SYNTHESIS OF 2H-INDAZOLO [1,2-B] PHTHALAZINE-TRIONE DERIVATIVES, HAS EMERGED AS A POWERFUL TOOL IN ORGANIC SYNTHESIS DUE TO THEIR WIDE RANGE OF BIOLOGICAL ACTIVITIES SUCH AS CARDIOTONIC AND VASORELAXANT [1-3]. HETEROCYCLES CONTAINING THE PHTHALAZINE MOIETY ARE A CLASS OF COMPOUNDS, WHICH ARE HIGHLY RECOGNIZED IN THE FIELD OF MEDICINE AND ORGANIC CHEMISTRY DUE TO THEIR ANTIMICROBIAL, ANTICONVULSANT, ANTIFUNGAL , ANTICANCER AND ANTI-ANXIETY DRUG [4,5]. A NEW, SIMPLE AND EFFICIENT PROTOCOL IS USED FOR SYNTHESIS OF 2H-INDAZOLO [2,1-B] PHTHALAZINE TRIONES BY THREE COMPONENT CONDENSAION REACTION OF PHTHALHYDRAZIDE, AROMATIC ALDEHYDES AND CYCLIC DIKETONE (DIMEDONE) USING AL-SBA15/TPI/H6P2W18O62 UNDER SOLVENT-FREE CONDITIONS IN GOOD TO EXCELLENT YIELDS AND SHORT REACTION TIME .THE STRUCTURE OF THE PRODUCTS WERE CHARACTERIZED BY FURRIER TRANSFORM INFRARED SPECTROSCOPY (FT-IR). STABILITY, HIGHER ACIDITY AND ACTIVITY, AS WELL AS POWER METAL DISPERSION DUE TO THE HIGHER ACTIVITY OF THE CATALYST ARE ACHIVED BY EMPLOYING THIS NANO CATALYST. MOREOVER, THIS NANO CATALYST HAS EASY WORK UP UNDER HETEROGENEOUS CATALYTIC SYSTEMS WHICH INTENSIFY REACTION RATE AND ALSO CAUSES THE CATALYST TO BE SEPARATED EASILY FROM THE REACTION PRODUCTS, RECYCLED AND REUSED SEVERAL TIMES WITHOUT SIGNIFICANT LOSS OF ACTIVITY. THE STRUCTURE OF THE CATALYSTS (SIZE, SHAPE, SURFACE MORPHOLOGY) WERE CHARACTERIZED BY X-RAY DIFFRACTION (XRD) AND SCANNING ELECTRON MICROSCOPY (SEM).