Heterocycles. XVII. Sodium borohydride reduction of flavanonols and hydrolysis of (.+-.)-fistacacidin acetates.
作者:HIROSHI TAKAHASHI、YUMIKO KUBOTA、MIEKO IGUCHI、MASAYUKI ONDA
DOI:10.1248/cpb.33.3134
日期:——
The effects of 5-substituents on sodium borohydride reduction of flavanonols have been examined. The bulk of substituents governs the stereochemistry of reduction, and particularly, the acetoxy group gives an interesting result accompanied by over-reduction. In addition, the 5-acetoxy group plays an improtant role in the stereochemistry of the newly introduced 4-oxygen functions in hydrolysis of (±)-fistacacidin acetates.
given of the preparation and properties of the compounds involved in the nuclear magnetic resonance work previously described.1 The application of the oxime-amine method3 to the production of flavan-3,4-diols with an axial 4-OH group is described.