ONE-POT, THREE-COMPONENT, GREEN SYNTHESIS OF SOME INDENO[2`,3`:5,6] PYRIDO[2,1-b]BENZOTHIAZOLES AND INDENO[2`,3`-e]THIAZOLO[3,2 a]PYRIDINES ONE-POT, Drei-Komponenten, GREEN Synthese einiger INDENO [2 `, 3`: 5,6] pyrido [2,1-b]Benzothiazole und INDENO [2 `, 3`-e] THIAZOLO [3,2 a] PYRIDINE

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 indan- 1,3-dion (1), aromatic aldehydes (2a-f), (benzothiazol-2-yl)acetonitrile (3) or 2-cyanomethyl-4- thiazolinone (5), and catalyzed by p-toluene sulfonic acid (p-TSA) using water as reaction medium is reported.