作者:Johan Coetzee、Elfranco Malan、Daneel Ferreira
DOI:10.1016/s0040-4020(99)00558-x
日期:1999.8
Treatment of 4 beta-chloroepioritin tri-O-methylether with phenylmethanethiol under neutral conditions affords both the 4 alpha- and 4 beta-substituted epioritin derivatives. The stereochemical course of the reaction is of relevance to the thiolysis of 5-oxy (A-ring) proanthocyanidins and to the conspicuous stability of the 7, 8-dihydroxy-2,3-cis-3,4-cis-flavan-3,4-diols, teracacidin and melacacidin, and of some of their all-cis (C-ring) oligomers. (C) 1999 Elsevier Science Ltd. Atl rights reserved.