Synthesis of a PET tau tracer [(11)C]PBB3 for imaging of Alzheimer's disease

Bioorganic & Medicinal Chemistry Letters
Min WangQi-Huang Zheng

Abstract

The authentic standard PBB3 and its precursor N-desmethyl-PBB3 as well as TBS-protected N-desmethyl-PBB3 precursor for radiolabeling were synthesized from 5-bromo-2-nitropyridine, acrolein diethyl acetal, 6-methoxy-2-methylbenzothiazole, and diethylchlorophosphate with overall chemical yield 1% in six steps, 2% in five steps, and 1% in six steps, respectively. [(11)C]PBB3 was prepared from either desmethyl-PBB3 or TBS-protected desmethyl-PBB3 with [(11)C]CH3OTf through N-[(11)C]methylation and isolated by HPLC combined with SPE in 20-25% and 15-20% radiochemical yield, respectively, based on [(11)C]CO2 and decay corrected to end of bombardment (EOB). The radiochemical purity was >99%, and the specific activity at EOB was 370-1110 GBq/μmol with a total synthesis time of ~40-min from EOB.

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Citations

Jan 21, 2017·Journal of Medicinal Chemistry·Frederik J R RomboutsDieder Moechars
Mar 2, 2018·Expert Opinion on Drug Discovery·Khalid IqbalCheng-Xin Gong
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Jun 4, 2018·Bioorganic & Medicinal Chemistry Letters·Mingzhang GaoQi-Huang Zheng

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