Organometallic 99mTc-technetium(I)- and Re-rhenium(I)-folate derivatives for potential use in nuclear medicine
作者:Cristina Müller、Cécile Dumas、Ute Hoffmann、P. August Schubiger、Roger Schibli
DOI:10.1016/j.jorganchem.2004.08.045
日期:2004.12
α-folate derivative or – if directly attached to pteroic acid – the pteroate derivative. The derivatives were reacted with the precursor [M(OH2)3(CO)3]+ (M = 99mTc, Re) to form uniform organometallic folate complexes under mild reaction conditions. All compounds were chemically characterized by means of NMR, MS, IR and HPLC. The determination of the IC50-values for the PAMA-γ-folate derivative (100 nM)
Pyrolidine derivatives useful in treatment of hepatitis C virus infection
申请人:3 D Gene Pharma
公开号:EP1408031A1
公开(公告)日:2004-04-14
The present invention relates to novel hepatitis C virus ("HCV") protease inhibitors or other flavivirus protease inhibitors of formula,
pharmaceutical compositions containing one or more such inhibitors, methods for preparing such inhibitors, uses of these compounds to treat hepatitis C and related disorders together with their use for their activity towards NS3 serine protease, intermediary compounds for the method of preparation of said compounds and screening methods. The invention specifically discloses novel chemical compounds as inhibitors of the HCV serine protease.
Comparative Studies of Three Pairs of α- and γ-Conjugated Folic Acid Derivatives Labeled with Fluorine-18
作者:Silvan D. Boss、Thomas Betzel、Cristina Müller、Cindy R. Fischer、Stephanie Haller、Josefine Reber、Viola Groehn、Roger Schibli、Simon M. Ametamey
DOI:10.1021/acs.bioconjchem.5b00644
日期:2016.1.20
The folate receptor (FR) is upregulated in various epithelial cancer types (FR α-isoform), while healthy tissues show only restricted expression. FR-targeted imaging using folate radiopharmaceuticals is therefore a promising approach for the detection of FR-positive cancer tissue. Almost all folate-based radiopharmaceuticals have been prepared by conjugation at the γ-carboxylic functionality of the glutamate moiety of folic acid. In this work, three pairs of fluorinated α- and γ-conjugated folate derivatives were synthesized and their in vitro and in vivo properties compared. The syntheses of all six regioisomers were obtained in good chemical yields using a multistep synthetic approach including the highly selective Cu(I)-catalyzed 1,3-dipolar cycloaddition. The radiosyntheses of the α- and γ-conjugated 18F-labeled folate derivatives were accomplished in moderate to good radiochemical yields, high radiochemical purities (>95%), and specific activities ranging from 25 to 196 GBq/μmol. In vitro, all folate derivatives showed high binding affinity to the FR-α (IC50 = 1.4–2.2 nM). In vivo PET imaging and biodistribution studies in FR-positive KB tumor-bearing mice demonstrated similar FR-specific tumor uptake for both regioisomers of each pair of compounds. However, FR-unspecific liver uptake was significantly lower for the α-regioisomers compared to the corresponding γ-regioisomers. In contrast, kidney uptake was up to 50% lower for the γ-regioisomers than for the α-regioisomers. These results show that the site of conjugation in the glutamyl moiety of folic acid has a significant impact on the in vivo behavior of 18F-based radiofolates, but not on their in vitro FR-binding affinity. These findings may potentially stimulate new directions for the design of novel 18F-labeled folate-based radiotracers.
Synthesis of peptides containing S-(N-alkylcarbamoyl)cysteine residues, metabolites of N-alkylformamides in rodents and in humans
作者:Michael D. Threadgill、Adrian P. Gledhill
DOI:10.1021/jo00273a031
日期:1989.6
Reduced <sup>18</sup>F-Folate Conjugates as a New Class of PET Tracers for Folate Receptor Imaging
作者:Silvan D. Boss、Cristina Müller、Klaudia Siwowska、Josephine I. Büchel、Raffaella M. Schmid、Viola Groehn、Roger Schibli、Simon M. Ametamey
DOI:10.1021/acs.bioconjchem.7b00775
日期:2018.4.18
four 18F-labeled 5-MTHF derivatives conjugated at either the α- or γ-carboxylic functionality of glutamate and to assess their suitability for FR-targeting. Organic syntheses of the precursors and the four reference compounds, namely, 6S-α, 6S-γ, 6R-α, and 6R-γ-click-fluoroethyl-5-MTHF, were carried out in low to moderate overall chemical yields. The radiosyntheses of the α- and γ-conjugated 18F-labeled