title: Benzofused tricycles based on 2-quinoxalinol.
abstract: This paper describes our recent efforts to synthesize novel compound scaffolds integrating 2-quinoxalinol with privileged structures of 1,3-dihydro-benzoimidazol-2-one, 1,3-dihydro-benzoimidazole-2-thione, 3-hydroxy-1H-quinoxalin-2-one, 2H-benzo[1,4]oxazin-3-ol, 2H-benzo[1,4]thiazin-3-ol, and 1,3,4,5-tetrahydro-benzo[1,4]diazepin-2-one, respectively. Eight novel benzofused tricycles and their substituent diversity points were developed. These include pyrazino[2,3-g]quinoxaline-2,8-diol (I), 3-hydroxy-6,8,9,10-tetrahydro-1,4,6,10-tetraaza-cyclohepta[b]naphthalen-7-one (II), 6-hydroxy-4H-1-oxa-4,5,8-triaza-anthracen-3-one (III), 6-hydroxy-4H-1-thia-4,5,8-triaza-anthracen-3-one (IV), 6-hydroxy-1,1-dioxo-1,4-dihydro-2H-1lambda(6)-thia-4,5,8-triaza-anthracen-3-one (V), 6-hydroxy-1,3-dihydro-imidazo[4,5-g]quinoxalin-2-one (VI), 6-hydroxy-1,3-dihydro-imidazo[4,5-g]quinoxaline-2-thione (VII), and 7-hydroxy-1,4-dihydro-pyrazino[2,3-g]quinoxaline-2,3-dione (VIII). This strategy of integrating two benzofused privileged structures into one molecule may provide a greater chance for the discovery of novel lead compounds.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Xian Nong Tan Street, Beijing 100050, P. R. China. gangliu27@yahoo.com
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Binbin
authors.initials: B
authors.lastname: Kou
authors.forename: Suode
authors.initials: S
authors.lastname: Zhang
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Yuan
authors.forename: Tao
authors.initials: T
authors.lastname: Ma
authors.forename: Yan
authors.initials: Y
authors.lastname: Shang
authors.forename: Yuancheng
authors.initials: Y
authors.lastname: Li
mesh_terms: D000873:Anthracenes / Q000138:chemical synthesis / Q000737:chemistry; D001562:Benzimidazoles / Q000138:chemical synthesis* / Q000737:chemistry; D020650:Combinatorial Chemistry Techniques / Q000379:methods; D004139:Dinitrofluorobenzene / Q000031:analogs & derivatives / Q000737:chemistry; D007093:Imidazoles / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D009281:Naphthalenes / Q000138:chemical synthesis / Q000737:chemistry; D011810:Quinoxalines / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000873:Anthracenes; D001562:Benzimidazoles; D007093:Imidazoles; D009281:Naphthalenes; D011810:Quinoxalines; D004139:Dinitrofluorobenzene; C002041:1,5-difluoro-2,4-dinitrobenzene