The direct preparation of a kind of fluorinatingreagent 1 [F‐TEDA‐N(SO2Ph)2] was realized in high yield via the complexation of N‐fluorobenzenesulfonimide (NFSI) with 1‐(chloromethyl)‐1,4‐diazabicyclo[2.2.2]octan‐1‐ium N′,N′‐bis‐(benzenesulfonylimide) salt. In its fluorination to oxindoles, the fluorinating products 6 were afforded in moderate to high yields.
Site-Selective, Late-Stage C−H <sup>18</sup>
F-Fluorination on Unprotected Peptides for Positron Emission Tomography Imaging
作者:Zheliang Yuan、Matthew B. Nodwell、Hua Yang、Noeen Malik、Helen Merkens、François Bénard、Rainer E. Martin、Paul Schaffer、Robert Britton
DOI:10.1002/anie.201806966
日期:2018.9.24
Peptides are often ideal ligands for diagnostic molecular imaging due to their ease of synthesis and tuneable targeting properties. However, labelling unmodified peptides with 18F for positronemissiontomography (PET) imaging presents a number of challenges. Here we show the combination of photoactivated sodium decatungstate and [18F]‐N‐fluorobenzenesulfonimide effects site‐selective 18F‐fluorination
Direct heterobenzylic fluorination, difluorination and trifluoromethylthiolation with dibenzenesulfonamide derivatives
作者:Michael Meanwell、Bharani Shashank Adluri、Zheliang Yuan、Josiah Newton、Philippe Prevost、Matthew B. Nodwell、Chadron M. Friesen、Paul Schaffer、Rainer E. Martin、Robert Britton
DOI:10.1039/c8sc01221k
日期:——
Functionalization of heterocyclic scaffolds with mono- or difluoroalkyl groups provides unique opportunities to modulate drug pKa, influence potency and membrane permeability, and attenuate metabolism. While advances in the addition of fluoroalkyl radicals to heterocycles have been made, direct C(sp3)–H heterobenzylic fluorination is comparatively unexplored. Here we demonstrate both mono- and difluorination
具有单或二氟烷基的杂环支架的功能化提供了调节药物p K a,影响效价和膜通透性以及减弱新陈代谢的独特机会。尽管已经取得了在杂环上添加氟代烷基自由基的进展,但是相对而言,尚没有直接进行C(sp 3)–H杂苄基氟化反应的研究。在这里,我们证明了使用便利方法的一系列烷基杂环的单氟化和二氟化反应,该方法依赖于亲电氟化剂N-氟苯磺酰亚胺的瞬时磺酰化作用。我们还报告了杂苄基三氟甲基硫醇化和18 F-氟化,为后期C(sp 3)–药物线索的H功能化和放射性示踪剂的发现。
<sup>18</sup>F-Fluorination of Unactivated C–H Bonds in Branched Aliphatic Amino Acids: Direct Synthesis of Oncological Positron Emission Tomography Imaging Agents
作者:Matthew B. Nodwell、Hua Yang、Milena Čolović、Zheliang Yuan、Helen Merkens、Rainer E. Martin、François Bénard、Paul Schaffer、Robert Britton
DOI:10.1021/jacs.6b11533
日期:2017.3.15
photocatalytic C-H 18F-fluorination reaction has been developed that provides direct access to 18F-fluorinated aminoacids. The biodistribution and uptake of three 18F-labeled leucine analogues via LAT1 mediated transport in several cancer cell lines is reported. Positron emission tomography imaging of mice bearing PC3 (prostate) or U87 (glioma) xenografts using 5-[18F]-fluorohomoleucine showed high tumor