Synthesis of Some Spiro Indeno[1,2-b]pyrido[2,3-d]Pyrimidine-5,3′-Indolines as New Urease Inhibitors

New series of spiro indeno[1,2-b]pyrido[2,3-d]pyrimidine-5,3'-indolines as new urease inhibitors were synthesized by the catalytic procedure in high yield and short reaction time. In this method, biacidic carbon was prepared as a novel heterogeneous acid and was subsequently used as an efficient catalyst. The inhibitory activities of synthesized compounds… CONTINUE READING