Synthesis and Pharmacological Characterization of Novel 6-Fluorochroman Derivatives as Potential 5-HT1A Receptor Antagonists
摘要:
A series of novel 6-fluorochroman derivatives was prepared and evaluated as antagonists for the 5-HT1A receptor. N-2- [[(6-Fluorochroman-8-yl)oxy]ethyl]-4-(4-methoxyphenyl)butylamine (3; J. Med. Chem. 1997, 40, 1252-1257) was chosen as a lead, and structural modifications were done on the aliphatic portion of the chroman ring, the tether linking the middle amine and the terminal aromatic ring, the aromatic ring, and lastly the amine. Radioligand binding assays proved that the majority of the novel compounds behaved as good to excellent ligands at the 5-HT1A receptor, some of which were selective with respect to alpha(1)-adrenergic and D-2-dopaminergic receptors. The antagonist activity of the compounds was assessed in the forskolin-stimulated adenylate cyclase assays in CHO cells expressing the human 5-HT1A receptors. Among the modifications attempted, introduction of an oxo or an optically active hydroxy moiety at the chroman C-4 position was effective in ameliorating the receptor selectivity. Six analogues were selected through the in vitro screeds and further evaluated for their in vivo activities. A 4-oxochroman derivative (31n), having a terminal 1,3-benzodioxole ring, demonstrated antagonist activities toward 8-OH-DPAT-induced behavioral and electrophysiological responses in rats.
Directed Nickel-Catalyzed Diastereoselective Reductive Difunctionalization of Alkenyl Amines
作者:Lei Zhao、Xiao Meng、Yifeng Zou、Junsong Zhao、Lili Wang、Lanlan Zhang、Chao Wang
DOI:10.1021/acs.orglett.1c03210
日期:2021.11.5
directing group screening to enable olefin difunctionalization with high levels of regio-, chemo-, and diastereocontrol. This general and practical protocol is compatible with α- or β-substituted terminal alkenes and internalalkenes, providing rapid access to branched aliphatic amines bearing two skipped and vicinal stereocenters with high diastereoselectivities that would otherwise be difficult to synthesize
Palladium-Catalyzed Direct Arylation of Allylamines with Simple Arenes
作者:Yichao Lei、Ruiying Qiu、Lingjuan Zhang、Conghui Xu、Yixiao Pan、Xubo Qin、Huanrong Li、Lijin Xu、Yuheng Deng
DOI:10.1002/cctc.201403019
日期:2015.4.20
The Pd(OAc)2‐catalyzed direct CH bond olefination of unreactive arenes with allylamines in the presence of AgOAc was developed. A variety of allylamines including β‐substituted substrates underwent smooth coupling reactions with various arenes to give exclusively the terminal arylation products in high yields with excellent regioselectivities and stereoselectivities. The reaction is compatible with
A convenient two-step procedure for the synthesis of primary (Z)-allyl amines, (Z)-homoallyl amines [(Z)-but-3-enylamines], and (Z)-pent-4-enylamines using the Wittig reaction was achieved. The use of nonstabilized ylides from triphenylphosphonium salt, potassium salt, and apolar solvent produced (Z/E)geometric isomer ratios generally greater than 1.6. The amine moiety was masked using a phtalimide group that was removed successfully in the last step of the process in two different conditions, NH2NH2/EtOH/rt or CH3NH2/EtOH/rt. However, in some cases, reduction of the C=C double bond in the deprotection with hydrazine was concomitantly observed.