Chemistry of alloxazines and isoalloxazines

CONTENTS
I. Introduction 291
II. Synthesis of alloxazines from o-phenylenediamines and alloxan 291
III. Synthesis of isoalloxazines from primary-secondary aromatic o-diamines and alloxan 293
IV. Synthesis of alloxazines and isoalloxazines from aromatic o-diamines and alloxantin or dialuric acid 295
V. Synthesis of alloxazines and isoalloxazines from aromatic o-quinones and diaminodihydroxypyrimidines 296
VI. Synthesis of alloxazines and isoalloxazines from aromatic o-diamines and halogenobarbituric acids 296
VII. Synthesis of alloxazines and isoalloxazines from aromatic m-diamines and violuric acid 297
VIII. Synthesis of alloxazines from aromatic o-diamines and violuric acid 297
IX. Synthesis of alloxazines and isoalloxazines from aromatic o-aminoazo-compounds and barbituric acid 298
X. Other syntheses of alloxazines and isoalloxazines 298
XI. Synthesis of analogues of alloxazines and isoalloxazines 299
XII. Properties of alloxazines and isoalloxazines 300
XIII. Naturally occurring alloxazines and isoalloxazines and compounds with antimetabolite and pharmacological properties 304