An unprecedented base promoted domino approach has been developed for the synthesis of pyridin-2-yl urea derivatives via the reaction of 2-aminopyridinium salts and arylamines. The developed strategy tolerated a wide range of functional groups and afforded pyridin-2-yl ureas in moderate to good yields. The reaction was postulated to involve tandem cyclization, intermolecular nucleophilic addition, ring opening, and demethylation.

中文翻译：

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由2-氨基吡啶鎓盐无金属合成吡啶-2-基脲

通过2-氨基吡啶鎓盐和芳基胺的反应合成吡啶-2-基脲衍生物，已经开发出了前所未有的碱促进多米诺骨牌方法。所开发的策略可耐受各种官能团，并以中等至良好的产率提供吡啶-2-基脲。假定该反应涉及串联环化，分子间亲核加成，开环和去甲基化。