Pyridazine Analogues of Biologically Active Compounds, VI1,2): Pyrido[2,3-c]pyridazines Structurally Related to Nalidixic Acid
作者:Philip Y. Boamah、Norbert Haider、Gottfried Heinisch
DOI:10.1002/ardp.19903230405
日期:——
Synthesis of 8‐alkyl‐5,8‐dihydro‐5‐oxopyrido[2,3‐c]pyridazine‐6‐carboxylic acids 7a–d, starting from 3‐chloro‐4‐pyridazinecarbonitrile, is reported. The novel compounds do not exhibit significant (gyrase‐inhibiting) antibacterial activity.
A series of 4-aminomethylpyridazines and -pyridazin-3(2H)-ones (“diaza-benzylamines”), bearing alkylamino side chains in ortho position relative to the CH2NH2 unit, was synthesized by catalytic hydrogenation of the corresponding nitriles in strongly acidic medium. N-Benzyl protecting groups either at the pyridazinone ring nitrogen or at an exocyclic nitrogen were selectively removed hydrogenolytically or by treatment with a Lewis acid. The new compounds were tested in vitro for semicarbazide-sensitive amine oxidase (SSAO) inhibitory activity and 4-(aminomethyl)-N,N′-diethylpyridazine-3,5-diamine (22) was found to be the most active representative.