A new multi-gram synthetic route to labeling precursors for the D2/3 PET agent 18F-fallypride
作者:Kwangho Kim、Nicole R. Miller、Gary A. Sulikowski、Craig W. Lindsley
DOI:10.1016/j.bmcl.2008.07.065
日期:2008.8
This Letter describes a new multi-gram synthetic protocol for the preparation of the classic tosylate labeling precursor for the D(2/3) PET agent [(18)F]fallypride. In the course of our studies, we also discovered two novel labeling precusors, the previously undescribed mesylate and chloro congeners of fallypride.
这封信描述了一种新的多克合成协议,用于制备 D(2/3) PET 代理 [(18) F] fallypride 的经典甲苯磺酸盐标记前体。在我们的研究过程中,我们还发现了两种新的标记前体,即之前未描述的甲磺酸盐和落草胺的氯同系物。
In vitro affinities of various halogenated benzamide derivatives as potential radioligands for non-invasive quantification of D2-like dopamine receptors
Benzamide derivatives as radiotracers have played an important role in diagnosing malfunction in dopaminergic neurotransmission. A variety of halogenated and two unsubstituted benzamide derivatives were synthesised and their in vitro affinities to dopaminergic, serotonergic and adrenergic receptors and their lipophilicities were determined. As references IBZM (3), raclopride (4) and FLB457 (5) were tested as well. The two iodinated compounds NAE (27) and NADE (28) displayed K-i values of 0.68 and 14 nM for the D-2 receptor. The well-established radiotracers FP (1) and DMFP (2) showed affinities in the same range as did the brominated compounds NABrE (29) and NABrDE (30). The logD(7.4) values of 2.91 for NAE (27) and of 2.81 for NADE (28) are in the range of those found for IBZM (3), FP (1) and DMFP (2). These facts allow to expect good properties for the two iodinated compounds NAE (27) and NADE (28) regarding in vivo imaging with SPECT. (C) 2007 Elsevier Ltd. All rights reserved.
METAL OXIDE CATALYZED RADIOFLUORINATION
申请人:The Regents of the University of California
公开号:US20170224851A1
公开(公告)日:2017-08-10
Inter alia, the first titania-catalyzed [
18
F]-radiofluorination in highly aqueous medium is provided. In embodiments, the method utilizes titanium dioxide, 1:1 acetonitrile-thexyl alcohol solvent mixture and tetrabutylammonium bicarbonate as a base. Radiolabeling may be directly performed with aqueous [
18
F]fluoride without the need for drying/azeotroping step, which reduces radiosynthesis time while keeping high fluoride conversion. The general applicability of the synthetic strategy to the synthesis of the wide range of PET probes from tosylated precursors is demonstrated.