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2.2.3.3- Tetramethyl-2,3-dihydropyrazine 1,4-dioxide

Bis(hydroxyamino)-2,3-dimethylbutane (160) and glyoxal gave 2,2,3,3-tetramethyl-2,3-dihydropyrazine 1,4-dioxide (161) (H20—EtOH, reflux, 10 min 83% naturally not subject to facile oxidation).702 Also other examples.1,86 237 414,466,483 588 988 1108... [Pg.24]

Tetramethyl-2,3-dihydropyrazine 1,4-dioxide (303) gave 2,2,3,3-tetram-ethyl-l,4-piperazinediol (304) (NaBH4, H20, 20°C, 24 h 81% homologues likewise).702 Also analogous reductions.702... [Pg.239]

See also in sourсe #XX -- [ Pg.23 ]

See also in sourсe #XX -- [ Pg.23 ]

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2.2.3.3- Tetramethyl-2,3-dihydropyrazine

2.3- Dihydropyrazines

Dihydropyrazine

Dihydropyrazine 1,4-dioxides