Reaction of phthalic acid with 2-methyl-4-N-phenylaminoquinoline under PPA condition resulted in the formation of 6-methyldibenzo[b,h][1,6]naphthyridines, whereas the same reaction with 2,4-bis(N-phenylamino)quinoline resulted in the dimeric dibenzo[b,h][1,6]naphthyridines. A novel mechanism has been proposed to explain the formation of the unexpected product. Screening for the antibacterial activity against various pathogens, proved that the dimeric analogs showed a better antibacterial activity when compared to their monomeric analogs.
在多聚
磷酸条件下,
酞酸与2-甲基-4-N-苯
氨基
喹啉反应生成6-甲基二苯并[b,h][1,6]
萘啶,而相同的反应中,
酞酸与2,4-双(N-苯
氨基)
喹啉则生成二聚二苯并[b,h][1,6]
萘啶。为了解释这种意外产物的形成,提出了一种新的反应机制。对多种病原体的抗菌活性筛选证明,与单体类似物相比,二聚体类似物显示出更强的抗菌活性。