Radiosynthesis of the diastereomerically pure (E)-[11C]ABP688

We report an efficient protocol for the radiosynthesis of diastereomerically pure (E)-[C-11]ABP688, a positron emission tomography (PET) tracer for metabotropic glutamate type 5 (mGlu5) receptor imaging. The protocol reliably provides sterile and pyrogen-free formulation of (E)-[C-11]ABP688 suitable for preclinical and clinical PET imaging with >99% diastereomeric excess (d.e.), >99% overall radiochemical purity (RCP), 14.9 +/- 4.3% decay-corrected radiochemical yield (RCY), and 148.86 +/- 79.8 GBq/mu mol molar activity in 40 minutes from the end of bombardment.