A convenient synthesis of 2‐Arylidene‐5H‐thiazolo[2,3‐b]quinazo‐line‐3,5[2H]‐diones and their benzoquinazoline derivatives

Various 5H‐thiazolo[2,3‐b]quinazoline‐3,5[2H]‐diones (7a,b), 2‐arylidene‐5H‐thiazolo[2,3–b]quin‐azoline‐3,5[2H]‐diones (9a‐o) and 2‐arylidene‐5H‐thiazolo[2,3‐b]benzoquinazoline‐3,5[2H]‐diones (12a,b) have been synthesized via simple and efficient methods.