Abstract
Several derivatives of the new pyrazolo[4,3:5,6]pyrimido[2,l-a]-isoindolone ring system (4) have been prepared through heterocyclization of 2-chloromethylbenzoyl chloride (1) with appropriately substituted 5-amino-1H-pyrozole-4-carbonitriles (2). The reaction intermediate inden-2-yl-1-phenyl-pyrazole-4-carbonitrile (3), on subjection to acid or base, underwent hydrolysis and cyclocondensation simultaneously to afford the tetracyclic compound (4).
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