Phase I metabolites of mephedrone display biological activity as substrates at monoamine transporters
摘要:
Background and Purpose4‐Methyl‐N‐methylcathinone (mephedrone) is a synthetic stimulant that acts as a substrate‐type releaser at transporters for dopamine (DAT), noradrenaline (NET) and 5‐HT (SERT). Upon systemic administration, mephedrone is metabolized to several phase I compounds: the N‐demethylated metabolite, 4‐methylcathinone (nor‐mephedrone); the ring‐hydroxylated metabolite, 4‐hydroxytolylmephedrone (4‐OH‐mephedrone); and the reduced keto‐metabolite, dihydromephedrone.Experimental ApproachWe used in vitro assays to compare the effects of mephedrone and synthetically prepared metabolites on transporter‐mediated uptake and release in HEK293 cells expressing human monoamine transporters and in rat brain synaptosomes. In vivo microdialysis was employed to examine the effects of i.v. metabolite injection (1 and 3 mg·kg−1) on extracellular dopamine and 5‐HT levels in rat nucleus accumbens.Key ResultsIn cells expressing transporters, mephedrone and its metabolites inhibited uptake, although dihydromephedrone was weak overall. In cells and synaptosomes, nor‐mephedrone and 4‐OH‐mephedrone served as transportable substrates, inducing release via monoamine transporters. When administered to rats, mephedrone and nor‐mephedrone produced elevations in extracellular dopamine and 5‐HT, whereas 4‐OH‐mephedrone did not. Mephedrone and nor‐mephedrone, but not 4‐OH‐mephedrone, induced locomotor activity.Conclusions and ImplicationsOur results demonstrate that phase I metabolites of mephedrone are transporter substrates (i.e. releasers) at DAT, NET and SERT, but dihydromephedrone is weak in this regard. When administered in vivo, nor‐mephedrone increases extracellular dopamine and 5‐HT in the brain whereas 4‐OH‐mephedrone does not, suggesting the latter metabolite does not penetrate the blood–brain barrier. Future studies should examine the pharmacokinetics of nor‐mephedrone to determine its possible contribution to the in vivo effects produced by mephedrone.
Synthesis and reactivity of α-sulfenyl-β-chloroenones, including oxidation and Stille cross-coupling to form chalcone derivatives
作者:Aoife M. Kearney、Linda Murphy、Chloe C. Murphy、Kevin S. Eccles、Simon E. Lawrence、Stuart G. Collins、Anita R. Maguire
DOI:10.1016/j.tet.2021.132091
日期:2021.5
The synthesis of a range of novel α-sulfenyl-β-chloroenones from the corresponding α-sulfenylketones, via a NCS mediated chlorination cascade, is described. The scope of the reaction has been investigated and compounds bearing alkyl- and arylthio substituents have been synthesised. In most instances, the Z α-sulfenyl-β-chloroenones were formed as the major products, while variation of the substituent
One-Pot Synthesis of α-Chloro Ketones from Secondary Alcohols Using<i>N</i>,<i>N</i>-Dichloro-<i>p</i>-toluenesulfonamide
作者:Yong Hae Kim、In Sang Lee、Sang Chul Lim
DOI:10.1246/cl.1990.1125
日期:1990.7
Various alkyl aryl secondary alcohols reacted with N,N-dichloro-p-toluenesulfonamide (N,N-dichloramine-T) in CH3CN at 35 °C to give the corresponding α-chloro ketones in excellent yields under mild and neutral conditions.
A new domino reaction has been developed that allows the combination of styrenes and α‐alkyl ketone radicals to afford a wide array of polysubstituted furans in good to excellent yields under mild and simple reaction conditions. The key to success of this novel protocol is the use of photocatalyst fac‐Ir(ppy)3 and oxidant K2S2O8. Mechanistic studies by a radical scavenger and photoluminescence quenching
已开发出一种新的多米诺反应,该反应允许苯乙烯和α-烷基酮自由基的组合在温和简单的反应条件下以良好或优异的收率提供各种各样的多取代呋喃。该新协议成功的关键是使用光催化剂fac ‐Ir(ppy)3和氧化剂K 2 S 2 O 8。通过自由基清除剂和光致发光猝灭的机理研究表明,自由基加成/氧化途径是可行的。
Efficient α‐Chlorination of Aryl Ketones Using Aluminum Chloride/Urea–Hydrogen Peroxide in Ionic Liquid
作者:Jong Chan Lee、Hyun Jung Park
DOI:10.1080/00397910500449641
日期:2006.4.1
Abstract Effective α‐chlorination reactions of arylketones into the corresponding α‐chloroketones have been accomplished with aluminumchloride hexahydrate and urea–hydrogen peroxide in [bmim]BF4 ionic liquid.
Iodine(III)-Mediated Oxidative Hydrolysis of Haloalkenes: Access to α-Halo Ketones by a Release-and-Catch Mechanism
作者:Antoine Jobin-Des Lauriers、Claude Y. Legault
DOI:10.1021/acs.orglett.5b03345
日期:2016.1.4
An unprecedented iodine(III)-mediated oxidative transposition of vinyl halides has been accomplished. The products obtained, α-halo ketones, are useful and polyvalent synthetic precursors. There are only a handful of reported examples of the direct conversion of vinyl halides to their corresponding α-halo carbonyl compounds. Insights into the mechanism and demonstration that this synthetic transformation