Synthesis and antimicrobial activity of azepine and thiepine derivatives

A series of new pyridobenzazepine and pyridobenzothiepine derivatives was synthesized by Pd-catalyzed formation of C-N and C-S bonds. All synthesized compounds were tested for their in vitro antimicrobial activity. The pyridobenzazepine derivatives showed better antibacterial and antifungal activity than the corresponding dipyridoazepine analogue. Among the synthesized azepines, derivative 8 displayed potent activity against the tested bacteria (MIC ranged 39-78 mu g mL(-1)), while azepine 12 showed promising antifungal activity (MIC ranged 156-313 mu g mL(-1)). The synthesized thiepine derivatives exhibited weak antibacterial activity, but showed pronounced antifungal activity.