Synthesis and Molecular Modeling of 1-Phenyl-1,2,3,4-tetrahydroisoquinolines and Related 5,6,8,9-Tetrahydro-13bH-dibenzo[a,h]quinolizines as D1 Dopamine Antagonists
摘要:
New 1-phenyl-1,2,3,4-tetrahydroisoquinolines and related 5,6,8,9-tetrahydro-13bH-dibenzo[a,h]-quinolizines were prepared as ring-contracted analogs of the prototypical 1-phenyl-2,3,4,5-tetrahydrobenzazepines (e.g., SCH23390) as a continuation of our studies to characterize the antagonist binding pharmacophore of the D-1 dopamine receptor. Receptor affinity was assessed by competition for [H-3]SCH23390 binding sites in rat striatal membranes. The 6-bromo-1-phenyltetrahydroisoquinoline analog 2 of SCH23390 1 had D-1 binding affinity similar to that for the previously reported 6-chloro analog 6, whereas the 6,7-dihydroxy analog 5 had significantly lower D-1 affinity. Conversely, neither 6-monohydroxy- (3) nor 7-monohydroxy-1-phenyltetrahydroisoquinolines (4) had significant affinity for the D-1 receptor. These results demonstrate that 6-halo and 7-hydroxy substituents influence D-1 binding affinity of the 1-phenyltetrahydroisoquinolines in a fashion similar to their effects on 1-phenyltetrahydrobenzazepines. azepines. The conformationally constrained 3-chloro-2-hydroxytetrahydrodibenzoquinolizine 9 had much lower affinity relative to the corresponding, and more flexible, 6-chloro-7-hydroxy-1-phenyltetrahydroisoquinoline 6. Similarly, 2,3-dihydroxytetrahydrodibenzoquinolizine 10 had much lower D-1 affinity compared to dihydrexidine 14, a structurally similar hexahydrobenzo[a]phenanthridine that is a high-affinity full D-1 agonist. Together, these data not only confirm the effects of the halo and hydroxy substitutents on the parent nucleus but demonstrate the pharmacophoric importance of both the nitrogen position and the orientation of the accessory phenyl ring in modulating D-1 receptor affinity and function. Molecular modeling studies and conformational analyses were conducted using the data from these new analogs in combination with the data from compounds previously synthesized. The resulting geometries were used to refine a working model of the D-1 antagonist pharmacophore using conventional quantitative structure-activity relationships and three-dimensional QSAR (CoMFA).
Cyclisierungen von N-(2-Phenylethyl)-2-(2-hydroxyethyl)-benzamiden
作者:Hans-Jürgen Mika、Werner Meise
DOI:10.1002/ardp.19853180212
日期:——
Die Cyclisierung der Hydroxyamide 3 unter Bischler‐Napieralski‐Bedingungen erfolgt in Abhängigkeit vonder Substitution der Aromaten auf drei verschiedene Reaktionsweisen: Während die im Phenylethylamin‐Teil (Ring A) nicht aktivierten Amide 3c und 3d nur den Ring C schließen, entsteht bei dem in A aktivierten, jedoch in Ring D (Lacton‐Teil) für einen nucleophilen Angriff desaktivierten Amid 3b anschließend
羟基酰胺 3 在 Bischler-Napieralski 条件下的环化以三种不同的方式发生,具体取决于芳族化合物的取代:而在苯乙胺部分(环 A)中未活化的酰胺 3c 和 3d 仅闭合环 C,在 A 中激活,但在环 D(内酯部分)中酰胺 3b 因亲核攻击而失活,然后是环 B;相反,在仅在 A 中激活的 3a 中,首先发生 Bischler-Napieralski 反应(环 B),然后发生分子内 N-烷基化(环 C)。
Dopamine/Serotonin Receptor Ligands. 10: SAR Studies on Azecine-type Dopamine Receptor Ligands by Functional Screening at Human Cloned D<sub>1</sub>, D<sub>2L</sub>, and D<sub>5</sub> Receptors with a Microplate Reader Based Calcium Assay Lead to a Novel Potent D<sub>1</sub>/D<sub>5</sub> Selective Antagonist
作者:Barbara Hoefgen、Michael Decker、Patrick Mohr、Astrid M. Schramm、Sherif A. F. Rostom、Hussein El-Subbagh、Peter M. Schweikert、Dirk R. Rudolf、Matthias U. Kassack、Jochen Lehmann
DOI:10.1021/jm050846j
日期:2006.1.1
On the basis of the benz[d]indolo[2,3-g]azecine derivative I (LE300), structure-activity relations were investigated in order to identify the pharmacophore in this new class of ligands. Various structural modifications were performed and the inhibitory activities at human cloned D-1, D-2L, and D-5 receptors were measured by using a simple fluorescence microplate reader based calcium assay. Subsequently, the affinities of active compounds were estimated by radioligand binding experiments. Deleting one of the aromatic rings as well as replacing it by a phenyl moiety abolishes the inhibitory activities almost completely. Contraction of the 10-membered central ring decreases them significantly. The replacement of indole by thiophene or N-methylpyrrole reduces the inhibitory activity, whereas replacing the indole by benzene increases it. Finally, the hydroxylated dibenz[d,g]azecine derivative 11d (LE404) was found to be more active than the lead I in the functional calcium assay as well as in radioligand displacement experiments.
Vlaeminck, F.; Cock, E. De; Tourwe, D., Heterocycles, 1981, vol. 15, # 2, p. 1213 - 1218
作者:Vlaeminck, F.、Cock, E. De、Tourwe, D.、Binst, G. Van
DOI:——
日期:——
VLAEMINCK F.; COCK E. DE; TOURWE D.; BINST G. VAN, HETEROCYCLES, 1981, 15, NO 2, SPEC. ISSUE, 1213-1218
作者:VLAEMINCK F.、 COCK E. DE、 TOURWE D.、 BINST G. VAN
DOI:——
日期:——
MIKA, H. -J.;MEISE, W., ARCH. PHARM., 1985, 318, N 2, 168-174