title: Pyridinylquinoxalines and pyridinylpyridopyrazines as lead compounds for novel p38 alpha mitogen-activated protein kinase inhibitors.
abstract: Various substituted 2(3)-(4-fluorophenyl)-3(2)-(pyridin-4-yl)quinoxalines and 2(3)-(4-fluorophenyl)-3(2)-(pyridin-4-yl)pyridopyrazines were synthesized as novel p38 alpha MAP kinase inhibitors via different short synthetic strategies with high variation possibilities. The formation of the quinoxaline/pyridopyrazine core was achieved from alpha-diketones and o-phenylenediamines/alpha-diaminopyridines under microwave irradiation. Introduction of an amino moiety at the pyridine C2 position of the 2(3)-(4-fluorophenyl)-3(2)-(pyridin-4-yl)quinoxalines led to compounds showing potent enzyme inhibition down to the double-digit nanomolar range (6f; IC(50) = 81 nM). Replacement of the quinoxaline core with pyrido[2,3-b]pyrazine gave compound 9e with superior p38 alpha MAP kinase inhibition (IC(50) = 38 nM).
authors.affiliation: Department of Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy, Eberhard-Karls-University of Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany.
authors.forename: Pierre
authors.initials: P
authors.lastname: Koch
authors.forename: Hartmut
authors.initials: H
authors.lastname: Jahns
authors.forename: Verena
authors.initials: V
authors.lastname: Schattel
authors.forename: Marcia
authors.initials: M
authors.lastname: Goettert
authors.forename: Stefan
authors.initials: S
authors.lastname: Laufer
mesh_terms: D006801:Humans; D008956:Models, Chemical; D015394:Molecular Structure; D047428:Protein Kinase Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D011719:Pyrazines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D011810:Quinoxalines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D048051:p38 Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D047428:Protein Kinase Inhibitors; D011719:Pyrazines; D011725:Pyridines; D011810:Quinoxalines; D048051:p38 Mitogen-Activated Protein Kinases