17435-72-2Relevant academic research and scientific papers
A new end group structure of poly(ethylene glycol) for hydrolysis-resistant biomaterials
Tong, Xinming,Lai, Jingjing,Guo, Bao-Hua,Huang, Yanbin
, p. 1513 - 1516 (2011)
A new PEG end-group structure (α-PEG-MA) was designed and synthesized. When compared with the conventionally used PEG-acrylate structure, the vinyl group in the new structure showed comparable reactivity in thiol-ene reactions, but the formed materials were hydrolysis resistant because there is no ester linkage in the backbone chains. Copyright
Design, synthesis and evaluation of [3H]PF-7191, a highly specific nociceptin opioid peptide (NOP) receptor radiotracer for in vivo receptor occupancy (RO) studies
Zhang, Lei,Drummond, Elena,Brodney, Michael A.,Cianfrogna, Julie,Drozda, Susan E.,Grimwood, Sarah,Vanase-Frawley, Michelle A.,Villalobos, Anabella
, p. 5219 - 5223 (2014)
Herein we report the identification of (+)-N-(2-((1H-pyrazol-1-yl)methyl)-3-((1R,3r,5S)-6′-fluoro-8-azaspiro[bicyclo[3.2.1]octane-3,1′-isochroman]-8-yl)propyl)-N-[3H]-methylacetamide {[3H]PF-7191 [(+)-11]} as a promising radiotracer for the nociceptin opioid peptide (NOP) receptor. (+)-11 demonstrated high NOP binding affinity (Ki = 0.1 nM), excellent selectivity over other opioid receptors (>1000×) and good brain permeability in rats (Cb,u/Cp,u = 0.29). Subsequent characterization of [3H](+)-11 showed a high level of specific binding and a brain bio-distribution pattern consistent with known NOP receptor expression. Furthermore, the in vivo brain binding of [3H](+)-11 in rats was inhibited by a selective NOP receptor antagonist in a dose-responsive manner. This overall favorable profile indicated that [3H](+)-11 is a robust radiotracer for pre-clinical in vivo receptor occupancy (RO) measurements and a possible substrate for carbon-11 labeling for positron emission tomography (PET) imaging in higher species.
Copper-catalyzed radical oxyallylation of olefins for the construction of alkene-containing isoxazolines
He, Xiaoxue,Qian, Lijie,Dai, Yuyu,Yan, Xinhuan,Li, Xiaoqing,Xu, Xiangsheng
, (2021/05/31)
A radical-mediated approach to alkene oxyallylation using allylic oximes is described. The reaction proceeds under copper-catalytic redox-neutral conditions and tolerates various functional groups. This protocol thus enables the synthesis of structurally valuable isoxazolines and the introduction of a versatile olefin motif in a single step.
Copper-Catalyzed Intermolecular Alkynylation and Allylation of Unactivated C(sp3)-H Bonds via Hydrogen Atom Transfer
Liang, Lei,Guo, Ge,Li, Chen,Wang, Song-Lin,Wang, Yue-Hui,Guo, Hai-Ming,Niu, Hong-Ying
, p. 8575 - 8579 (2021/11/13)
We describe Cu-catalyzed intermolecular alkynylation and allylation of unactivated C(sp3)-H bonds with singly occupied molecular orbital-philes (SOMO-philes) via hydrogen atom transfer (HAT). Employing N-fluoro-sulfonamide as a HAT reagent, a set of subst
An efficient and simple strategy toward the synthesis of highly functionalized compounds
Jmai, Momtez,Efrit, Mohamed Lotfi,Dubreuil, Didier,Blot, Virginie,Lebreton, Jacques,M'rabet, Hédi
, p. 978 - 995 (2021/08/06)
The expedient syntheses of small libraries of ((β-ethoxycarbonyl, -cyano and -acetyl)propyloxy) methylphosphonate scaffolds bearing olefin, sulfanyl, or amine functions are described. All these new derivatives are readily produced from easily available starting reagents (aldehydes, electron-poor olefins, and dialkylphosphites) following a three steps reaction sequence of condensations, SN2′-type reaction and a conjugated thia- or aza-Michael 1,4-addition with aromatic and aliphatic thiol or amine nucleophiles.
Catalytic Cleavage of C(sp2)-C(sp2) Bonds with Rh-Carbynoids
Wang, Zhaofeng,Jiang, Liyin,Sarró, Pau,Suero, Marcos G.
supporting information, p. 15509 - 15514 (2019/10/11)
We report a catalytic strategy that generates rhodium-carbynoids by selective diazo activation of designed carbyne sources. We found that rhodium-carbynoid species provoke C(sp2)-C(sp2) bond scission in alkenes by inserting a monovalent carbon unit between both sp2-hybridized carbons. This skeletal remodeling process accesses synthetically useful allyl cation intermediates that conduct to valuable allylic building blocks upon nucleophile attack. Our results rely on the formation of cyclopropyl-I(III) intermediates able to undergo electrocyclic ring-opening, following the Woodward-Hoffmann-DePuy rules.
Photoredox-Coupled F-Nucleophilic Addition: Allylation of gem-Difluoroalkenes
Liu, Haidong,Ge, Liang,Wang, Ding-Xing,Chen, Nan,Feng, Chao
, p. 3918 - 3922 (2019/02/19)
A novel strategy for the expedient construction of CF3-embeded tertiary/quarternary carbon centers was developed by taking advantage of photoredox catalysis. Thanks to a key step of single-electron oxidation, electron-rich gem-difluoroalkenes, which otherwise are essentially reluctant towards F-nucleoplilic addition, now readily participate in this fluoroallylation reaction. Furthermore, this strategy provides an elegant example for the generation, as well as functionalization, of α-CF3-substituted benzylic radical intermediates using cheap and readily available starting materials.
Zinc-Mediated Double Addition on Functionalized Nitriles
Caillé, Julien,Pantin, Mathilde,Boeda, Fabien,Pearson-Long, Morwenna S.M.,Bertus, Philippe
, p. 1329 - 1341 (2019/03/08)
Allylzinc reagents were used to access highly functionalized tertiary carbinamine derivatives in high yields from cyanoesters and cyanocarbonates. While the monoaddition of organometallics on nitriles is generally observed, in this work the nucleophilic a
Photoredox-Catalyzed Cyclopropanation of 1,1-Disubstituted Alkenes via Radical-Polar Crossover Process
Luo, Wenping,Yang, Yi,Fang, Yewen,Zhang, Xinxin,Jin, Xiaoping,Zhao, Guicai,Zhang, Li,Li, Yan,Zhou, Wanli,Xia, Tingting,Chen, Bin
, p. 4215 - 4221 (2019/08/16)
The photoredox-neutral catalyzed cyclopropanation of 1,1-disubstituted alkenes via radical addition-anionic cyclization cascade has been successfully developed. Another new protocol based on photocatalytic allylation and cyclopropanation cascade was also described between allylic halide and halomethyl radical. In addition to the successful use of bis-catecholato silicates as the alkyl radical precursors, the acyl and alkyl radicals derived from 1,4-dihydropyridines were also engaged in this radical-polar crossover process. The competing experiments displayed that the 3-exo-tet mode of cyclization preferred over 4-exo and 5-exo cyclization modes, allowing for the selective 3-exo-tet cyclization. The superior nucleofuge character of bromide over chloride and tosylate has been demonstrated in the reaction of bromomethyl radical with homoallylic (pseudo)halides. This new protocol is characterized by its redox-neutral process, broad substrate scope, mild conditions, and good functional-group compatibility. (Figure presented.).
Intermolecular Aminoallylation of Alkenes Using Allyl-Oxyphthalimide Derivatives: A Case Study in Radical Polarity Effects
Lardy, Samuel W.,Schmidt, Valerie A.
, p. 6796 - 6799 (2019/11/03)
A case study on the polarity effects of radical mediated intermolecular alkene aminoallylation is presented herein. This radical group transfer method pairs vinyl ethers with electronically deficient allyl-oxyphthalimide derivatives to give difunctionalized products while illustrating the guiding effects of polarity on this radical reactivity.
