Rare Earth Triflate-Catalyzed Addition Reactions of Acylhydrazones with Silyl Enolates. A Facile Synthesis of Pyrazolone Derivatives
作者:Hidekazu Oyamada、Shu Kobayashi
DOI:10.1055/s-1998-1638
日期:1998.3
In the presence of a catalytic amount of a rare earth triflate, benzoylhydrazones reacted with silyl enolates to afford the corresponding β-N′-benzoylhydrazino esters in high yields. The hydrazino esters thus obtained were readily converted to pyrazolone derivatives by treatment with a base. A three-component reaction between an aldehyde, an acylhydrazine, and a silyl enolate was also performed successfully.
在一定量的稀土三酸盐催化下,苯甲酰肼与硅烯酸酯发生反应,生成相应的δ-N′-苯甲酰肼酯,产率很高。由此获得的肼酯经碱处理后很容易转化为吡唑酮衍生物。此外,还成功地进行了醛、酰基肼和硅烷基烯醇的三组分反应。