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.
我们研究了 5 个取代基对硼氢化钠还原黄烷醇的影响。大部分取代基都会影响还原的立体化学性质,尤其是乙酰氧基会产生有趣的结果,并伴随着过度还原。此外,在 (±)- 刺桐素乙酸酯的水解过程中,5-乙酰氧基对新引入的 4-氧功能的立体化学起着重要作用。