title: Substituted N-phenylpyrazine-2-carboxamides, their synthesis and evaluation as herbicides and abiotic elicitors.
abstract: The condensation of substituted pyrazine-2-carboxylic acid chlorides with ring-substituted anilines yielded five substituted pyrazine-2-carboxylic acid amides. Thesynthesis, and analytical, lipophilicity and biological data of the newly synthesizedcompounds are presented in this paper. The photosynthesis inhibition, antialgal activityand the effect of a series of pyrazine derivatives as abiotic elicitors on the accumulation offlavonoids in a callus culture of Ononis arvensis (L.) were investigated. The most activeinhibitor of the oxygen evolution rate in spinach chloroplasts was 6-chloro-pyrazine-2-carboxylic acid (3-iodo-4-methylphenyl)-amide (2, IC(50) = 51.0 micromol.L(-1)). The highestreduction of chlorophyll content in Chlorella vulgaris was found for 5-tert-butyl-N-(4-chloro-3-methylphenyl)-pyrazine-2-carboxamide (3, IC(50) = 44.0 micromol.L(-1)). The maximalflavonoid production (about 900%) was reached after a twelve-hour elicitation processwith 6-chloropyrazine-2-carboxylic acid (3-iodo-4-methylphenyl)-amide (2).
authors.affiliation: Department of Pharmaceutical Chemistry and Drug Control, Faculty of Pharmacy in Hradec Králové, Charles University in Prague, Heyrovského 1203, Hradec Králové, 500 05, Czech Republic. martin.dolezal@faf.cuni.cz
authors.forename: Martin
authors.initials: M
authors.lastname: Dolezal
authors.forename: Lenka
authors.initials: L
authors.lastname: Tůmová
authors.forename: Diana
authors.initials: D
authors.lastname: Kesetovicová
authors.forename: Jirí
authors.initials: J
authors.lastname: Tůma
authors.forename: Katarína
authors.initials: K
authors.lastname: Králová
mesh_terms: D000081:Acetamides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D048408:Chlorella vulgaris / Q000187:drug effects; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000187:drug effects; D005419:Flavonoids / Q000378:metabolism; D006540:Herbicides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D010100:Oxygen
chemical_list: D000081:Acetamides; D005419:Flavonoids; D006540:Herbicides; D002734:Chlorophyll; C030686:acetamide; D010100:Oxygen