O-Phenylenediamine → methyl 2-(3-oxo-4H-quinoxalin-2-yl)acetate

Participants

Reaction Steps

Dimethyl acetylenedicarboxylate (31.2 g., 0.22 mol.) was added slowly to a solution of o-phenylenediamine (21.6 g., 0.2 mol.) in methanol (400 ml.). The reaction mixture was stirred at room temperature for three hours and then cooled in an ice bath. The yellow solid was collected and washed with cold methanol. The solid was recrystallized from tetrahydrofuran (27.7 g., m.p. 230-232° dec.).

Provenance & Evidence