3.6- Diethyl-2 -pyrazinone

Diethyl-5-methyl-3,6-dihydro-2(l//)-pyrazinone 4-oxide (301) gave dimethyl 4,4-diethyl-3a-methyl-6-oxo-4,5,6,7-tetrahydro-3a/7-isoxazolo[2,3-a]pyrazine-2,3-dicarboxylate (302) (Me02CC CC02Me, CHC13, reflux, 3 h 64%) 544 homologues likewise.544... [Pg.238]

Bromo-5,6-dichloro-2-pyrazinamine 3-Bromo-5,6-dichloro-2(177)-pyrazinone 5-Bromo-3,6-diethyl-2(77)-pyrazinone 5-Bromo-3,6-diisobutyl-2(177)-pyrazinone 5-Bromo-3,6-diisobutyl-2(177)-pyrazinone... [Pg.377]

Cyclohexyl-3-isopropyl-5,6-dimethylpyrazine 2-Cyclohexylpyrazine 2-Cyclohexylsulfinyl-3,6-diethylpyrazine 2-Cyclohexylsulfinyl-3,6-dimethylpyrazine 2-Cyclohexylsulfinyl-3,5-diphenylpyrazine 2-Cyclohexylsulfinyl-3,6-dipropylpyrazine 2-Cyclohexylsulfinylpyrazine 2-Cyclohexylthio-3,6-diethylpyrazine 5-Cyclohexylthio-3,6-diethyl-2(17/)-pyrazinone... [Pg.396]

Di -5 ec-butyl-2(l//)-pyrazinone, an Aspergillus sp metabolite. Diethylcarbamazine, V,A-diethyl-4-melhyl-1 -piperazinecarboxamide, antiliehnintic... [Pg.241]

Ethyl 7-oxopteridine-6-carboxylate is synthesized from the diamine and diethyl mesoxalate [2299]. A substituted 2-quinoxalinone is obtained from A -methylphenylenediamine and DMAD [2678], but under slightly different conditions, two molar amounts of DMAD react with one of diamine [3252]. Stirring a diamine with the oxazolone (76.18) in acetic acid under mild conditions leads to the formation of a pyrazinone ring [3250]. [Pg.489]

Heterodienophiles have also been studied diethyl azodicarboxylate adds across the 2,6-positions of a pyridazin-3-one, and singlet oxygen across the 2,5-positions of pyrazinones. The immediate cycloadduct is isolable when acryloyl cyanide is used as the heterodiene component in reaction with a pyrimidine-2,4-dione. ... [Pg.213]

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