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The synthesis of selected novel 7-methoxycarbonyl-10-substituted iso- alloxazines by the cyclocondensation of 2-substituted aminoanilines with alloxan monohydrate under acidic condition in 21-52 % yields, is described. The synthesis of selected novel 7-methoxycarbonyl-10-substituted isolloxa- zines (3) was achieved by acidic cyclocondensation of 2-substituted aminoanili- nes, which were obtained by the reduction of N-substituted 4-methoxycarbo- nyl-2-nitroaniline (1), with alloxan monohydrate (2) (Scheme 1) in 21-52 % yields. These compounds enrich the library of biologically active isoalloxazines. The formation of isoalloxazines 3 was confirmed by various spectroscopic data. The UV-visible absorption maxima at 438 (0.71), 334 (0.35) and 275 (2.59) nm in dimethyl sulphoxide (DMSO) of 7-methoxycarbonyl-10-propylisoalloxazine (3a) indicates the formation of the isoalloxazine nucleus. 13 The appearance of peaks at 1735, 1706 and 1660 cm -1 in the IR spectrum of isoalloxazine 3a indi-

Synthesis of selected novel 7-methoxycarbonyl-10-substituted isoalloxazines