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2-Phenylquinoxaline 4-oxide

Reaction of 3,4-dihydro-3-oxo-2-phenylquinoxaline 1-oxides 8 with acetic anhydride in the presence of perchloric acid at room temperature gives high yields (80-96%) of the yellow to red N-acetoxyquinoxalinium perchlorates 9. The salts (R = H or MeO R = Me) decompose rapidly at room temperature, but the remaining quinoxalinium salts are relatively stable. ... [Pg.249]

Benzenediamine (129) gave 2-phenylquinoxaline (132) [BzCH2SOMe or BzCH(SOMe)2, PhH, AcOH, reflux, 2 h 35% after separation from another product aerial or sulfoxide oxidation required with the first reagent). [Pg.22]

Benzoxadiazole 1-oxide (490) gave either 2-phenylquinoxaline 4-oxide (491) [PhCH=CHC(=0)Me, HN(CH2)4, MeCN, reflux, 24 h 35% note deacylation] or 2-acetyl-3-phenylquinoxalme 4-oxide (492) [PhCH - -... [Pg.65]

Phenyl-6-trifluoromethylquinoxaline (229) gave 2-phenyl-6-trifluoromethyl-quinoxaline 4-oxide (230) (HCO2H, 30% H2O2, 50°C, 12 h 85% homologs similarly)6-methoxy- (231, R = OMe) and 6-nitro-3-phenylquinoxaline 1-oxide (231, R = N02), as well as other analogs, were made similarly in... [Pg.226]

Methoxy-5-nitro-3-phenylquinoxaline gave only 6-methoxy-5-nitro-3-phenyl-quinoxaline 1-oxide (232) (AcOH, 30% H2O2, 80°C, 3 h 81%) 1,3-dimethyl-2(17/)-quinoxalinone 4-oxide (233) was made similarly but in only... [Pg.226]

Ethyl-3-phenylquinoxaline 1,4-dioxide 2-Ethyl-3-phenylquinoxaline 1-oxide 2-Ethyl-3-phenylquinoxaline 4-oxide 1 -Ethyl2-phenyl-2( l//)-quinoxalinone 2-Ethyl-3-propylquinoxaline... [Pg.407]

Phenylquinoxaline 3-Phenyl-2-quinoxalinecarbaldehyde 3-Phenyl-2-quinoxalinecarbaldehyde 1,4-dioxide 3-Phenyl-2-quinoxalonecarbaldehyde 1-oxide 3-Phenyl-2-quinoxalinecarbonitrile... [Pg.429]

A -Phenacy I-/V-tosy I ami no)-4-methy I-2-nitrobenzene (51) gave 6-methyl-3-phenylquinoxaline (52) (SnCl2, HCl-AcOH, 60°C, 90 min 54% aromatiza-tion by aerial oxidation during workup ).530... [Pg.9]

Phenylquinoxaline 1,4-dioxide (276) gave 2-phenacyl-3-phenylquinoxaline 4-oxide (277) (BzMe, KOH, MeOH, reflux, 5 min 45%).137... [Pg.236]

See other pages where 2-Phenylquinoxaline 4-oxide is mentioned: [Pg.429]    [Pg.43]    [Pg.44]    [Pg.44]    [Pg.350]    [Pg.410]    [Pg.222]    [Pg.235]    [Pg.8]    [Pg.231]    [Pg.361]    [Pg.362]    [Pg.364]    [Pg.364]    [Pg.364]    [Pg.370]    [Pg.377]    [Pg.385]    [Pg.385]    [Pg.385]    [Pg.409]    [Pg.409]    [Pg.413]    [Pg.416]    [Pg.416]    [Pg.417]    [Pg.423]    [Pg.423]    [Pg.423]    [Pg.423]    [Pg.423]    [Pg.426]    [Pg.427]    [Pg.427]    [Pg.430]    [Pg.8]    [Pg.231]   


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2- Phenylquinoxaline

2-Acetyl-3-phenylquinoxaline 4-oxide

2-Phenylquinoxaline 4-oxide reactions

6- Methoxy-3-phenylquinoxaline 1-oxide

6- Methoxy-5-nitro-3-phenylquinoxaline 1-oxide

6-Nitro-3-phenylquinoxaline 1-oxide

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