Unique dual‐emissive and deep‐blue/green fluorescent multi‐substituted 4‐azapyrenes with bathochromic shift emission, quantum yields up to 0.60 and long excited‐state lifetime were synthesized successfully by annulative π‐extension reactions. This synthesis constitutes a palladium‐catalyzed dehydrogenative annulation of N‐acyl‐2‐aminobiaryls with in situ 1,3‐diynes as a key step, giving substituted phenanthrenes via a rollover C−H bond activation, followed by Bischler‐Napieralski cyclization. Further π‐extension by superacid‐mediated cyclization produced a blue fluorescent naphtho 4‐azapyrene.

中文翻译：

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钯（II）催化的双CH键活化和环化反应合成4-氮杂荧光酮

通过环状π扩展反应成功合成了具有红移位移，独特的双发射和深蓝/绿色荧光的多氮杂4-氮杂蒽，具有红移位移发射，量子产率高达0.60，激发态寿命长。该合成构成了N-酰基-2-氨基联芳的钯催化脱氢环化反应，关键步骤是原位1,3-二炔，通过翻转的C-H键活化产生取代的菲，然后进行Bischler-Napieralski环化反应。超强酸介导的环化作用进一步使π-延伸产生了蓝色的荧光萘4-氮杂ap。