Herein, we report a greener protocol for the C(sp<sup>2</sup>)-H bond azo coupling of imidazo-heteroarene with aryl diazonium salts, catalyzed by eosin Y, under acid free conditions. This direct photoredox, eco-friendly and efficient approach afforded the desired products in good to excellent yields. The key features of this protocol are that it provides high yields and is atom-economic, gram-scalable and applicable to biologically relevant imidazo-heteroarenes.

Photo-induced direct C(sp<sup>2</sup>)-H bond azo coupling of imidazo-heteroarenes with aryl diazonium salts

2019 Spring National Meeting

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Photo-induced direct C(sp2)-H bond azo coupling of imidazo-heteroarenes with aryl diazonium salts

Photo-induced direct C(sp²)-H bond azo coupling of imidazo-heteroarenes with aryl diazonium salts