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5.6- Diphenyl-2 -pyrazinone

Greater para than ortho deactivation is seen in the hydrolysis (HCl in AcOH, 100°, 1 hr) of the nitro group in 5,6-diphenyl-2-nitro-3-pyrazinone (218) but not in 6-phenyl- or 3,6-diphenyl-2-nitro-5-pyrazinone (219). Similarly, acid hydrolysis of a 2-bfomo substituent in 3-pyrazinone, but not in 5-pyrazinone, is readily accomplished. All flve of these pyrazinones are stable in strong alkali or alkoxide as a result of complete anionization. Decreased reactivity of... [Pg.249]

Amino-2-phenylacetamide (192) and ethyl benzoylformate (193) gave 5-hy-droxy-3,6-diphenyl-2(l //)-pyrazinone (194) (EtONa, EtOH, reflux, 5 h 19%).1386 ... [Pg.28]

Hydrolysis. 2-Methoxy-3-methyl-5-phenylpyrazine (16) gave 3-methyl-5-phenyl-2(l//)-pyrazinone (17) (6 M HC1, reflux, 3 h 97%) 1307 other products like 3,6-diisopropyl-2( I //(-pyrazinonc (18, R = Pr ) (97%)1311 and 3,6-diphenyl-2(l/7)-pyrazinone (18, R = Ph) (84%)82 were made similarly. Hydriodic acid may also be used.1307... [Pg.193]

Reductive debenzylation. 2-Benzyloxy-3,6-diisobutyl-5-methoxypyrazine 4-oxide (21) gave 3,6-diisobutyl-5-methoxy-2(l//)-pyrazinone 4-oxide (22) (H2, Pd/C, EtOH, h 90% structure confirmed by X-ray analysis) 310 2,5-dibenzy-loxy-3,6-diphenylpyrazine likewise gave 5-hydroxy-3,6-diphenyl-2(l//)-pyrazinone (23) (43%).82... [Pg.193]

Irradiation of the light-sensitive crystal form of 1-methyl-5,6-diphenyl-2(l//)-pyrazinone (202) in the solid state gave the, sv -f ram-cyclodimer (203) (20°C, <4 h >86%) 1417 The anti-trans structure first proposed1417 was revised575 in light of an X-ray analysis.60 Also other examples.1327... [Pg.223]

I -Methyl-5,6-diphenyl-2( l//)-pyrazinone (204) gave 5-methyl-4,8-diphenyl-2,3-dioxa-5,7-diazabicyclo[2.2.2]oct-7-en-6-one (205) (hv, 02, Rose Bengal, CH2C12, 50°C 52%), and thence the MeOH adduct, 8-methoxy-5-methyl-... [Pg.224]

Amino-3,6-dimethyl-2(177)-pyrazinone 3-Amino-5,6-diphenyl-2-pyrazinecarbaldehyde 3-Amino-5,6-diphenyl-2-pyrazinecarbohydrazide 3-Amino-5,6-diphenyl-2-pyrazinecarbonitrile... [Pg.361]

Benzyloxy-5,6-diphenyl-2(l//)-pyrazinone 5- Benzyloxy-1 -hydroxy 3,6-dimethyl-... [Pg.373]

Bromo-5,6-dimethyl-2(177)-pyrazinone 5-Bromo-3,6-dimethyl-2(l 77)-pyrazinone 5-Bromo-2-dimethylsulfimidopyrazine 2-Bromo-5,6-diphenyl-3-propylpyrazine 2-Bromo-3,5-diphenylpyrazine... [Pg.377]

Bromo-3-methylaminopyrazine 4-oxide 6-Bromomethyl-5-chloro-l,3-diphenyl-2(lH)-pyrazinone... [Pg.378]

Chloro-3-methoxy-6-methoxymethyl-1 -phenyl-2n //)-pyrazinone 5-Chloro-6-methoxy methyl-1,3-diphenyl-20 //)-pyrazinone 2-Chloro-6-methoxy-3-methyl-5-phenylpyrazine 2-Chloro-6-methoxy-5-methyl-3-phenylpyrazine 5-Chloro-3-methoxy-6-methyl-l-phenyl-2( 1 //t-pvTa/ini iie... [Pg.391]

Dimethyl-3,6-diphenylpyrazine 1-oxide 1,3-Dimethyl-5,6-diphenyl-2(177)-pyrazinone... [Pg.411]

Ethyl-5,6-diphenyl-2(177)-pyrazinone 6-Ethyl-3,5-diphenyl-2(177)-pyrazinone Ethyl 6-ethoxy-2-pyrazinecarboximidate Ethyl 6-ethoxy-2-pyrazinecarboxylate TV-Ethyl-3-ethylamino-5-methylamino-... [Pg.421]

See other pages where 5.6- Diphenyl-2 -pyrazinone is mentioned: [Pg.193]    [Pg.248]    [Pg.136]    [Pg.252]    [Pg.253]    [Pg.50]    [Pg.199]    [Pg.207]    [Pg.223]    [Pg.361]    [Pg.371]    [Pg.378]    [Pg.387]    [Pg.387]    [Pg.387]    [Pg.391]    [Pg.391]    [Pg.402]    [Pg.405]    [Pg.409]    [Pg.416]    [Pg.417]    [Pg.417]    [Pg.417]    [Pg.417]    [Pg.417]    [Pg.421]    [Pg.421]    [Pg.427]    [Pg.427]    [Pg.427]    [Pg.428]    [Pg.430]    [Pg.431]    [Pg.432]   
See also in sourсe #XX -- [ Pg.5 ]

See also in sourсe #XX -- [ Pg.5 ]



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5-Hydroxy-3.6-diphenyl-2 pyrazinone

Pyrazinone

Pyrazinones

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