Synthesis and Preliminary PET Imaging Studies of a FAAH Radiotracer ([11C]MPPO) Based on α-Ketoheterocyclic Scaffold
摘要:
Fatty acid amide hydrolase (FAAH) is one of the principle enzymes for metabolizing endogenous cannabinoid neurotransmitters such as anandamide, and thus regulates endocannabinoid (eCB) signaling. Selective pharmacological blockade of FAAH has emerged as a potential therapy to discern the endogenous functions of anandamide-mediated eCB pathways in anxiety, pain, and addiction. Quantification of FAAH in the living brain by positron emission tomography (PET) would help our understanding of the endocannabinoid system in these conditions. While most FAAH radiotracers operate by an irreversible ("suicide") binding mechanism, a FAAH tracer with reversibility would facilitate quantitative analysis. We have identified and radiolabeled a reversible FAAH inhibitor, 7-(2-[C-11]methoxyphenyl)-1- (5-(pyridin-2-yl)oxazol-2-yl)heptan-1-one ([C-11]MPPO) in 13% radiochemical yield (nondecay corrected) with >99% radiochemical purity and 2 Ci/mu mol (74 GBq/mu mol) specific activity. The tracer showed moderate brain uptake (0.8 SUV) with heterogeneous brain distribution. However, blocking studies with a potent FAAH inhibitor URB597 demonstrated a low to modest specificity to the target. Measurement of lipophilicity, metabolite, and efflux pathway analysis were also performed to study the pharmacokinetic profile of [C-11]MPPO. In all, we reported an efficient radiolabeling and preliminary evaluation of the first-in-class FAAH inhibitor [C-11]MPPO with alpha-ketoheterocyclic scaffold.
An easy access to symmetrical Z-olefins from phosphorus ylides
作者:S. Poulain、N. Noiret、H. Patin
DOI:10.1016/0040-4039(96)01737-6
日期:1996.10
Symmetrical Z-olefins are obtained in good to quantitative yields from phosphonium salts via an autoxidation process, in salt-free conditions.
在无盐条件下,通过自氧化过程,可以从phospho盐以良好的定量收率获得对称的Z-烯烃。
Synthetic Approaches to Novel Archaeal Tetraether Glycolipid Analogues
作者:Grégory Lecollinet、Rachel Auzély-Velty、Mathieu Danel、Thierry Benvegnu、Grahame Mackenzie、John W. Goodby、Daniel Plusquellec
DOI:10.1021/jo9822028
日期:1999.4.1
Symmetrical and unsymmetrical archaeal tetraether glycolipid analogues have been prepared. The syntheses are based upon the elaboration of lipid cores from versatile chiral starting materials followed by simultaneous or sequential introduction of polar headgroups. Three pathways (A-C) were elaborated for the synthesis of stereochemically defined lipids 14-16 characterized by a straight bridging spacer
Pheromone, XXXII. Bausteine zur Darstellung zweifach ungesättigter Schmetterlings-pheromone
作者:Hans Jürgen Bestmann、Karl Heinrich Koschatzky、Wilfried Schätzke、Joachim Süß、Otto Vostrowsky
DOI:10.1002/jlac.198119810920
日期:1981.9.21
Die Darstellung α,ω-bifunktioneller Ausgangsverbindungen sowie (Z)- und (E)-konfigurierter, ungesättigter Synthesebausteine, die man mittels Wittig-Reaktion, Michael-Addition, Acetylen-synthese oder Crombie-Reaktion erhält, wird beschrieben. Diese Verbindungen werden im Rahmen eines „Baukastensystems” zur Synthese bisolefinischer Sexualpheromone benötigt.