title: Glucosides from MBOA and BOA detoxification by Zea mays and Portulaca oleracea.
abstract: Incubation of Zea mays cv. Nicco seedlings with 6-methoxybenzoxazolin-2(3H)-one (MBOA) led to a minor detoxification product hitherto only found in Poaceae. This new compound was identified as 1-(2-hydroxy-4-methoxyphenylamino)-1-deoxy-beta-glucoside 1,2-carbamate (1) (methoxy glucoside carbamate) and represents an analogue to the previously described 1-(2-hydroxyphenylamino)-1-deoxy-beta-glucoside 1,2-carbamate (glucoside carbamate) from benzoxazolin-2(3H)-one (BOA). In Portulaca oleracea var. sativa cv. Gelber treatment with BOA resulted in further unknown detoxification products, which were not synthesized in detectable amounts after BOA absorption in all other species tested. Compound 1 easily undergoes decay into BOA-5-O-glucoside (2). Z. mays seedlings, known to produce BOA-6-O-Glc on incubation with BOA, are able to transform BOA-5-OH into BOA-5-O-glucoside (2). Besides the known compounds, maize contained a formerly unseen product that accumulated during late stages of the detoxification process. It was isolated and identified as 1-(2-hydroxyphenylamino)-6-O-malonyl-1-deoxy-beta-glucoside 1,2-carbamate (3) (malonyl glucoside carbamate).
authors.affiliation: Institut für Analytische Chemie, Universität Leipzig, Linnéstrasse 3, 04103 Leipzig, Germany.
authors.forename: Diana
authors.initials: D
authors.lastname: Hofmann
authors.forename: Mona
authors.initials: M
authors.lastname: Knop
authors.forename: Huang
authors.initials: H
authors.lastname: Hao
authors.forename: Lothar
authors.initials: L
authors.lastname: Hennig
authors.forename: Dieter
authors.initials: D
authors.lastname: Sicker
authors.forename: Margot
authors.initials: M
authors.lastname: Schulz
mesh_terms: D001583:Benzoxazoles / Q000494:pharmacology*; D001711:Biotransformation; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D031822:Portulaca / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects; D003313:Zea mays / Q000378:metabolism*
chemical_list: D001583:Benzoxazoles; D005960:Glucosides; C017057:benzoxazolone; C031896:6-methoxybenzoxazolinone