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A series of novel pyranochromene-containing tetrazoles fused with pyrimidinethiones, pyrimidines, and diazepines  3a–f ,  4a–f , and  5a–f  were synthesized by condensation of the corresponding tetrazoles  2a–f  with carbon disulfide, benzaldehyde, and 4-methoxy phenacyl bromide, respectively. The compound  2a–f  was obtained by reaction of pyrano[3,2- c ]chromenes  1a–f  with sodium azide. The structures of the newly synthesized compounds  2a–f  to  5a–f  were established on the basis of their elemental analyses, IR,  1 H NMR,  13 C NMR, and mass spectral data. All of the title compounds were subjected to  in vitro  antibacterial testing against four pathogenic strains and antifungal screening against two fungi. Preliminary results indicate that some of them exhibited promising activities and that they deserve more consideration as potential antimicrobials.

Design, Synthesis, and In Vitro Antimicrobial Evaluation of Fused Pyrano[3,2-e]tetrazolo[1,5-c]pyrimidines and Diazepines