4- Carboxymethyl-3,4-dihydro-2 quinoxalinone

Benzenesulfonyl-l-ethoxycarbonylmethyl-3,4-dihydro-2(l//)-quinoxalinone (8) gave either l-carboxymethyl-2(l//)-quinoxalinone (9) (1.25M NaOH, reflux, 6 h 92% note additional nuclear oxidation by loss of PhS02H) or 4-benzenesulfonyl-1 -carboxymethyl-3,4-dihydro-2(lfl)-quinoxalinone (10) (H2 SO4, AcOH, H2O, 80°C, 15 min then 60°C, 5 h then 20°C, 16 h 27%). Methyl 3-methyl-2-quinoxalinecarboxylate 1,4-dioxide (11, R = Me) gave 3-methyl-2-quinoxalinecarboxyhc acid 1,4-dioxide (11, R = H) (Et3N, CaCl2,... [Pg.319]

Benzoyl-l-benzyloxycarbonylmethyl-3,4-dihydro-2(17i)-quinoxalinone (14) gave l-carboxymethyl-3,4-dihydro-2(l//)-quinoxalinone (15) (Pd/C, AcOEt, H2, 20°C, 90% note additional A-debenzoylation)." ... [Pg.320]

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