A Novel Method for the Preparation of Acid-Sensitive Epoxides from Olefins with the Combined Use of Molecular Oxygen and Aldoacetal Catalyzed by a Cobalt(II) Complex
作者:Kiyotaka Yorozu、Toshihiro Takai、Tohru Yamada、Teruaki Mukaiyama
DOI:10.1246/bcsj.67.2195
日期:1994.8
An efficient synthesis of acid-sensitive epoxides, such as chromene oxide or epoxide of γ,δ-unsaturated alcohol, was successfully achieved by the oxygenation of corresponding olefins with the combined use of an atmospheric pressure of molecular oxygen and aldoacetal catalyzed by a cobalt(II) complex coordinated with the 1,3-diketone ligand. The reactions proceeded under mild and neutral conditions
通过在常压下分子氧和醛缩醛的协同作用,将相应的烯烃氧化,并在钴催化下,成功地合成了酸敏感环氧化物,如色烯氧化物或γ,δ-不饱和醇的环氧化物( II) 与 1,3-二酮配体配位的复合物。反应在温和且中性的条件下进行,并以良好的收率获得所需的环氧化物。在本反应条件下,既没有观察到过氧化也没有观察到形成的环氧化物分解。此外,各种甲硅烷基烯醇醚和甲硅烷基烯酮缩醛,酸敏感化合物,也分别顺利地单氧化成相应的 α-羟基酮和 α-羟基羧酸酯。