Microbial oxidation of (+)-epimagnolin a by Aspergillus niger
摘要:
Microbial transformation of (+)-epimagnolin A has been investigated using Aspergillus niger. (+)-Epimagnolin A was regioselectively oxidized at the para-methoxyl group of its veratryl group and converted to (+)-de-O-methylepimagnolin A. This metabolic product was then further oxidized at the para-position of its 3,4,5-trimethoxyphenyl group and (+)-de-4',4''-O-dimethylepimagnolin A was yielded. The structures of the metabolic products were determined by spectroscopic methods, as well as by comparison of spectral data with those of known related compounds.
Abstract Two new lignans, (−)-magnofargesin and (+)-magnoliadiol, were isolated from the flower buds of Magnoliafargesii . The absolute configuration assignment of (−)-magnofargesin was achieved by its isomerization to (+)-magnolin.
作者:Richard C.D Brown、Carole J.R Bataille、Jeremy D Hinks
DOI:10.1016/s0040-4039(00)01958-4
日期:2001.1
The first total synthesis of (+/-)-epimagnolin A was achieved employing a C-H insertion reaction to generate selectively the bicyclic framework with the exo,endo-stereochemistry. (C) 2001 Elsevier Science Ltd. All rights reserved.