An Efficient Synthesis and Fluorescent Properties of Pyrazole[3,4‐<i>b</i>]thieno[2,3‐<i>e</i>]pyridine Derivatives

Abstract

A simple and efficient method for the synthesis of pyrazole[3,4‐ b ]thieno[2,3‐ e ]pyridine derivatives via the sequence of three‐component, catalyst‐free, and solvent‐free condensation and oxidation was described. The products feature a donor‐π‐conjugated acceptor fluorescent activity system, and the fluorescence emission wavelength was measured in methanol. Some products were fluorescent in solution emitting at blue light (λ em = 430–505 nm).