5- Bromo-3,4-dihydro-2 -quinoxalinone

Bromo-A -ferf-butyl-6-(2-chloroacetamido)aniline (25) gave 5-bromo-4-tert-butyl-3,4-dihydro-2(l//)-quinoxalinone (26) (EtPrjN, Nal, MeCN, reflux, 22 h 79%). ... [Pg.5]

Benzenediamine (228) and diethyl dibromomalonate (229) gave ethyl 3-oxo-3,4-dihydro-2-quinoxalinecarboxylate (230) (MeOH, 20°C, 24 h 40%)." The same substrate (228) with ethyl a-bromoisobutyrate gave 3,3-dimethyl-3,4-dihydro-2(17i)-qumoxalinone (231) (Me2NCHO, NEtPr j, 110°C, 7 h 76%) or with methyl 2-bromo-2-phenylacetate gave 3-phenyl-3,4-dihydro-2(l//)-quinoxalinone (232) (KI, K2CO2, AcMe, reflux, 12 h then oily product, MeONa, PhH, reflux, 7 h 89%). ... [Pg.33]

Bromo-7-fluoro-3,4-dihydro-2(177)-quinoxalinone (35) gave 6-bromo-7-fluoro-5-nitro-2,3(177,477)-quinoxalinedione (36) regioselectively (fuming HNO3, F3CCO2H, 20°C, 12 h 85% analogs likewise). ... [Pg.193]

Bromo-7-fluoro-3,4-dihydro-2(l//)-quinoxalinone (2) gave only 6-bromo-... [Pg.256]

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