Abstract
The green synthesis of some indeno[2', 3': 5,6] pyrido[2,1-b] benzothiazoles (4a-f) and indeno[2', 3'-e] thiazolo[3,2-a] pyridines (6a-f) via a one-pot, three-component reaction of indan1,3-dion (1), aromatic aldehydes (2a-f), (benzothiazol-2-yl) acetonitrile (3) or 2-cyanomethyl-4thiazolinone (5), and catalyzed by p-toluene sulfonic acid (p-TSA) using water as reaction medium is reported.