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Shows efficient synthesis of highly substituted pyridines, suggesting a novel synthetic route.
A copper-catalyzed [4 + 2] annulation protocol from readily available α,β-unsaturated ketoximes and dialkyl acetylenedicarboxylates has been achieved. The approach enables the expedient construction of a series of structurally new highly substituted pyridines with good functional group tolerance.
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He et al. (2025) studied this question.
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