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3- 2-Hydroxy-2- quinoxalinone

Other synthetic routes to pyrazinones and quinoxalinones are from the halo compounds, by dealkylation of ethers (8lJCS(Pl)3111> or by diazotization of the corresponding amines, but since the halo derivatives are normally derived from the hydroxy compounds, and the amines from the halo derivatives, direct synthesis seems to represent the most practical approach. [Pg.173]

Cyclohexanedione (322) and 2-amino-A -hydroxyacetamide (323) gave 1-hydroxy-5,6,7,8-tetrahydro-2(17/)-quinoxalinone (324) (Et0H-H20, minimal... [Pg.44]

The A-oxide tautomer, l-hydroxy-5,6,7,8-tetrahydro-2(l//)-quinoxalinone (284) gave l-benzyloxy-5,6,7,8-tetrahydro-2(l//)-quinoxalinone (285) (PhCH2Cl,... [Pg.237]

Amino-5-hydroxy-2(l//)-quinoxalinone 3-Amino-l-hydroxy-2(l//)-quinoxalinone... [Pg.366]

Ethoxy- l-hydroxy-2( lH)-quinoxalinone 6-Ethoxy-2-isopropyl-3-methylquinoxaline... [Pg.403]

Dichloro-l,2-benzenediamine (277, R = Cl) and ethyl 2-chloro-2-(hydroxy-imino)acetate (282) gave an apparently inseparable mixture of 6,8-dichloro-(283) and 5,7-dichloro-3-hydroxyamino-2(l//)-quinoxalinone (284) (NaHC03, EtOH-H2Q, 20°C, 24 h 81% of the mixture).562... [Pg.39]

Benzenediamine (352) and 4-/ -chlorobenzyl-3-hydroxy-5-/ -tolyl-2,5-dihy-dro-2-furanone (353) gave 3-(p-chlorophenethyl)-2( 1 //)-quinoxalinone (354) with loss of p-methylbenzaldehyde (isolated as its phenylhydrazone) (EtOH, trace AcOH, 98°C, 4 h 65%) 89 analogs likewise.89 211 565 830 834... [Pg.48]

At least two derivatives of pyran have been used for the primary synthesis of quinoxalines. Thus o-phenylenediamine (390) and 6-(p-methoxyphenyl)-6-methyl-5,6-dihydro-2//-pyran-2,5-dione (391) in methylene chloride at 20°C open to the air for 48 h gave 3-[2-hydroxy-2-(p-methoxyphenyl)propionyl]methyl-3,4-dihydro-2(1 //)-quinoxalinone (392) (as a mixture of two stereoisomers) in 92% yield 488 the 3,4,4a,5,6,7,8,8a-octahydro analog was made similarly from 1,2-diaminocyclohex-ane (91% of two separable stereoisomers).488... [Pg.53]

In a less straightforward way, D-glucose (393) underwent a Maillard-type reaction with an excess of glycine (394) under microwave irradiation to afford 5-hydroxy-l,3-dimethyl-2(lZ/)-quinoxalinone (395) as a major product,926 Repetition with labeled reactants suggested that the product contained six carbon atoms from the sugar and four from the amino acid on this evidence, a detailed mechanism has been postulated.926... [Pg.53]


See other pages where 3- 2-Hydroxy-2- quinoxalinone is mentioned: [Pg.139]    [Pg.190]    [Pg.194]    [Pg.197]    [Pg.213]    [Pg.213]    [Pg.216]    [Pg.237]    [Pg.361]    [Pg.366]    [Pg.374]    [Pg.389]    [Pg.390]    [Pg.406]    [Pg.410]    [Pg.410]    [Pg.410]    [Pg.410]    [Pg.411]    [Pg.411]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.412]    [Pg.139]   
See also in sourсe #XX -- [ Pg.53 ]

See also in sourсe #XX -- [ Pg.53 ]




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