A practical and efficient ligand-free MnO₂ mediated sequential oxidation and olefination has been developed for the facile synthesis of a broad range of unsaturated N-heteroazaarenes from simple alkyl-substituted heteroarenes and alcohols. The procedure tolerates a series of functional groups, such as methoxyl, chloro, bromo, iodo, vinyl, phenolic and hetero groups, providing the olefination products in moderate to good yields.The protocol could be conducted at mild conditions and used environmentally friendly air as the clear oxidant.

中文翻译：

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MnO ₂介导的烷基取代杂芳烃与醇的顺序氧化/烯化

已经开发了一种实用且有效的无配体的MnO ₂介导的顺序氧化和烯烃化反应，用于从简单的烷基取代的杂芳烃和醇类轻松合成各种不饱和N-杂氮杂芳烃。该方法可耐受一系列官能团，例如甲氧基，氯，溴，碘，乙烯基，酚基和杂基，可提供中等至良好收率的烯化产物。该方案可在温和条件下进行，并使用环境友好的空气作为溶剂。清澈的氧化剂。