Chemistry of Heterocyclic Compounds p. 1039 - 1048 (1985)
Update date:2022-08-05
Topics:
Turchin, K. F.
Yanina, A. D.
Filipenko, T. Ya.
Mikhlina, E. E.
Sheinker, Yu. N.
Yakhtonov, L. N.
It was shown by means of 1H and 13C NMR spectroscopy that the reaction of 2-arylmethylene-3-oxoquinuclidines with hydrazine hydrate gives 4a-hydroxy-7-aryl-4a,5,7,7a-tetrahydropyrazolo<4,3-b>quinuclidines, which are stable in the crystalline state but undergo dehydration to the corresponding 7-aryl-6H-7,7a-dihydropyrazolo<4,3-b>quinuclidines in solutions.The latter undergo cleavage to the 3-(4-piperidyl)-5-arylpyrazoles when they are heated in an alkaline medium.
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