An unprecedented synthesis of functionalized naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines via rhodium-catalyzed cascade reactions of 2-arylimidazo[1,2-a]pyridine-3-carbaldehydes with cyclic α-diazo-1,3-diketones is presented. To our knowledge, this is the first example in which the title compounds were prepared through Rh(III)-catalyzed C–H bond carbenoid insertion and [5 + 1] annulation by using cyclic α-diazo-1,3-diketones as a C1 synthons featuring with a ring-opening and reannulation. Notably, a wide range of substrates and functional groups were well-tolerated under the optimized reaction conditions to produce products in good to excellent yields.

中文翻译：

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通过Rh（III）催化2-芳基咪唑并[1,2-a]吡啶与环2-的合成反应合成萘并[1'，2'：4,5]咪唑并[1,2-a]吡啶重氮-1,3-二酮，具有开环和重新环化的特征

官能化萘的合成前所未有[1'，2'：4,5]咪唑并[1,2一]吡啶通过铑催化的2芳基咪唑并[1,2的级联反应一]吡啶-3- carbaldehydes与环状提出了α-重氮-1,3-二酮。据我们所知，这是第一个实例，其中标题化合物是通过Rh（III）催化的C–H键类固醇插入并通过使用环状α-重氮-1,3-二酮作为[5 +1]环化制备的。 C1合成子具有开环和重新环化的特征。值得注意的是，在优化的反应条件下，广泛的底物和官能团具有良好的耐受性，可生产出具有良好收率的产品。