Sesquiterpenes from two subspecies of Sideritis varoi
作者:Andrés García-Granados、Antonio Molina、Antonio Sáenz de Buruaga、Juan Manuel Sáenz de Buruaga
DOI:10.1016/s0031-9422(00)80815-8
日期:1985.1
Abstract Two subspecies of Sideritisvaroi afforded, in addition to previously reported diterpenes, the following series of new eudesmane and eudesmene acetates: 1β-hydroxy-6β-acetoxy-eudesm-4(15)-ene; 1β,4β-dihydroxy-6β-acetoxy-eudesmane; 1β-hydroxy-6β-acetoxy-eudesm-3-ene; 1β-hydroxy-6β-acetoxy-eudesm-4-ene. The structures of these compounds were elucidated by chemical and spectroscopic means.
Biotransformation of 4β-hydroxyeudesmane-1,6-dione by Gliocladium roseum and Exserohilum halodes
作者:Andrés Garcı́a-Granados、Marı́a C. Gutiérrez、Francisco Rivas、José M. Arias
DOI:10.1016/s0031-9422(01)00340-5
日期:2001.11
Biotransformation of sesquiterpene 4 beta -hydroxyeudesmane-1,6-dione by the filamentous fungi Gliocladium roseum and Exserohilum halodes was achieved. With Exserohilum halodes, only one metabolite was obtained, as a result of the regio- and stereoselective reduction of the keto group at C-1, which is difficult to achieve by chemical means. Five metabolites were produced with Gliocladium roseum, three of which, the 7 alpha -hydroxylated, the 7 alpha, 11- and the 1 alpha ,8 alpha -dihydroxylated derivatives, have not previously been reported, The hydroxylation at C-1 I is the main action of this microorganism, These 11-hydroxylated compounds can be chemically transformed into 6 beta ,12-eudesmanolides. (C) 2001 Published by Elsevier Science Ltd.