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Azide-methylenecyclopropanes (azide-MCPs) underwent an intermolecular cyclization with isonitriles catalyzed by a Rh(II) complex to produce a series of pyrrolo[2,3-b]quinolines in moderate to good yields via carbodiimide intermediates. Moreover, synthetic applications of these products to construct structurally novel and useful heterocycles have also been achieved.
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Chen et al. (2015) studied this question.
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