Development of Synthetic Methodology for Multi-substituted Heterocycles via Benzyne Intermediate and Its Application for Natural Product Synthesis

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Synthetic methodology for multi-substituted heterocycles was developed utilizing the high reactivity of benzyne intermediate. Magnesium bisamide was proved to be the best base for the benzyne generation and nucleophilic addition to construct heterocyclic skeletons. The resulting anion species reacted with a variety of electrophiles to give functionalized heteroaromatic compounds. The tricyclic skeleton of isobatzelline and discorhabdins was constructed using the reaction conditions.