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Some procedures for a benzofuroisoquinolinone 1 were studied. Its O‐analogous benzofuroisocoumarin 2 was synthesized from methyl salicylate with diethyl α‐bromohomophthalate (9). And, the benzofuroisoquinolinone 1 was obtained by treating 2 with ammonia gas in a sealed tube.
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Yamaguchi et al. (1995) studied this question.
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