ChemInform Abstract: Diastereoselective Synthesis of (Z)‐6‐(2‐Oxo‐1,2‐dihydro‐3H‐indol‐3‐ylidene) ‐3,3a,9,9a‐tetrahydroimidazo[4,5‐e]thiazolo [3,2‐b]‐1,2,4‐triazin‐2,7(1H,6H)‐diones.

Abstract Aldol‐crotonic condensation of compounds (I) with isatin derivatives [(II) or (IV), resp.] is accomplished according to recently reported procedure under acidic catalysis.