Radical fluoroarylation in radiochemical synthesis
作者:Christina Hultsch、Olga Blank、Hans-Jürgen Wester、Markus R. Heinrich
DOI:10.1016/j.tetlet.2007.12.128
日期:2008.3
In this study, we report on the radical [F-18]fluoroarylation of different olefins using 4-[F-18]fluorobenzenediazonium ions to provide a new route to radiopharmaceuticals containing a deactivated, 4-[F-18]fluoro substituted phenyl group. This new methodology was shown to be well suited for the synthesis of F-18-labelled stilbenes. Stilbene 7 is now accessible within 80 min in 30-45% overall radiochemical yield starting from [F-18]fluoride. (C) 2008 Elsevier Ltd. All rights reserved.
Syntheses of 3-carbomethoxy-4-(aryl)piperidines and In vitro and In vivo pharmacological evaluation: identification of inhibitors of the human dopamine transporter
作者:Xianqi Feng、Keith Fandrick、Robert Johnson、Aaron Janowsky、John R Cashman
DOI:10.1016/s0968-0896(02)00528-x
日期:2003.3
A series of 3-carbomethoxy-4-(aryl-substituted)piperidines with various aryl groups were synthesized and examined for binding and reuptake inhibition at the human dopamine transporter, the human serotonin transporter, and the human norepinephrine transporter. The binding potency and reuptake inhibition efficacy was compared with that of (-)-cocaine to determine the significance of removing the two-carbon bridge of the cocaine nucleus on the inhibition of transporter binding and reuptake. Of the transporters examined, the substituted piperidines were relatively selective for the human dopamine transporter. In all cases examined, the cis-diastereomer of the 3-carbomethoxy-4-(aryl-substituted)piperidine was observed to be a more potent inhibitor of the human dopamine transporter than the trans diastereomer. Based on the K-i (binding) and IC50 (reuptake inhibition) values obtained, the most potent inhibitor of the series was cis-3-carbomethoxy-4-(4'-chlorophenyl)piperidine,and this compound suppressed spontaneous- and cocaine-induced stimulation in non-habituated male Swiss-Webster mice. The conclusion is that substantial portions of the cocaine structure can be dissected away to provide compounds with significant binding and reuptake inhibition of the human dopamine transporter. (C) 2002 Elsevier Science Ltd. All rights reserved.
Chemical process
申请人:Beecham Group PLC.
公开号:US04861893A1
公开(公告)日:1989-08-29
A process is disclosed for the preparation of a compound of formula (I): ##STR1## where Ar is aryl or substituted aryl and R.sup.3 and R.sup.4 are the same or different and each is alkyl, which process comprises hydrognating a compound of formula (II): ##STR2## wherein Ar, R.sup.3 and R.sup.4 are as defined with respect to formula (I) and Hal is a halogen atom. Compounds of formula (I) are useful as chemical intermediates.