Synthesis and pharmacological characterization of new silicon-based W84-type allosteric modulators for ligand binding to muscarinic M2 receptors
摘要:
The silicon-based allosteric modulators of ligand binding to muscarinic acetylcholine receptors [R-1-(CH2)(3)-SiMe2-(CH2)(5)- NMe2-(CH2)(3)-R-1]Br (3), [R-2-(CH2)(3)-SiMe2 (CH2)(5)-NMe2-(CH2)(3)-R-2]Br (4), [R-1-(CH2)(3)-SiMe2-(CH2)(3)-NMe2-(CH2)(3)- R-2]Br (5), and [R-2-(CH2)(3)-SiMe2- (CH2)(5)-NMe2-(CH2)(3)-R-1]Br (6) (R-1 = phthalimido; R-2 = 1,8-naphthalimido) were sythesized, starting from chlorodimethylsilane. Compounds 3-6 were studied for their allosteric interaction at porcine heart muscarinic M-2 receptors. They inhibited the dissociation of the orthosteric ligand [H-3]N-methylscopolamine ([H-3]NMS) with similar potency; compounds 4 and 6 yielded steep concentration-effect curves. All compounds enhanced [H-3]NMS equilibrium binding, but with different efficacies. The effect of 4 on [H-3]NMS binding was studied at cloned M-1-M-5 receptor subtypes. Compound 4 did not affect [H-3]NMS equilibrium binding at M-1, M-3, M-4, and M-5 receptors, thus representing an M-2-selective allosteric enhancer of [H-3]NMS binding. (C) 2003 Elsevier B.V. All rights reserved.
Synthesis and pharmacological characterization of new silicon-based W84-type allosteric modulators for ligand binding to muscarinic M2 receptors
摘要:
The silicon-based allosteric modulators of ligand binding to muscarinic acetylcholine receptors [R-1-(CH2)(3)-SiMe2-(CH2)(5)- NMe2-(CH2)(3)-R-1]Br (3), [R-2-(CH2)(3)-SiMe2 (CH2)(5)-NMe2-(CH2)(3)-R-2]Br (4), [R-1-(CH2)(3)-SiMe2-(CH2)(3)-NMe2-(CH2)(3)- R-2]Br (5), and [R-2-(CH2)(3)-SiMe2- (CH2)(5)-NMe2-(CH2)(3)-R-1]Br (6) (R-1 = phthalimido; R-2 = 1,8-naphthalimido) were sythesized, starting from chlorodimethylsilane. Compounds 3-6 were studied for their allosteric interaction at porcine heart muscarinic M-2 receptors. They inhibited the dissociation of the orthosteric ligand [H-3]N-methylscopolamine ([H-3]NMS) with similar potency; compounds 4 and 6 yielded steep concentration-effect curves. All compounds enhanced [H-3]NMS equilibrium binding, but with different efficacies. The effect of 4 on [H-3]NMS binding was studied at cloned M-1-M-5 receptor subtypes. Compound 4 did not affect [H-3]NMS equilibrium binding at M-1, M-3, M-4, and M-5 receptors, thus representing an M-2-selective allosteric enhancer of [H-3]NMS binding. (C) 2003 Elsevier B.V. All rights reserved.
RnSiCl4−n(n = 0, 2) was shown to afford heterocyclic silicon compounds in good yield (up to 91%). In contrast to non-electrochemical methods of synthesis of silacycloalkanes, based on the ring closure of terminal unsaturated compounds, the electrochemical route does not produce α-methylated byproducts and the heterocycle formation occurs quite selectively. The yield of cyclic organosilicon compounds goes
在式R n SiCl 4- n(n的多氯硅烷存在下,脂肪族α,ω-二溴化物的电化学还原= 0,2)被证明可以提供高收率的杂环硅化合物(高达91%)。与合成非硅烷基环烷烃的非电化学方法相反,基于末端不饱和化合物的闭环,电化学途径不会产生α-甲基化副产物,并且杂环的形成非常有选择性。环状有机硅化合物的收率在1,1,1-二甲基-1-硅环戊烷(91%)处达到最大值,而在1,1-二甲基-1-硅环丁烷(18%)和1,1-二甲基-1-苯环己烷中的产率下降硅环庚烷(57%)。尽管存在许多可能的反应路径,并且由于硅的高官能度而形成聚合物的可能性很高,但通过电化学过程形成5-silaspiro [4,4]壬烷的反应具有很高的选择性。电化学闭环的较高选择性被认为是由于在单甲硅烷基化中间体中CHal键不可逆还原过程中电极的定向作用所致。讨论了该过程的可能机制。