Formation and reactivity of the addition products of alkoxides and thiolate anions to vinyl selenones
作者:Marcello Tiecco、Donatella Chianelli、Marco Tingoli、Lorenzo Testaferri、Donatella Bartoli
DOI:10.1016/s0040-4020(01)82072-x
日期:1986.1
Vinyl selenones react with sodium methanethiolate in methanol to give the product of conjugate addition and subsequent displacement of the selenonyl group. On the contrary, the same reaction carried out with alkoxide anions affords the conjugate addition products in excellent yields. These β-alkoxy alkyl phenyl selenones are stable compounds which can react in several ways with loss of the selenonyl
乙烯基硒酮与甲硫醇钠在甲醇中反应,得到共轭物加成和随后的硒烯基取代的产物。相反,用醇盐阴离子进行的相同反应以优异的产率提供了缀合物加成产物。这些β-烷氧基烷基苯基硒酮是稳定的化合物,其可以几种方式反应而失去硒烯基。在MeOH和DMF中都研究了它们与MeONa或MeSNa的反应。观察到的产物源自取代和消除过程以及逆向迈克尔反应,随后是亲核取代由此生成的乙烯基硒酮。这些结果表明,ArSeO 2是具有特殊性质的强电子吸引基团。除使酸性的α-氢原子外,它还激活了碳-碳双键,从而添加了阴离子试剂,并且在亲核取代(脂肪族和乙烯基)以及消除反应中充当了良好的离去基团。试剂溶剂和适当选择允许引向期望的产物的反应。提出了这些反应的有用的合成应用。