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Cartazolate
Cartazolate (SQ-65,396) is a drug of the pyrazolopyridine class. It acts as a GABAA receptor positive allosteric modulator at the barbiturate binding site of the complex and has anxiolytic effects in animals. It is also known to act as an adenosine antagonist at the A1 and A2 subtypes and as a phosphodiesterase inhibitor. Cartazolate was tested in human clinical trials and was found to be efficacious for anxiety but was never marketed. It was developed by a team at E.R. Squibb and Sons in the 1970s.〔US Patent 3966746 Amino derivatives of pyrazolopyridine carboxamides〕
==Synthesis==
Condensation of aminopyrazole (1) with Diethyl ethoxymethylenemalonate (2) gives the product of the addition-elimination (3). The product tautomerizes spontaneously to the hydroxypyridine (4). The hydroxyl group is then converted to the chloro derivative by means of phosphorus oxychloride (5) Displacement of halogen by n-butylamine gives the antidepressant compound cartazolate. Displacement of halogen by the basic nitrogen of acetone hydrazone〔http://www.orgsyn.org/demo.aspx?prep=cv6p0010〕 affords the antidepressant etazolate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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