Stitching ynones with indolin-2-thiones: An eco-friendly reaction cascade towards functionalized thiopyrano[2,3-b]indoles and their inceptive optoelectronic profiling

Abstract

A sustainable approach embodying many green features and leading to tricyclic thiopyrano[2,3-b]indole system through base-mediated stitching of ynones with indolin-2-thiones via tandem Knoevenagel condensation, 6π-electrocyclization, 1,5-H shift reaction cascade has been observed and generalised. Initial optoelectronic profiling of these new entities reveals potential as blue light emitters for organic light-emitting diodes (OLED).