Antidopaminergic effects of the stereoisomers of N-[(1-alkyl-2-pyrrolidinyl)methyl]-5-sulfamoylbenzamides and -2,3-dihydro-benzofuran-7-carboxamides
摘要:
The stereoisomers of some N-[(1-alkyl-2-pyrrolidinyl)methyl]5-sulfamoylbenzamides (3-8) and -2,3-dihydrobenzofuran-7-carboxamides (9-18) were prepared to compare their dopamine D2 receptor binding affinities (in vitro) and inhibitory effects on apomorphine-induced hyperactivity (in vivo). In the 1-ethyl substituted compounds of the two series, the stereoisomers with S absolute configuration at the 2-position of the pyrrolidine moiety (S enantiomer 3 and 2S diastereomers 9 and 10) were more potent in both of the above activities than those with R absolute configuration (R enantiomer 4 and 2R diastereomers 11 and 12, respectively), whereas the R enantiomer (8) was more potent than the S enantiomer (7) in the 1-n-hexyl-substituted-benzamides and the 2R diastereomers (15, 16, and 18) were more potent than the 2S diastereomers (13, 14, and 17) in the 1-n-butyl- and 1-n-hexyl-2,3-dihydrobenzofuran-7-carboxamies. It was found that the stereospecificity of the compound activities altered from the S configuration to the R configuration as the 1-alkyl side chain became longer in the two series. How these stereoisomers meet the configurational requirements to interact with the dopamine D2 receptors is also discussed.
Antidopaminergic effects of the stereoisomers of N-[(1-alkyl-2-pyrrolidinyl)methyl]-5-sulfamoylbenzamides and -2,3-dihydro-benzofuran-7-carboxamides
摘要:
The stereoisomers of some N-[(1-alkyl-2-pyrrolidinyl)methyl]5-sulfamoylbenzamides (3-8) and -2,3-dihydrobenzofuran-7-carboxamides (9-18) were prepared to compare their dopamine D2 receptor binding affinities (in vitro) and inhibitory effects on apomorphine-induced hyperactivity (in vivo). In the 1-ethyl substituted compounds of the two series, the stereoisomers with S absolute configuration at the 2-position of the pyrrolidine moiety (S enantiomer 3 and 2S diastereomers 9 and 10) were more potent in both of the above activities than those with R absolute configuration (R enantiomer 4 and 2R diastereomers 11 and 12, respectively), whereas the R enantiomer (8) was more potent than the S enantiomer (7) in the 1-n-hexyl-substituted-benzamides and the 2R diastereomers (15, 16, and 18) were more potent than the 2S diastereomers (13, 14, and 17) in the 1-n-butyl- and 1-n-hexyl-2,3-dihydrobenzofuran-7-carboxamies. It was found that the stereospecificity of the compound activities altered from the S configuration to the R configuration as the 1-alkyl side chain became longer in the two series. How these stereoisomers meet the configurational requirements to interact with the dopamine D2 receptors is also discussed.