Synthesis and antimicrobial activity of some bis-quinazoline derivatives.

The hitherto unknown bis[quinazolin-4-one-2-yl]-m-phenylene (2d), and its 3-N-substituted derivatives were prepared from the corresponding bis[3,1-benzoxazin-4-one-2-yl]-m-phenylene (1) as precursor. The quinazolinone derivative 2d was converted into bis[quinazolin-4-thioxo-2-yl]-m-phenylene (3) via different routes, bis[4-chloroquinazolin-2-yl]-m-phenylene (8) and bis[4-hydrazinoquinazolin-2-yl]-m-phenylene (11), respectively. The structures of the compounds 2, 3, 8, and 11 were supported by elemental, spectroscopic analysis as well as, chemical proofs. Biological activities of some of the produced compounds were evaluated.