Heteroaromatic and Aniline Derivatives of Piperidines As Potent Ligands for Vesicular Acetylcholine Transporter
作者:Junfeng Li、Xiang Zhang、Zhanbin Zhang、Prashanth K. Padakanti、Hongjun Jin、Jinquan Cui、Aixiao Li、Dexing Zeng、Nigam P. Rath、Hubert Flores、Joel S. Perlmutter、Stanley M. Parsons、Zhude Tu
DOI:10.1021/jm400664x
日期:2013.8.8
To identify suitable lipophilic compounds having high potency and selectivity for vesicular acetylcholine transporter (VAChT), a heteroaromatic ring or a phenyl group was introduced into the carbonyl-containing scaffold for VAChT ligands. Twenty new compounds with ALogD values between 0.53 and 3.2 were synthesized, and their in vitro binding affinities were assayed. Six of them (19a, 19e, 19g, 19k, and 24a-b) displayed high affinity for VAChT (K-i = 0.93-18 nM for racemates) and moderate to high selectivity for VAChT over sigma(1) and sigma(2) receptors (K-i = 44-4400-fold). These compounds have a methyl or a fluoro substitution that provides the position for incorporating PET radioisotopes C-11 or F-18. Compound (-)-[C-11]24b (K-i = 0.78 nM for VAChT, 1200-fold over sigma receptors) was successfully synthesized and evaluated in vivo in rats and nonhuman primates. The data revealed that (-)-[C-11]24b has highest binding in striatum and has favorable pharmacokinetics in the brain.