5.7- Dimethoxy-3-phenyl-2 -quinoxalinone

Dimethoxy-3-phenyl-2(l/7)-quinoxalinone gave 2-chloro-5,7-dimethoxy-3-phenylquinoxaline (4) (POCI3, reflux, 30 min 94%) " 6,7-dimethoxy-2,3(1//,4//)-quinoxalinedione gave 2,3-dichloro-6,7-dimethoxyquinoxaline (5) (POCI3, 100°C, 4h 83%)J ... [Pg.134]

Dunethoxy-3-phenyl-2(l/7)-quinoxalinone gave 2-bromo-5,7-dimethoxy-3-phenylquinoxaline (19) (PBr3, 135°C, 75 min 50%)." ... [Pg.137]

The kinetics for alkaline hydrolysis of 2-(o-, m-, or -nitrophenoxy)quinoxaline to 2(171)-quinoxalinone have been measured in some detail. 6,7-Dimethoxy-2-phenylquinoxaline (17) gave 2-phenyl-6,7(l//,4//)-quinoxaline-dione (18) (48% HBr, reflux, 23 h 53% as hydrobromide). [Pg.191]

Amino-5,7-dimethoxy-3-phenyl-2(17/)-quinoxalinone (127) gave 6-methoxy-3-oxo-2-phenyl-3,4-dihydro-5,8-quinoxalinequinone (128) (NaI04, H2SO4, MeOH, H2O, 20°C, 3 min 87%). ... [Pg.208]

Dimethoxy-8-nitro-3-phenyl-2( 1 //)-quinoxalinone (43, R = N02) gave 8-amino-5,7-dimethoxy-3-phenyl-2(l//)-quinoxalinone (43, R = NH2) (Na2S204, NaHC03, MeOH, H20, reflux, 30 min 64%).486... [Pg.265]

DMQPH = 6,7-dimethoxy-l-methyl-2(177j-quinoxalinone-3-proprionylcarboxylic acid hydrazide, HCPI = 2-(4-hydrazinocarbonylphenyl)-4,5-diphenyli-midazole, DBPM = 7V-[4 (6 dimethylamino-2-benzofuranyl)phenyl]maleimide, DNS-H = dansyl hydrazine, DBD H = 4 (AA -dimethylaminosulphonyl) 7-hydrazino-2,l,3-benzoxadiazole, DETBA = l,3-diethyl-2-thiobarbituric acid, DCIA = 7-dimethylamino-3- 4-[(iodoacetyl)amino]phenyl -4-methylcou marin, m-CED = 1, 2-bjs(3-chlorophenyl)ethylenediamine. [Pg.413]

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