A gold(I)/Brønsted acid‐catalyzed cyclization of 2‐azidobenzaldehydes with 3‐aza‐1,6‐enynes has been developed for the synthesis of tetrahydrobenzo[b][1,8]naphthyridine derivatives. This protocol enabled the modular synthesis of tetracyclic heterocycles in one operation with water and nitrogen gas as the byproducts.

中文翻译：

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合并金催化和布朗斯台德酸催化合成四氢苯并[b] [1,8]萘啶

已经开发了金（I）/布朗斯台德酸催化的3-叠氮基-1,6-炔烃对2-叠氮基苯甲醛的环化反应，以合成四氢苯并[ b ] [1,8]萘啶衍生物。该方案能够在一次操作中以水和氮气为副产物，以模块化方式合成四环杂环。