Palladium-Catalyzed Intramolecular Metallo-Ene Reactions Using Allylic Sulfones as Enophiles.
作者:Kunio HIROI、Kazushige HIRASAWA
DOI:10.1248/cpb.42.786
日期:——
Palladium-catalyzed intramolecular metallo-ene reactions were studied using allylic sulfones as enophiles. Palladium-catalyzed reactions of allylic acetates and methyl carbonates bearing allylic sulfones at appropriate sites were carried out in acetic acid at 80°C to give cyclized products, cyclohexane derivatives, with extremely high diastereoselectivity. The stereochemistry of these reactions was examined under various reaction conditions using several model compounds.
研究了使用烯丙基砜作为亲电试剂的钯催化的分子内金属烯反应。在80°C的乙酸中,进行了在适当位置带有烯丙基砜的烯丙基乙酸酯和甲基碳酸酯的钯催化反应,得到了具有极高非对映选择性的环化产物,即环己烷衍生物。通过使用几种模型化合物在不同反应条件下考察了这些反应的立体化学特性。