Synthesis of Fluorescent 4‐Azapyrenes by Palladium(II)‐Catalyzed Dual C−H Bond Activation and Annulation
作者:Huan‐Chang Hsiao、Pratheepkumar Annamalai、Jayachandran Jayakumar、Shang‐You Sun、Shih‐Ching Chuang
DOI:10.1002/adsc.202001404
日期:2021.3.16
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
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。