Patent ES-8602655-A1 (ES)
Title: Piperidine derivatives, processes for their preparation and pharmaceutical preparation containing them.
IPC: C07D211/26
Filed: 1984-03-01
Abstract: Pure enantiomers of a m-(N-propyl-3-piperidinyl) phenol or deriv. of formula (I) and their acid-addn. salts are new. The enantiomers have the same absolute configuration at the asymmetric C atom in posn. 3 of the piperidine ring as that of the (-)-enantiomer of the cpd. in which Y is OH. (Y is OH, R1COO, R2R3NCOO or R4O; R is a 1-17C aliphatic hydrocarbyl gp., Ph, 2,6-Me2C6H3, 3- or 4-HOC6H4, 3- or 4-(2-7C)alkanoyloxyphenol or CHR6-NR7R8; R6 is H, 1-5C alkyl or Ph; R7 is H, 1-5C alkyl or acyl; R8 is H or 1-5C alkyl; R2 is H, 1-5C alkyl, a phenethyl, benzyl or phenyl gp. opt. ring substd. by 1 or 2 Me, MeO, OH, NO2, CN or halogen; R3 is H, 1-5C alkyl or Ph; or NR2R3 is an 5-to 7-membered ring opt. contg. 1,2 or 3 double bonds and/or 1 or 2 further heteroatoms selected from N, O or S; and R4 is allyl or benzyl). - Cpds. (I) are centrally acting selective dopamine autoreceptor stimulating agents, and so are useful for treating psychotic disorders such as schizophrenia and other disease states such as tardive dyskinesia, Huntington's chorea, alcoholism and drug abuse, which may be associated with an increase in  central dopamine transmission. Extrapyramidal motor disturbances of choreatic type are avoided. The enantiomers have a better efficacy than the racemates because of an unexpected post-synaptic dopamine antagonist activity as well as the presynaptic activity. EPAB- EP--97628 B A pure enantiomer of a compound of formula I wherein Q is H, R'CO-, R2R3N-CO-, alkyl or benzyl; wherein R' is C1-17 aliphatic hydrocarbyl, phenyl, 2,6-dimethyphenyl, 3- or 4-hydroxyphenyl, 3- or 4-(C2-7 alkanoyloxy)phenyl, or-CHR6-NR7R8 wherein R6 is H, C1-5 alkyl or phenyl, R7 is H,C1-5 alkyl, formyl, acetyl, benzoyl, methoxycarbonyl, phenoxycarbonyl or benzyloxycarbonyl, and R8 is H or C1-5 alkyl; and either R2 is H, C1-5 alkyl, or a phenethyl, benzyl or phenyl group which may be mono- or di-ring-substituted by methyl, methoxy, hydroxy, nitro, cyano or a haogen atom, and R3 is H, C1-5 alkyl or phenyl, or NR2R3 is a 5, 6 or 7-membered ring that may contain 1 to 3 double bonds and/or 1 or 2 further heteroatoms selected from N, O and S; said enantiomer having the same absolute configuration at the asymmeric carbon atom asterisk as that of the (-)-enantiomer of the compound of ofrmula I wherein Q is H; or a pharmaceutically-acceptable acid addition salt thereof.  (12pp) GBAB- GB2117771 B Pure enantiomers of a m-(N-propyl-3-piperidinyl) phenol or deriv. of formula (I) and their acid-addn. salts are new. The enantiomers have the same absolute configuration at the asymmetric C atom in posn. 3 of the piperidine ring as that of the (-)-enantiomer of the cpd. in which Y is OH. (Y is OH, R1COO, R2R3NCOO or R4O; R is a 1-17C aliphatic hydrocarbyl gp., Ph, 2,6-Me2C6H3, 3- or 4-HOC6H4, 3- or 4-(2-7C)alkanoyloxyphenol or CHR6-NR7R8; R6 is H, 1-5C alkyl or Ph; R7 is H, 1-5C alkyl or acyl; R8 is H or 1-5C alkyl; R2 is H, 1-5C alkyl, a phenethyl, benzyl or phenyl gp. opt. ring substd. by 1 or 2 Me, MeO, OH, NO2, CN or halogen; R3 is H, 1-5C alkyl or Ph; or NR2R3 is an 5-to 7-membered ring opt. contg. 1,2 or 3 double bonds and/or 1 or 2 further heteroatoms selected from N, O or S; and R4 is allyl or benzyl). - Cpds. (I) are centrally acting selective dopamine autoreceptor stimulating agents, and so are useful for treating psychotic disorders such as schizophrenia and other disease states such as tardine dyskinesia, Hungington's chorea, alcoholism and drug abuse, which may be associated with an increase in  central dopamine transmission. Extrapyramidal motor disturbances of choreactic type are avoided. The enantiomers have a better efficacy than the racemates because of an unexpected post-synaptic dopamine antagonist activity as well as the presynaptic activity.  (14pp)