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Pyrazolo[3,4-b]pyridine, the base chemical structure of this class. The pyrazolopyridines are a group of drugs investigated as anxiolytics which act as positive allosteric modulators of the GABA A receptor via the barbiturate binding site. [1] [2] They include the following compounds: Cartazolate (SQ-65,396) Etazolate (SQ-20,009) ICI-190,622 ...
Two isomers exist, the 2,3-pyridine (2,3-didehydropyridine) and the 3,4-pyridyne (3,4-didehydropyridine). The reaction of 3-bromo-4-chloropyridine with furan and lithium amalgam gives 1,4-epoxy-dihydroquinoline through the 2,3-pyridyne intermediate. The reaction of 4-bromopyridine with sodium in liquid ammonia gives both 3-aminopyridine and 4 ...
Bipyridines are a family of organic compounds with the formula (C 5 H 4 N) 2, consisting of two pyridyl (C 5 H 4 N) rings. Pyridine is an aromatic nitrogen-containing heterocycle. The bipyridines are all colourless solids, which are soluble in organic solvents and slightly soluble in water. Bipyridines, especially the 4,4' isomer, are mainly of ...
4,4′-Bipyridine (abbreviated to 4,4′-bipy or 4,4′-bpy) is an organic compound with the formula (C 5 H 4 N) 2. It is one of several isomers of bipyridine. It is a colorless solid that is soluble in organic solvents. is mainly used as a precursor to N,N′-dimethyl-4,4′-bipyridinium [(C 5 H 4 NCH 3) 2] 2+, known as paraquat.
Imidazo[1,2-a]pyridines: Alpidem (original brand name Ananxyl)—an anxiolytic that was withdrawn from the market worldwide in 1995 due to hepatotoxicity. DS-1—a GABA A receptor positive allosteric modulator selective for the α 4 β 3 δ subtype, which is not targeted by other GABAergics such as benzodiazepines or other nonbenzodiazepines. [1]
4-Pyridone exists a keto-enol tautomerism with its enol tautomer 4-hydroxypyridine. In solution , the keto tautomer is favoured, [ 4 ] and the enol tautomer only becomes important in very dilute solutions or solutions of non-polar solvents.
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