Helvetica Chimica Acta

The structure of covalent hydrates of alloxazines. A reinvestigation

J Koziol, B Tyrakowska, F Müller

Index: Koziol, Jacek; Tyrakowska, Bozena; Mueller, Franz Helvetica Chimica Acta, 1981 , vol. 64, # 6 p. 1812 - 1817

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Citation Number: 11

Abstract

Abstract It is shown by 13 C-NMR. and synthesis of 6, 7-dimethyl-3-ethoxycarbonylamino- quinoxaline-2-carboxamide (5) and methyl 6, 7-dimethyl-3-(N′-methylureido)-quinoxaline- 2-carboxylate (6) that hydrolysis of lumichrome (1, R= H) must yield 6, 7-dimethyl-3- ureidoquinoxaline-2-carboxylic acid (2, R= H) and not 6, 7-dimethyl-2-oxo-1, 2, 9, 9a- tetrahydrooxazolo [4, 5-b] quinoxaline-9a-carboxamide (2a, R= H), as previously ...