Quinoline is a constituent in the structure of many biologically active compounds. Thus, there are more than 300 quinoline alkaloids isolated from plants of 14 families (Rutaceae, Rubiaceae, Compositae et al.), certain microorganisms, and animals [1]. These alkaloids possess a wide spectrum of biological activity: act as central nervous system depressants, affect thermoregulatory centers, decrease cardiac excitability, excite the uterine muscle. Consequently, a number of active substances containing the quinoline ring within their structure is used in medicine, such as chloroquine (immunosuppressive, anti-inflammatory, antimalarial action), quinidine (an antiarrhythmic agent), echinopsine (a general stimulant), nitroxoline (5-Nok, antibacterial), fluoroquinolones (antibacterial action) [2,3]. Compounds with both growth stimulating and growth suppressing activity on certain plants have been identified in the quinoline series [4].It has previously been shown that the interaction of 4-acyl-5-aryl-3-hydroxy-3-pyrrolin-2-ones with binucleophiles can produce a plethora of fused heterocyclic ring systems: pyrrolo [3,4-c]pyrazol-6-ones [5, 6], pyrrolo[3,4-f][1,4]diazepines [5], pyrrolo[3,4-c]pyrimidines [7, 8], pyrrolo[2,3-b]quinoxalines [9, 10], pyrrolo[3,4-b][1,5]benzodiazepines [11], 3,4-dihydroquinoxalin-2(1H)-ones [12]. It has also been found that 3-aryl-5-arylamino-4-benzoyl-1H-3-pyrrolin-2-ones by brief heating with concentrated H 2 SO 4 followed by keeping the reaction mixture at room temperature for long periods undergo intramolecular cyclization to form 5(7)-R-1-aryl-9-phenylpyrrolo[3,4-b]quinolin-3-ones [13].