An unprecedented base-promoted multi-component one-pot dearomatization of N-alkyl activated azaarenes was developed, which enabled the synthesis of complex and diverse bridged cyclic polycycles with multiple stereocenters in a highly regio- and diastereoselective manner. Besides, we realized the step-controlled dearomative bi- and trifunctionalization of quinolinium salts. These transformations not only achieved the maximization of the reaction sites of pyridinium, quinolinium and isoquinolinium salts to enhance structural complexity and diversity, but also opened up a new reaction mode of these N-activated azaarenes. A unique feature of this strategy is the use of easily accessible and bench-stable N-alkyl activated azaarenes to provide maximum reactive sites for dearomative cascade cyclizations. In addition, the salient characteristics including high synthetic efficiency, short reaction time, mild conditions and simple operation made this strategy particularly attractive.

中文翻译：

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N-烷基活化的氮杂芳烃的区域和非对映选择性脱芳香化作用：反应位点的最大化

开发了空前的由N-烷基活化的氮杂氮杂促进的多组分一锅脱芳烃的一锅脱芳香化反应，其能够以高度区域选择性和非对映选择性的方式合成具有多个立体中心的复杂多样的桥连环状多环。此外，我们实现了喹啉鎓盐的分步控制脱芳香双-和三官能化。这些转变不仅实现了吡啶鎓，喹啉鎓盐和异喹啉鎓盐的反应位点的最大化以增强结构的复杂性和多样性，而且开辟了这些N-活化的氮杂芳烃的新反应模式。此策略的独特之处在于使用易于访问且稳定的N-烷基活化的氮杂芳烃为脱芳基的级联环化提供最大的反应性位点。此外，包括高合成效率，较短的反应时间，温和的条件和简单的操作在内的显着特征使该策略特别引人注目。