Ring-substituted histaprodifen analogues as partial agonists for histamine H1 receptors: synthesis and structure–activity relationships
摘要:
Thirteen racemic benzene ring-substituted analogues of histaprodifen (8a; 2-[2-(3,3-diphenylpropyl)-1H-imidazol-4-yl]ethanamine), a novel lead for potent and selective histamine H-1-receptor agonists, have been prepared from substituted 4,4-diphenylbutyronitriles 5 via cyclization of the corresponding methyl butyrimidates 6 with 2-oxo-4-phthalimido-1-butyl acetate in liquid ammonia, followed by deprotection. Nitriles 5 were accessible by alkylation of either substituted diphenylmethanes with 3-bromopropionitrile or diethyl malonate with substituted 1-chloro-diphenylmethanes and subsequent standard reactions. The title compounds 8 displayed partial agonism on contractile H-1 receptors of the guinea-pig ileum (E-max = 2-98% relative to histamine) and, compared with the endogenous agonist, were endowed with agonist potencies of 4-92%. The meta fluorinated (gc) and meta chlorinated (8f) analogues showed the highest relative potency in this series (95% confidence Limits 85-99% and 78-102%), but did not exceed the value of the lead 8a (99-124%). Compound 8c (2-[2-[3-(3-fluorophenyl)-3-phenylpropyl]-1H-imidazol-4-yl]ethanamine) was a partial agonist at contractile H-1 receptors of the guinea-pig aorta (relative potency 154% vs. 100% for histamine) and at relaxation-mediating endothelial H-1 receptors of the rat aorta (relative potency 556% vs. 100% for histamine) and matched with the functional behaviour of 8a. Agonism observed for each compound was sensitive to blockade by the selective H-1-receptor antagonist mepyramine (pA(2) approximate to 9 (guinea-pig) and pA(2) approximate to 8 (rat aorta)). All histaprodifen analogues 8 stimulated neither histaminergic H-2/H-3, nor cholinergic M-3 receptors. They displayed only low to moderate affinity for these sites (H-2: pD'(2), < 5; H-3/M-3: pA(2) < 6). With regard to the substitution pattern on the benzene ring, there was no correlation between the histaprodifen series and the corresponding derivatives of another selective H-1-receptor agonist, viz. 2-phenylhistamine. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
Pd(II)/Bipyridine-Catalyzed Conjugate Addition of Arylboronic Acids to α,β-Unsaturated Carboxylic Acids. Synthesis of β-Quaternary Carbons Substituted Carboxylic Acids
作者:Rui Liu、Zhenyu Yang、Yuxin Ni、Kaixuan Song、Kai Shen、Shaohui Lin、Qinmin Pan
DOI:10.1021/acs.joc.7b01248
日期:2017.8.4
Pd(II)/bipyridine-catalyzed conjugate addition of arylboronic acids to α,β-unsaturatedcarboxylicacids (including β,β-disubstituted acrylic acids) was developed and optimized, which provided a mild and convenient method for the highly challenging synthesis of β-quaternary carbons substituted carboxylicacids.
Boron/zinc exchange for the conjugate arylation of unsaturated Meldrum’s acid derivatives
作者:Micaela Jardim、Lucas L. Baldassari、Maria Eduarda Contreira、Angélica V. Moro、Diogo S. Lüdtke
DOI:10.1016/j.tet.2020.130967
日期:2020.12
approach for the conjugate arylation reaction of unsaturated Meldrum’s acid derivatives is reported. The reaction takes place through a Boron-Zinc exchange reaction between arylboronic acids and diethylzinc and the subsequent transfer of thus generated reactive aryl groups to the β-position of the double bond of the Meldrum’s derivatives. The compounds obtained are valuable synthetic intermediates and
Electrochemical oxidative decarboxylation and 1,2-aryl migration towards the synthesis of 1,2-diaryl ethers
作者:Faxiang Bu、Lijun Lu、Xia Hu、Shengchun Wang、Heng Zhang、Aiwen Lei
DOI:10.1039/d0sc03708g
日期:——
also radical precursors. Classic transition-metal-catalyzed and photochemical decarboxylation have shown their excellent site selectivity in radical chemistry. However, electrochemical decarboxylation with a long history hasn't got enough attention in recent years. In this work, the electrochemical oxidativedecarboxylation and 1,2-aryl migration of 3,3-diarylpropionic acids have been introduced to construct
Cationic Pd(II)/bipyridine-catalyzed conjugate addition of arylboronic acids to α,β-unsaturated carboxylic acids in aqueous media
作者:Yuxin Ni、Kaixuan Song、Kai Shen、Zhenyu Yang、Rui Liu、Shaohui Lin、Qinmin Pan
DOI:10.1016/j.tetlet.2018.02.013
日期:2018.3
An in-situ generated cationic Pd(II)/bipyridine-catalyzed conjugate addition of arylboronic acids to α,β-unsaturatedcarboxylicacids in water was developed and optimized. For most substrates, nearly quantitative yields were given, and the products can be purified by simple washing without column chromatography. The reaction can be scaled up to 1.0 g easily with excellent yields. Also the loading of
Covalent organic framework supported Pd(II)‐catalyzed conjugate additions of arylboronic acids to α,β‐unsaturated carboxylic acids
作者:Min Wen、Shujuan Lu、Chaogang Fan、Kai Shen、Shaohui Lin、Qinmin Pan
DOI:10.1002/aoc.6263
日期:2021.8
A palladium(II)-coordinated covalent organic framework (Pd(II)@COF) was mechanochemically synthesized from [2,2′-bipyridine]-5,5′-diamine (Bpy) and 1,3,5-triformylphloroglucinol (Tp), which was demonstrated as a catalyst for conjugate addition of arylboronic acids to unreactive α,β-unsaturatedcarboxylicacids in aqueous media (water/acetone = 1:1). Modest to good yields were obtained for most substrates