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A new convenient synthesis of pyrrolo[3,2,1-ij]quinolin-4-one derivatives is described. In this method, methyl-7-hydroxquinoline-2-ones are the starting materials onto which the third pyrrolo ring is condensed directly, yielding dehydrogenated methyl-9-hydroxypyrrolo[3,2,1-ij]quinolin-4-ones.
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Chilin et al. (1991) studied this question.
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