Psychotropic agents. II. Synthesis and psychotropic activity of conformationally restricted butyrophenone analogs.

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In order to search for new psychotropic agents, several conformationally restricted analogs (see Chart 1D) of haloperidol or benperidol were synthesized. cis-and trans-1-[2- (2-Phenylcyclopropyl) ethyl] piperidine derivatives (Xa, Xb, and XXIV) were prepared in several steps from the corresponding cis-and trans-1-phenyl-1-butene derivatives (III and XX). The effect of the compounds on spontaneous motor activity in mice was determined. trans-Isomer (Xb), which was the most active compound, was about 11 times more active than cis-isomer (XXIV). But the activity of Xb was about one-fifth as potent as benperidol. Structure-activity relationships of these compounds are discussed.

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