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Lactones 35 [1]. Metabolism of iodolactones with cyclohexane ring in Absidia cylindrospora culture

Paper ID Volume ID Publish Year Pages File Format Full-Text
17495 42673 2011 8 PDF Available
Title
Lactones 35 [1]. Metabolism of iodolactones with cyclohexane ring in Absidia cylindrospora culture
Abstract

The metabolism of δ-iodo-γ-lactones containing cyclohexane ring with an increasing number of methyl substituents (4a–d) in Absidia cylindrospora was studied and seven metabolites were isolated as the products of biotransformations of these substrates. They were formed as the result of various dehalogenation pathways and four of them (hydroxylactones 5a–c and epoxylactone 8) turned out to be new compounds. The conversion of substrates ranged from 60% to 90% and the highest conversion was observed for the iodolactone with an unsubstituted cyclohexane ring (4a). The products were fully characterized by the spectroscopic methods and for the hydroxylactone with gem-dimethyl group at C-5 (5c) and hydroxylactone with trimethylcyclohexane system (5d) the crystal structures were obtained. The main products formed in the process of hydrolytic dehalogenation were δ-hydroxy-γ-lactones (5a–d) with the hydroxy group located cis in relation to lactone moiety. In case of lactone with 4,4,6-trimethylcyclohexane system (4d) the dehydrohalogenation followed by the epoxidation of double bond was also observed. One of the metabolites 4,5-epoxy-2,2,6-trimethyl-9-oxabicyclo[4.3.0]nonan-8-one (8) was formed in the sequence of three reactions: hydroxylation at C-5, translactonization and intramolecular nucleophilic substitution of the iodine by the hydroxy group. Some of the isolated products of transformation of the iodolactone with trimethylcyclohexane system (4d) were obtained as the single enantiomers (5d, 7, and 8). The application of fungi studied to the dehalogenation of iodolactones could be a useful method in the production of new metabolites with oxygen-containing functional groups with antifeedant activity.

Keywords
Absidia cylindrospora; Dehalogenation; Lactone; Halogenated compound; Whole-cells biotransformation
First Page Preview
Lactones 35 [1]. Metabolism of iodolactones with cyclohexane ring in Absidia cylindrospora culture
Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 48, Issues 4–5, 7 April 2011, Pages 326–333
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering