A metal-free approach towards synthesis of β-carboline C1 substituted Pyrido(2,3-c)carbazole derivatives (nitramarine analogues) through A3-coupling and estimation of their light emitting properties

A simple and efficient metal-free methodology is presented to access fluorescent β-carboline tethered pyrido(2,3-c)carbazole derivatives (Nitramarine analogues) via A3-coupling of 1-formyl-9H-β-carbolines, 3-amino-9-ethylcarbazole, and terminal alkynes. The advantages of this approach are operationally simple procedure, use of non-toxic and inexpensive catalyst (I2), broad substrate scope, and good yields of products. Moreover, these products showed excellent luminescent properties with quantum yield (ΦF) up to 60%.