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Mosapramine (1) is a new neuroleptic drug with an asymmetric carbon atom (8a) in its imidazopyridine ring. The enantiomers of this agent were synthesized to compare their biological activities, such as antiapomorphine activity, affinity for dopamine D2 receptor and acute toxicity. The key intermediates, (R)-(-)- and (S)-(+)-2-oxo-1,2,3,5,6,7,8,8a-octahydroimidazo[1,2-a]pyridine- 3-spiro-4'-piperidines, were prepared by optical resolution of the corresponding (+/-)-compound and were treated with 3-chloro-5-(3-methanesulfonyloxypropyl)-10,11-dihydro-5H-dibenz[b, f]azepine to afford (R)-(-)-1 and (S)-(+)-1, respectively. There were few differences in the examined biological activities of the two enantiomers as their dihydrochlorides.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Syntheses and Biological Activities of Optical Isomers of 3-Chloro-5-(3-(2-oxo-1,2,3,5,6,7,8,8a-octahydroimidazo(1,2-a)pyridine-3-spiro-4'-piperidino)propyl)-10,11-dihydro-5H-dibenz(b,f)azepine (Mosapramine1)) Dihydrochloride.