Electric Literature of C6H11NO2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Piperidine-3-carboxylic acid, is researched, Molecular C6H11NO2, CAS is 498-95-3, about Synthesis and Initial Characterization of a Reversible, Selective 18F-Labeled Radiotracer for Human Butyrylcholinesterase. Author is Gentzsch, Christian; Chen, Xinyu; Spatz, Philipp; Kosak, Urban; Knez, Damijan; Nose, Naoko; Gobec, Stanislav; Higuchi, Takahiro; Decker, Michael.
A neuropathol. hallmark of Alzheimer′s disease (AD) is the presence of amyloid-β (Aβ) plaques in the brain, which are observed in a significant number of cognitively normal, older adults as well. In AD, butyrylcholinesterase (BChE) becomes associated with Aβ aggregates, making it a promising target for imaging probes to support diagnosis of AD. In this study, we present the synthesis, radiochem., in vitro and preliminary ex and in vivo investigations of a selective, reversible BChE inhibitor as PET-tracer for evaluation as an AD diagnostic. Radiolabeling of the inhibitor was achieved by fluorination of a resp. tosylated precursor using K[18F]. IC50 values of the fluorinated compound were obtained in a colorimetric assay using recombinant, human (h) BChE. Dissociation constants were determined by measuring hBChE activity in the presence of different concentrations of inhibitor. Radiofluorination of the tosylate precursor gave the desired radiotracer in an average radiochem. yield of 20 ± 3 %. Identity and > 95.5 % radiochem. purity were confirmed by HPLC and TLC autoradiog. The inhibitory potency determined in Ellman′s assay gave an IC50 value of 118.3 ± 19.6 nM. Dissociation constants measured in kinetic experiments revealed lower affinity of the inhibitor for binding to the acylated enzyme (K2 = 68.0 nM) in comparison to the free enzyme (K1 = 32.9 nM). The reversibly acting, selective radiotracer is synthetically easily accessible and retains promising activity and binding potential on hBChE. Radiosynthesis with 18F labeling of tosylates was feasible in a reasonable time frame and good radiochem. yield.
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