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3,4-Dihydro-4-methyl-lH-[3,1]oxazinoacridine was prepared in four steps from 3-aminoacridine. DDQ induced opening of the dihydrooxazine ring yielded the 3-methylamino-4-formyl derivative. The same strategy was applied to 11-aminobenzo-[b][1,7]phenanthroline.
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