Synthesis, in vitro screening and in vivo evaluation of cyclic RGD analogs cyclized through oxorhenium and oxotechnetium coordination
摘要:
A library of RGD tripeptide analogs cyclized through oxorhenium coordination by an NS2/S chelation motif was synthesized. Screening towards integrins alpha V beta 3, alpha llb beta 3 and alpha V beta 5 led to the identification of 6 oxorhenium complexes that bind to integrin alpha V beta 3 in the submicromolar range. In vivo evaluation of five of the corresponding oxotechnetium complexes using nude mice bearing a U87MG human tumor xenograft showed a significant and specific accumulation of radioactivity inside the tumor. The best results in vivo were obtained with complexes Tc-16 and Tc-50 that displayed a higher tumor accumulation and a lower distribution in other tissues relative to a reference cyclopentapeptide tracer. (C) 2011 Elsevier Masson SAS. All rights reserved.
Chromatography-Free Wittig Reactions Using a Bifunctional Polymeric Reagent
作者:Peter Shu-Wai Leung、Yan Teng、Patrick H. Toy
DOI:10.1021/ol1021614
日期:2010.11.5
The first example of a polystyrene bearing two distinct reagent groups has been prepared. This phosphine and amine functionalized material was used in one-pot Wittig reactions with an aldehyde and either an α-halo-ester, -ketone, or -amide. Due to the heterogeneous nature of the polymer, the desired alkene product of these reactions could be isolated in excellent yield in essentially pure form after
Gold(I) can exhibit a cooperative effect with triphenylphosphine, accelerating the triphenylphosphine-mediated partial hydrogenation of activated alkynes. In this protocol, 3-arylpropiolates are selectively reduced to the Z-isomer when the aryl ring bears an electron-donor substituent, whereas 3-arylpropynones are reduced to the E-isomers.
1,3-Diphenyldisiloxane Enables Additive-Free Redox Recycling Reactions and Catalysis with Triphenylphosphine
作者:Courtney C. Aldrich、Joseph A. Buonomo、Malcolm S. Cole、Carter G. Eiden
DOI:10.1055/s-0040-1707345
日期:2020.12
variants of the Wittig olefination, Appel halogenation, and Staudingerreduction. Triphenylphosphine-promoted catalytic recycling reactions were also facilitated by DPDS. Additive-free triphenylphosphine-promoted catalyticStaudingerreductions could even be performed at ambient temperature due to the rapid nature of phosphinimine reduction, for which we characterized kinetic and thermodynamic parameters
N,N,N′,N′-Tetramethylenediamine dioxide (TMEDAO<sub>2</sub>) facilitates atom economical/open atmosphere Ley–Griffith (TPAP) tandem oxidation-Wittig reactions
作者:Christopher D. G. Read、Peter W. Moore、Craig M. Williams
DOI:10.1039/c5gc01346a
日期:——
N,N,N′,N′-Tetramethylethylenediamine dioxide (TMEDAO2) was explored as a more atom economical co-oxidant for the Ley–Griffith oxidation of alcohols to aldehydes.
N, N, N′, N′-四甲基乙二胺二氧化物(TMEDAO2)被探讨作为 Ley–Griffith 氧化醇制醛反应中更具原子经济性的辅助氧化剂。
A RuII–N-heterocyclic carbene (NHC) complex from metal–metal singly bonded diruthenium(I) precursor: Synthesis, structure and catalytic evaluation
作者:Arup Sinha、Prosenjit Daw、S.M. Wahidur Rahaman、Biswajit Saha、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2010.11.003
日期:2011.3
oxidative cleavage of the metal–metal singly-bonded diruthenium(I) precursor [Ru2(CO)4(CH3CN)6(OTf)2] with 1,8-naphthyridine functionalized NHC precursor 1-benzyl-3-(5,7-dimethyl-1,8-naphthyrid-2-yl)imidazolium bromide (BIN·HBr) at room temperature. Compound 1 catalyzestransferhydrogenation of ketones to alcohols, and carbene-transfer from ethyl diazoacetate to a variety of substrates. It is shown to