Studies in Polyphenol Chemistry and Bioactivity. 2.<sup>1</sup> Establishment of Interflavan Linkage Regio- and Stereochemistry by Oxidative Degradation of an <i>O</i>-Alkylated Derivative of Procyanidin B<sub>2</sub> to (<i>R</i>)-(−)-2,4-Diphenylbutyric Acid
作者:Alan P. Kozikowski、Werner Tückmantel、Clifford George
DOI:10.1021/jo000485+
日期:2000.8.1
The assignment of interflavanbondregio- and stereochemistry in oligomeric proanthocyanidins has in the past relied on empirical spectroscopic techniques which are influenced by the conformation of the C rings. Only recently was the 4,8-regiochemistry of procyanidin B2 (3b) firmly established by 2-dimensional NMR methods. We describe herein the proof of 4beta-stereochemistry in 3b by oxidative degradation