Microbial transformation of 3β-acetoxypregna-5,16-diene-20-one by Penicillium citrinum
摘要:
The biotransformation of 3 beta-acetoxypregna-5,16-diene-20-one (1) by using a filamentous fungus Penicillium citrinum resulted in the production of four metabolites 2-5. The structures of these compounds were elucidated by different spectroscopic analysis (1D- and 2D-NMR) and HR-ESI-MS as 3 beta,7 beta-dihydroxy-pregn-5,16(17)-dien-20-one (2), 3 beta-hydroxy-7 alpha-methoxy-pregn-5,16(17)-dien-20-one (3), 3 beta,7 beta,11 alpha-trihydroxy-pregn-5,16(17)-dien-20-one (4), and a known 3 beta,7 alpha-dihydroxy-pregn-5,16(17)-dien-20-one (5). The 7-O-methylation is a novel reaction in the field of microbial transformation of pregnane steroids. (C) 2010 Elsevier Inc. All rights reserved.