A convenient one-flask preparation of a series of symmetrical 1,2diketones from esters is reported using sodium metal induced acyloin condensation followed by reaction with thionyl chloride. Symmetrical monoketones were obtained when after initial acyloin condensation, the reaction mixture is oxidized with aqueous sodium bromate and then reacted with thionyl chloride. Preparative aspects, the scope of the reaction, and the suggested mechanism are discussed.
据报道,利用
钠金属诱导的酰化醇缩合反应,随后与亚
硫酰氯反应,可以方便地在一瓶中制备一系列对称型1,2-二酮。当初步的酰化醇缩合反应完成后,通过与
水合
次溴酸钠氧化,再与亚
硫酰氯反应,可以获得对称的一元酮。本文讨论了制备方面的细节、反应的应用范围以及提出的反应机制。