8,9-Dihydroxy-2,3,7,11b-tetrahydro-1H-naph[1,2,3-de]isoquinoline: A Potent Full Dopamine D1 Agonist Containing a Rigid β-Phenyldopamine Pharmacophore
摘要:
The present work reports the synthesis and preliminary pharmacological characterization of 8,9-dihydroxy-2,3,7,11b-tetrahydro-1H-naph[1,2,3-de]isoquinoline (4, dinapsoline). This molecule was designed to conserve the essential elements contained in our D-1 agonist pharmacophore model (i.e., position and orientation of the nitrogen, hydroxyls, and phenyl rings). It involved taking the backbone of dihydrexidine [3; (+/-)-trans-10,11-dihydroxy-5,6,6a,7,8,12b-hexahydrobenzo[alpha]phenanthridine], the first high-affinity full D-1 agonist, and tethering the two phenyl rings of dihydrexidine through a methylene bridge and removing the C(7)-C(8) ethano bridge. Preliminary molecular modeling studies demonstrated that these modifications conserved the essential elements of the hypothesized pharmacopore. Dinapsoline 4 had almost identical affinity (K-I = 5.9 nM) to 3 at rat striatal D-1 receptors and had a shallow competition curve (n(H) = 0.66) that suggested agonist properties. Consistent with this, in both rat striatum and C-6-mD(1) cells, dinapsoline 4 was a full agonist with an EC(50) Of Ca 30 nM in stimulating synthesis of cAMP via D-1 receptors. The design and synthesis of dinapsoline 4 provide a powerful test of the model of the D-1 pharmacophore we have developed and provide another chemical series that can be useful probes for the study of D-1 receptors. An interesting property of 3 is that it also has relatively high D-2 affinity (K-0.5 = 50 nM) despite having an accessory phenyl ring usually thought to convey D-1 selectivity. Dinapsoline 4 was found to have even higher affinity for the D-2 receptor (K-0.5 = 31 nM) than 3. Because of the high affinity of 4 for D-2 receptors, it and its analogs can be powerful tools for exploring the mechanisms of ''functional selectivity'' (i.e., that 3 is an agonist at some D-2 receptors, but an antagonist at others). Together, these data suggest that 4 and its derivatives may be powerful tools in the study of dopamine receptor function and also have potential clinical utility in Parkinson's disease and other conditions where perturbation of dopamine receptors is useful.
Co-administration of dopamine-receptor binding compounds
申请人:Fernandes B. Prabhavathi
公开号:US20070155720A1
公开(公告)日:2007-07-05
Methods for treating a patient having neurological, psychotic, and psychiatric disorders are described comprising the steps of administering to the patient an effective amount of a partial and/or full dopamine D
1
receptor agonist, and administering to the patient an effective amount of a dopamine D
2
receptor antagonist. Pharmaceutical compositions comprising a dopamine D
1
receptor agonist and a dopamine D
2
receptor antagonist are also described. The D
1
dopamine receptor agonist and the D
2
dopamine receptor antagonist can be administered to the patient in the same or in a different composition or compositions.
Method of Administration of Dopamine Receptor Agonists
申请人:Fernandes B. Prabhavathi
公开号:US20070254906A1
公开(公告)日:2007-11-01
Methods for treating a patient having pulmonary edema are described. The methods include administering to the lung endobronchial space of the airways of the patient an effective amount of a dopamine D
1
receptor agonist. Dopamine D
1
receptor agonists, including hexahydrobenzophenanthridine, hexahydrothienophenanthridine, phenyltetrahydrobenzazepine, chromenoisoquinoline, naphthoisoquinoline dopamine receptor agonists, and their pharmaceutically acceptable salts, formulated as aerosols and dry powders are also described.
Co-Administration of Dopamine-Receptor Binding Compounds
申请人:Fernandes Prabhavathi B.
公开号:US20100041690A1
公开(公告)日:2010-02-18
Methods for treating a patient having neurological, psychotic, and psychiatric disorders are described comprising the steps of administering to the patient an effective amount of a partial and/or full dopamine D
1
receptor agonist, and administering to the patient an effective amount of a dopamine D
2
receptor antagonist, Pharmaceutical compositions comprising a dopamine D
1
receptor agonist and a dopamine D
2
receptor antagonist are also described. The D
1
dopamine receptor agonist and the D
2
dopamine receptor antagonist can be administered to the patient in the same or in a different composition or compositions.