An efficient and practical procedure for the synthesis of 2-benzoyl-6-(3-arylsydnon-4-yl)-4-aryl-2,3a,4,5-tetrahydro- 3H-indazol-3-ones (4f-o) using inexpensive silica perchloric acid as heterogenous catalyst is described. The use of catalyst increased the yield of the product. The antimicrobial screening for the title compounds was carried out.
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