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3.6- Dihydro-2,5 -pyrazinedione

Ethyl yV-[2-(tert-butoxycarbonylamino)propionyl]glycinate (39) gave 3-methyl-3,6-dihydro-2,5(l//,4//)-pyrazinedione (40) (200°C, A, 30... [Pg.8]

Sodium a-butoxycarbonyl-a-nitromethanesulfonate (257) gave 3,6-dihydro-2,5(1//, 4//)-pyrazinedione (260) [Pd/C, EtOH—H20, H2, 20°C, 24 h 60% the mechanism involved disproportionation of the initial amino intermediate (258) into disodium a-amino-a-butoxycarbonylmethanedisulfonate (259) (isolated in 72% yield) and butyl glycinate, which self-condensed spontaneously to give the product (260)].1111... [Pg.35]

Amino-4,5-dihydro-3 (2//)-isoxazolone (57) gave 3,6-bis(aminooxymethyl)-3,6-dihydro-2,5 (1H, All )-pyrazinedione (58) (AcOH—EtOH, reflux, 45 min ... [Pg.55]

Again, only one example of this synthesis has been reported. Like the analogous substrate (140), isobutyl 1,1 -dimethyl-5,8-dioxo-1,5,6,7,8,8a-hexahydro-3//-thia-/oIo13,4-a pyrazine-3-carboxyIic acid (142) underwent hssion and desulfurization (on stirring with ethanolic Raney nickel at 20°C for 12 h) to afford an hydropy-razine, this time l-isobutoxycarbonylmethyl-6-isopropyl-3,6-dihydro-2,5(l//, 4H)-pyrazinedione (143) in 89% yield.1255... [Pg.69]

Benzylidene-4,7-dimethyl-2-phenyl-l-oxa-4,7-diazaspiro[2.5]octane-5,8-dione (151) gave 3-bcnzoyl-6-bcnzylidcne-l,4-dime(hyl-3,6-dihydro-2,5(177, 477)-pyrazinedione (152) (TsOH, PhMe, reflux, water removal ( ), 18 h 73%).1030... [Pg.70]

Dibenzylidene-l,4-dimethyl-3,6-dihydro-2,5(1//,4//)-pyrazinedione (285) gave 3-benzylidene-6-(a-bromobenzyl)-6-hydroxy-l,4-dimethyl-l,4-dimethyl-3,6-di-hydro-2,5(l//, 4//)-pyrazinedionc (286) [NBS/H20—dioxane (— HOBr), 20°C, 12 h erythro and threo isomer, 50 and 33%, respectively, after separation],1030 also analogous reactions.1036... [Pg.122]

In a similar manner, 3-isobutyl-6-methyl-3,6-dihydro-2,5(l//,4//)-pyrazinedione (9, R = Me) gave 2-chloro-3-isobutyl-6-methylpyrazine (10, R = Me), 2-chloro-6-isobutyl-3-methylpyrazine (11, R = Me), and 2,5-dichloro-3-isobutyl-6-methylpyrazine (12, R = Me) (27, 21, and 4%, respectively).295... [Pg.139]

Picroroccellin, 3, 6-dibenzyl-3-hydroxy-6-methoxy-l(or4)-methyl-3, 6-dihydro-2, 5(1/7, 4//)-pyrazinedione (revised structure), a Roccella sp lichen metabolite [87291-18-7].1036,1702... [Pg.243]

Bis(3,6-dioxopiperazin-2-ylmethyl) disulfide (10) gave 3-mercaptomethyl-3,6-dihydro-2,5(177,47/)-pyrazinedione (11) (HSCH2CH2OH, no details).1440... [Pg.246]

See other pages where 3.6- Dihydro-2,5 -pyrazinedione is mentioned: [Pg.1043]    [Pg.1043]    [Pg.7]    [Pg.8]    [Pg.13]    [Pg.34]    [Pg.34]    [Pg.37]    [Pg.58]    [Pg.83]    [Pg.84]    [Pg.85]    [Pg.113]    [Pg.139]    [Pg.140]    [Pg.143]    [Pg.162]    [Pg.176]    [Pg.178]    [Pg.178]    [Pg.181]    [Pg.191]    [Pg.201]    [Pg.205]    [Pg.215]    [Pg.225]    [Pg.337]    [Pg.399]    [Pg.415]   


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1.4- Dimethyl-5,6-dihydro-2,3 pyrazinedione

3- Isobutyl-3,6-dihydro-2,5 pyrazinedione

3-Methyl-3,6-dihydro-2,5 pyrazinedione

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