1与烯丙基、苄基、炔丙基等具双亲核中心 Grignard试剂的加成产物在酸催化下的芳构化反应是1在合成中的重要应用之一。为研究缩醛基结构上的差异对反应性能的影响,我们对α—羰基烯酮环二硫代缩醛2的合成及其在合成上的应用做了一些探讨。本文合成了一些新的缩醛基为七元环的标题化合物2c1—c10,选择其中代表物2c1与烯丙基、2—甲基烯 β, β-bis-methylthio-α, β-unsaturated ketones (also known as α-carbonyl ketene dimethyl thioacetal) Compound 1 is a class of multi-functional three carbon synthesis. 1 with allyl, benzyl, propargyl nucleophilic center and other nucleophiles Grignard reagent addition products in the acid-catalyzed aromatization reaction is one of the important applications in the synthesis. In order to study the influence of structural differences of acetal groups on the reaction performance, we discussed the synthesis of α-oxo ketene ring dithioacetal 2 and its application in synthesis. In this paper, we synthesized some of the title compound 2c1-c10 with the new acetal group as the seven-membered ring, and chose the compound 2c1 with allyl, 2-methyl ene