Urea derivatives of spirocyclic piperidines endowed with antibacterial activity

Antimycobacterial activity of certain ureas as well as spirocyclic piperidines described in the literature prompted us to synthesize and test a series of hybrids of spirocyclic piperidine with ureas. Surprisingly, no activity was detected against Mycobacterium tuberculosis. However, significant antibacterial activity was identified and confirmed against common gram-positive as well as gram-negative bacteria.