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Stereoselective synthesis of (2S,3R)- and (2R,3S)-iodoreboxetine; potential SPECT imaging agents for the noradrenaline transporter†
Nicola K. Jobson,Rosemary Spike,Andrew R. Crawford,Deborah Dewar,Sally L. Pimlott,Andrew Sutherland
Organic & Biomolecular Chemistry Pub Date : 04/30/2008 00:00:00 , DOI:10.1039/B802819B
Abstract

With the aim of developing a new SPECT imaging agent for the noradrenaline transporter, a twelve-step stereoselective synthesis of iodinated analogues of (2S,3R)- and (2R,3S)-reboxetine has been achieved from 4-bromobenzaldehyde. The key steps involve a Sharpless asymmetric epoxidation to establish the stereogenic centres and a copper catalysed aromatic halogen exchange reaction to introduce the key iodine atom. In vitro testing of these compounds using a [3H]nisoxetine displacement assay with homogenised rat brain shows both compounds to have significant affinity, with Ki values of 320.8 nM and 58.2 nM for (2S,3R)- and (2R,3S)-iodoreboxetine respectively.

Graphical abstract: Stereoselective synthesis of (2S,3R)- and (2R,3S)-iodoreboxetine; potential SPECT imaging agents for the noradrenaline transporter
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