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A series of novel 1,3,4‐thiadiazoles, 1,2,4‐triazoles, and 1,3,4‐oxadiazoles were synthesized by cyclization of substituted 1‐(2‐(2‐chlorophenyl)‐2‐(4‐(2,3‐dichlorophenyl)piperazin‐1‐yl)acetyl)thiosemicarbazide. The structures of all newly synthesized compounds were elucidated on the basis of spectral studies. Some of them were screened for their antibacterial activity. The compounds 6b, 6c, 8e, 9a, and 9b have shown moderate activity towards Bacillus Subtilis and Escherichia Coli.

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The o,o'‐dihydroxybenzils (I) undergo twofold cyclocondensation with the ethoxycarbonylmethylenephosphorane (II), forming the bicoumarins (III).