| Literature DB >> 20685216 |
M Iqbal Choudhary1, S Adnan Ali Shah, Shamsun-Nahar Khan, Mahmud Tareq Hassan Khan.
Abstract
Sixteen new and one known metabolites 4-20 were obtained by incubation of tibolone (1) and hydroxytibolones (2 and 3) with various fungi. Their structures were elucidated by means of a homo and heteronuclear 2D NMR and by HREI-MS techniques. The relative stereochemistry was deduced by 2D NOESY experiment. Metabolites of tibolone (1) exhibited significant inhibitory activities against alpha-glucosidase and tyrosinase enzymes. Hydroxylations at C-6, C-10, C-11, C-15 positions and alpha,beta-unsaturation at C-1/C-2, C-4/C-5 showed potent inhibitory activities against these enzymes. Copyright 2010 Elsevier Inc. All rights reserved.Entities:
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Year: 2010 PMID: 20685216 DOI: 10.1016/j.steroids.2010.05.017
Source DB: PubMed Journal: Steroids ISSN: 0039-128X Impact factor: 2.668