2- Methyl-3-phenyl-3,4-dihydroquinoxaline

Methylquinoxaline with phenyUithium gave a separable mixture of 2-methyl-3-phenylquinoxaline (45), 2-methyl-3-phenyl-3,4-dihydroquinoxaline (46), and 2-methyl-2,3-diphenyl-1,2,3,4-tetrahydroquinoxaline (47) [PhLi (made in situ), Et20, <20°C, 90 min 20%, 45%, and 35%, respectively). [Pg.102]

A mixture of 2-methyl-3-methylene-7-nitro-4-phenyl-3,4-dihydroquinoxaline (97) and its quaternary perchlorate, 2,3-dimethyl-6-nitro-l-phenylquinoxali-nium perchlorate (98), underwent oxidative coupling to give l,2-bis(3-methyl-6-nitro-1 -phenyl-1,2-dihydroquinoxalin-2-ylidene)ethane (99) [Cu-(OAc)2, AcOH-MeCN, 95°C, 20 min 60%] many such condensations... [Pg.111]

Dimethyl-6-nitro-l-phenylquinoxalinium perchlorate (103) gave 2-methyl-3-methylene-7-nitro-l-phenyl-3,4-dihydroquinoxaline (104) (EtsN, AcMe,... [Pg.112]

Bromo-3-methyl-2-methylene-1 -phenyl-1,2-dihydroquinoxaline 2-Bromomethyl-6-methyl-3-... [Pg.375]

Methyl 6-methyl-2,3-dioxo-1,2,3,4-tetrahydro-5-quinoxalinecarboxylate 2-Methyl-3-methylene-7-methylsulfonyl-4-phenyl-3,4-dihydroquinoxaline 2-Methyl-3-methylene-7-nitro-4-phenyl-3,4-dihydroquinoxaline... [Pg.420]

Catalytic reduction of 2-acetyl-3-methyl(or 3-phenyl)quinoxaline with 5% palladium on activated charcoal in ethanol gives 2-acetyl-3-methyl(or 3-phenyl)-l,4-dihydroquinoxaline. °... [Pg.250]

Scheme 6.50 The synthesis and rearrangement of 2-methyl-l-[(3-oxo-3,4-dihydroquinoxalin-2-yI)(phenyl)methyl]p5oidinium chloride 133...

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