The Addition of 1-Lithio-1-(phenylthio)alkanes to 2-(N-Methylanilino)-acrylonitrile: An Easy Access to 3-(Phenylthio)ketones and 2-Enones A simple and versatile strategy for the synthesis of the title compounds is described. The key-step consists in the addition of 1-lithio-1-(phenylthio)alkanes to 2-(N-methylanilino)acrylonitrile, the nucleophilic phenylthioalkylation of an enol-cation equivalent. Alkylation of the adducts and hydrolysis give 3-(phenylthio)ketones, which can be isolated, or without further purification can be transformed into 2-enones via the wellknown oxidation-elimination procedure. These reactions are possible with allylic derivatives too, therefore the homologous vinylic compounds can be prepared by the same way. Pyrolysis of the 1-lithioaminonitriles formed within the first step gives aminonitriles of cyclopropanones via cyclization.
1-Lithio-1-(phenylthio)alkanes 与 2-(
N-甲基苯胺基)-
丙烯腈的加成: 轻松获得 3-(苯
硫基)酮和 2-烯酮 描述了合成标题化合物的简单而多用途的策略。关键步骤是将 1-
硫代-1-(苯
硫基)
烷烃加到 2-(
N-甲基苯胺基)
丙烯腈中,使烯醇阳离子等价物发生亲核的苯
硫烷基化反应。加合物的烷基化和
水解可得到 3-(苯
硫基)酮,这些酮可以分离出来,或者无需进一步纯化,通过著名的氧化-消除过程转化为 2-烯酮。烯丙基衍
生物也可以发生这些反应,因此可以用同样的方法制备同源的
乙烯基化合物。在第一步中形成的 1-亚
硫基
氨基
硝酸酯经高温分解后,通过环化反应可得到环
丙酮的
氨基
硝酸酯。