Synthesis of organotrialkylstannanes. The reaction between organic halides and hexaalkyldistannanes in the presence of palladium complexes
作者:Hormoz Azizian、Colin Eaborn、Alan Pidcock
DOI:10.1016/s0022-328x(00)84615-x
日期:1981.7
give YC6H4CH2SnR3 for (a) R = n-Bu, Y = H, m-OMe, p-OMe, m-Cl, m-CN, and m-NO2, and (b) R = Me, Y = m-Cl, m-CN, p-CN and m-NO2. These reactions are of special value as preparative procedures in cases in which Grignard or organolithium reagents cannot be used. Allyl chloride and bromide were likewise shown to react with (n-Bu3Sn)2 to give CH2CHCH2SnBu3, but n-BuCl and n-BuBr gave only a trace of n-Bu4Sn
Palladium(0)-Catalyzed Preparation of 4-Arylpyrazoles
作者:José Elguero、Carlos Jaramillo、Carmen Pardo
DOI:10.1055/s-1997-1230
日期:1997.5
A general method for the palladium(0)-catalyzed preparation of 4-arylpyrazoles 2, by coupling of either 4-halopyrazoles 3 with arylstannanes 4 or 4-tributylstannyl-1-tritylpyrazole 5 with aryl iodides 6, is reported. Deprotection of trityl and/or methyl groups in compounds 2 led to N-unsubstituted 4-arylpyrazoles 1.
Synthesis and biological evaluation of 9-substituted tetracycline derivatives
作者:Darrell J Koza、Yaw A Nsiah
DOI:10.1016/s0960-894x(02)00369-4
日期:2002.8
The synthesis of 9-substituted tetracycline derivatives has been accomplished by the reaction of C9 diazonium tetrafluoroborate tetracycline salts with organotin reagents under modified Stille coupling conditions. Several of these unreported derivatives show promising in vitro biological activity against tetracycline resistant and antibiotic resistant bacteria.
Synthesis and evaluation of novel radioiodinated PSMA targeting ligands for potential radiotherapy of prostate cancer
作者:Xinyue Yao、Zhihao Zha、Karl Ploessl、Seok Rye Choi、Ruiyue Zhao、David Alexoff、Lin Zhu、Hank F. Kung
DOI:10.1016/j.bmc.2020.115319
日期:2020.3
Radioligand therapy (RLT) using prostate-specific membrane antigen (PSMA) targeting ligands is an attractive option for the treatment of Prostate cancer (PCa) and its metastases. We report herein a series of radioiodinated glutamate-urea-lysine-phenylalanine derivatives as new PSMA ligands in which L-tyrosine and L-glutamic acid moieties were added to increase hydrophilicity concomitant with improvement of in vivo targeting properties. Compounds 8, 15, 19a/19b and 23a/23b were synthesized and radiolabeled with I-125 by iododestannylation. All iodinated compounds displayed high binding affinities toward PSMA (IC50 = 1-13 nM). In vitro cell uptake studies demonstrated that compounds containing an L-tyrosine linker moiety (8, 15 and 19a/19b) showed higher internalization than MIP-1095 and 23a/23b, both without the L-tyrosine linker moiety. Biodistribution studies in mice bearing PC3-PIP and PC3 xenografts showed that [I-125]8 and [I-125]15 with higher lipophilicity exhibited higher nonspecific accumulations in the liver and intestinal tract, whereas [I-125]19a/19b and [I-125]23a/23b containing additional glutamic acid moieties showed higher accumulations in the kidney and implanted PC3-PIP (PSMA+) tumors. [I-125]23b displayed a promising biodistribution profile with favorable tumor retention, fast clearance from the kidney, and 2-3-fold lower uptake in the liver and blood than that observed for [I-125]MIP-1095. [I-125/131]23b may serve as an optimal PSMA ligand for radiotherapy treatment of prostate cancer over-expressing PSMA.