Novel (4-Phenylpiperidinyl)- and (4-Phenylpiperazinyl)alkyl-Spaced Esters of 1-Phenylcyclopentanecarboxylic Acids as Potent .sigma.-Selective Compounds
摘要:
A series of novel 4-phenylpiperidinyl and (4-phenylpiperazinyl) alkyl 1-phenylcyclopentanecarboxylates was synthesized and evaluated for affinity at sigma(1) and sigma(2) sites by inhibition of [H-3]-(+)-pentazocine (PENT) and [H-3]-1,3-di(2-tolyl)guanidine (DTG) binding in guinea pig brain. The phenylpiperidines were more potent sigma ligands than the corresponding piperazines. Structural modifications varying the optimal spatial distance between the piperidine nitrogen and ester functions led to the identification of the propyl compound 24 ([H-3]PENT K-i = 0.50 nM; [H-3]DTG K-i = 1.17 nM) and the butyl derivative 32 ([H-3]PENT K-i = 0.51 nM; [H-3]DTG K-i = 0.69 nM) as novel high-affinity sigma-selective agents. An ethylene spacer was optimum with para-substituted analogs. A notable finding was the discovery of 2-(4-phenylpiperidinyl) ethyl 1-(4-nitrophenyl)cyclopentanecarboxylate hydrochloride (15) (RLH-033), which demonstrated potent affinity for the [H-3]PENT-defined sigma site with a K-i of 50 pM, selectivity for sigma(1) over muscarinic M(1) (> 17600-fold), M(2) (> 34200-fold), dopamine D-1 (> 58000-fold), and D-2 (> 7000-fold) receptors, and inactivity at phencyclidine, NMDA, and opioid receptors. RLH-033 is a valuable tool which will aid further in understanding the biology of the sigma recognition site. Information from this research has further defined the topography of the sigma recognition site, which may provide an explanation for the diverse structures which bind with relatively high affinity.
1,4-Dihydropyridine derivatives of formula (I):
wherein Ar1 and Ar2 each represent an unsubstituted or substituted aromatic hydrocarbon or aromatic heterocyclic group; and R1 represents -C02R2, -SO2R3, -COR4, -CON(R5)2, -CN or -NO2 in which R2 is hydrogen, a straight chain, branched chain or cyclic saturated hydrocarbon group, which may have a substituent or a straight chain, branched chain or cyclic unsaturated hydrocarbon group having 2 to 10 carbon atoms, which may have a substituent, R3 is an alkyl group having 1 to 4 carbon atoms, R4 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; and R5 is an alkyl group having 1 to 4 carbon atoms.
1,4-Dihydropyridine derivatives and methods of producing the same
申请人:FUJIREBIO INC.
公开号:EP0488345A1
公开(公告)日:1992-06-03
1,4-dihydropyridine derivatives and optically active 1,4-dihydropyridine derivatives with the following formula, having vasodilating activity based on calcium antagonism, and PAF antaognism, and methods of producing the same are disclosed:
wherein (*) indicates a chiral center in the case of the optically active 1,4-dihydropyridine derivatives.