Abstract
The mode of formation of the quinoxaline versus 2[1 H]-quinoxalinone rings by the reaction of o-diamines with dehydro-d-erythorbic acid has been investigated. The study was carried out by using one and two molar equivalents of 1,2-diamino-4,5-dimethylbenzene (3b) to give 6,7-dimethyl-3-(1-oxo-d-erythro-2,3,4-trihydroxybutyl)-2[1 H]-quinoxalinone (4b) and 2-(2-amino-4,5-dimethylphenylcarbamoyl)-3-(d-erythro-glycerol-1-yl)-6,7-dimethylquinoxaline (6), respectively. The former product exists predominantly as the two furanosyl anomers. Sequential reaction of 4a with 3b has been studied, and the location of each diamine in the product was deduced by using 1H-n.m.r. spectroscopy. A mechanism for the reaction is proposed. Acetate and acetal derivatives of the compound are prepared.
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