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Bioorganic & medicinal chemistry letters

The first synthesis of [11C]J147, a new potential PET agent for imaging of Alzheimer's disease.


PMID 23237833

Abstract

J147 was synthesized from 2,4-dimethylphenylhydrazine hydrochloride and 3-methoxybenzaldehyde in 2 steps with 71% overall yield. The precursor desmethyl-J147 was synthesized from 3-hydroxybenzaldehyde and 2,4-dimethylphenylhydrazine hydrochloride in 4 steps with 63% overall yield. [(11)C]J147 was prepared from desmethyl-J147 with [(11)C]CH(3)OTf through O-[(11)C]methylation and isolated by HPLC combined with solid-phase extraction (SPE) in 35-50% radiochemical yield based on [(11)C]CO(2) and decay corrected to end of bombardment (EOB), with 370-740 GBq/μmol specific activity at EOB.

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462888
2,4-Dimethylphenylhydrazine hydrochloride, 97%
C8H12N2 · HCl