Mechanistic rationale for the NaBH4 reduction of α-keto esters
摘要:
An intramolecular hydride delivery process largely contributes during the double reduction of alpha-keto esters into diols by NaBH4. In the cast of enolic alpha-keto esters, me first step of the process, the reduction of the keto group, occurred exclusively through an 1,2-hydride addition despite the predominance of me tautomeric enolic form The clear-cut difference of reaction rate between coolie and non enolic substrate 4 for reaction carried out in methanol is interpreted in terms of competitive hydride consumption due to the extremely favorable reaction between this solvent and NaBH4. (C) 1999 Elsevier Science Ltd. All rights reserved.
Photosensitized oxygenation of phenylpyruvic acid derivatives as a model for p-hydroxyphenylpyruvate dioxygenase
作者:Hiyoshizo Kotsuki、Isao Saito、Teruo Matsuura
DOI:10.1016/0040-4039(81)80128-1
日期:1981.1
Dye-sensitized photooxygenation of enol ethers of methyl phenylpyruvates () produced diendoperoxides in aprotic solvents, whereas in methanol hydroxylated product was obtained. The reaction scheme is discussed in comparison uith that for the enzymic transformation.