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Efficient synthesis of a series of pyrazolylbiscoumarin (4a -4e) and pyrazolylxanthenedione derivatives (5a -5e) is described. The structures of the synthesized compounds were confirmed by their spectral data (IR, 1 HNMR and 13 CNMR). All the synthesized compounds 4 and 5 were screened for their antibacterial activity against Gram-positive bacteria S. aureus and Gram-negative bacteria K. pneumoniae. The tested compounds exhibited varying degree of antibacterial activity, showing the inhibition zone size ranging from 6 to 21 mm.

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