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.
Mannich Type Reactions of Acylhydrazones with Silyl Enolates for the Synthesis of b-Amino Ester, b-Amino Ketone, b-Lactam, Pyrazolidinone, and Pyrazolone Derivatives