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In vitro metabolism of chloroprene: Species differences, epoxide stereochemistry and a de-chlorination pathway

Lookup NU author(s): Emeritus Professor Bernard Golding, Dr Tony Munter, Professor William Watson

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Abstract

Chloroprene (1) was metabolized by liver microsomes from Sprague-Dawley rats, Fischer 344 rats, B6C3F1 mice, and humans to the monoepoxides, (1-chloro-ethenyl)oxirane (5a/5b), and 2-chloro-2-ethenyloxirane (4a/4b). The formation of 4a/4b was inferred from the identification of their degradation products. With male Sprague-Dawley and Fischer 344 rat liver microsomes, there was a ca. 3:2 preference for the formation of (R)-(1-chloroethenyl)oxirane (5a) compared to the (S)-enantiomer (5b). A smaller but distinct enantioselectivity in the formation of (S)-(1-chloro-ethenyl)oxirane occurred with liver microsomes from male mouse (R:S, 0.90:1) or male human (R:S, 0.86:1). 2-Chloro-2-ethenyloxirane was very unstable in the presence of the microsomal mixture and was rapidly converted to 1-hydroxybut-3-en-2-one (11) and 1-chlorobut-3-en-2-one (12). An additional rearrangement pathway of 2-chloro-2-ethenyloxirane gave rise to 2-chlorobut-3-en-1-al (14) and 2-chlorobut-2-en-1-al (15). Further reductive metabolism of these metabolites occurred to form 1-hydroxybutan-2-one (17) and 1-chlorobutan-2-one (18). In the absence of an epoxide hydrolase inhibitor, the microsomal incubations converted (1-chloroethenyl)oxirane to 3-chlorobut-3-ene-1,2-diol (21a/21b). When microsomal incubations were supplemented with glutathione, 1-hydroxybut-3-en-2-one was not detected because of its rapid conjugation with this thiol scavenger.


Publication metadata

Author(s): Cottrell L, Golding BT, Munter T, Watson WP

Publication type: Article

Publication status: Published

Journal: Chemical Research in Toxicology

Year: 2001

Volume: 14

Issue: 11

Pages: 1552-1562

ISSN (print): 0893-228X

ISSN (electronic): 1520-5010

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/tx0155404

DOI: 10.1021/tx0155404


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