Neuroleptic activity of chiral trans-hexahydro-.gamma.-carbolines
摘要:
A series of trans-8-fluoro-5-(4-fluorophenyl)-2,3,4,4a,5, 9b-hexahydro-1H-pyrido[4,3-b]indoles with various N-2 substituents has been prepared and tested for neuroleptic activity [( 3H]spiroperidol binding and amphetamine antagonism). Several members of this series showed exceptional in vivo potency, especially the hydantoin derivatives 27-30. Resolution into the enantiomers showed that neuroleptic activity is associated with the 4aS,9bS absolute configuration. These rigid neuroleptics have been correlated with other rigid neuroleptics [(+)-dexclamol, Ro 22-1319] and can serve to further define the topography of the dopamine receptor.
Bis-[4-(R-amino)-1-pyridinium]alkanes are prepared by reacting a 4-(R-amino)pyridine with an appropriate disubstituted alkane. The compounds are useful as antimicrobial agents. Certain species are also useful as dental plaque-preventive agents.
New Stable Cu(I) Catalyst Supported on Weakly Acidic Polyacrylate Resin for Green C-N Coupling: Synthesis of N-(Pyridin-4-yl)benzene Amines and N,N-Bis(pyridine-4-yl)benzene Amines
作者:Nitin Kore、Pavel Pazdera
DOI:10.3390/molecules22010002
日期:——
A method for preparation of a new stable Cu(I) catalyst supported on weakly acidic polyacrylate resin without additional stabilizing ligands is described. A simple and efficient methodology for Ullmann Cu(I) catalyzed C-N cross coupling reactions using this original catalyst is reported. Coupling reactions of 4-chloropyridinium chloride with anilines containing electron donating (EDG) or electron withdrawing
描述了一种在没有额外稳定配体的情况下制备负载在弱酸性聚丙烯酸酯树脂上的新型稳定 Cu (I) 催化剂的方法。报道了使用这种原始催化剂的 Ullmann Cu (I) 催化 CN 交叉偶联反应的简单有效方法。4-氯吡啶鎓与分别含有给电子 (EDG) 或吸电子 (EWG) 基团、萘-2-胺和哌嗪的苯胺的偶联反应得到了成功证明。
Iodine-mediated oxidative N–N coupling of secondary amines to hydrazines
An I2-mediated N–Ncoupling reaction has been established for oxidative dimerization of N-aryl aminopyridines to a variety of novel hydrazine derivatives under mild conditions. This synthetic method does not require use of transition metals and can be conveniently carried out on a gram scale. It is also applicable to diphenylamine and N-alkyl aniline substrates.
Direct activation of amine N−H bonds is realized to provide N-radicals in a redox-neutral and site-selective manner. Under visible-light irradiation of quantum dots, the N-radicals are successfully applied to the synthesis of aromatic amines. The high efficiency and broad functional-group tolerance demonstrate the potential of photocatalytic N-radicals in the construction of valuable arylamines.
Chain Transfer Kinetics of Acid/Base Switchable <i>N</i>-Aryl-<i>N</i>-Pyridyl Dithiocarbamate RAFT Agents in Methyl Acrylate, <i>N</i>-Vinylcarbazole and Vinyl Acetate Polymerization
作者:Daniel J. Keddie、Carlos Guerrero-Sanchez、Graeme Moad、Roger J. Mulder、Ezio Rizzardo、San H. Thang
DOI:10.1021/ma300616g
日期:2012.5.22
The structures of the "Z" and "R" substituents of a RAFT agent (Z-C(S)S R) determine a RAFT agent's ability to control radical polymerization. In this paper we report new acid/base switchable N-aryl-N-pyridyl dithiocarbamates (R = -CH2CN, Z = -N(Py)(Ar)) which vary in substituent at the 4-position of the aryl ring and the use of these to control molecular weight and dispersity. In their protonated form, the new RAFT agents are more effective in controlling polymerization of the more activated monomer, methyl acrylate (MA), whereas in their neutral form they provide more effective control of the polymerization of less activated monomers, N-vinyl carbazole (NVC) and vinyl acetate (VAc). For each polymerization, the apparent chain transfer coefficient (C-tr(aPP)) shows a good correlation with Hammett parameters. Dithiocarbamates with more electron-withdrawing aryl ring substituents have the higher C-tr(aPP). This demonstrates the influence of polar effects on C-tr(aPP) and supports the hypothesis that the activity of these RAFT agents is determined by the availability of the lone pair of the dithiocarbamate nitrogen.