2139-44-8Relevant articles and documents
Cell-surface engineering by a conjugation-and-release approach based on the formation and cleavage of oxime linkages upon mild electrochemical oxidation and reduction
Pulsipher, Abigail,Dutta, Debjit,Luo, Wei,Yousaf, Muhammad N.
, p. 9487 - 9492 (2014)
We report a strategy to rewire cell surfaces for the dynamic control of ligand composition on cell membranes and the modulation of cell-cell interactions to generate three-dimensional (3D) tissue structures applied to stem-cell differentiation, cell-surfa
In situ modulation of cell behavior via smart dual-ligand surfaces
Pulsipher, Abigail,Park, Sungjin,Dutta, Debjit,Luo, Wei,Yousaf, Muhammad N.
, p. 13656 - 13666 (2014)
Due to the highly complex nature of the extracellular matrix (ECM), the design and implementation of dynamic, stimuli-responsive surfaces that present well-defined ligands and serve as model ECM substrates have been of tremendous interest to biomaterials,
Could redox-switched binding of a redox-active ligand to a copper(II) centre drive a conformational proton pump gate? A synthetic model study
He, Zhicong,Colbran, Stephen B.,Craig, Donald C.
, p. 116 - 129 (2003)
A proposal for a redox-linked conformational gate to proton translocation - a proton pump gate - based upon a transition-metal redox-switchable hemilabile ligand (RHL) system is made. Consideration of the requirements for such a system reveals copper-(II)
Efficient Palladium-Catalyzed Aerobic Oxidative Carbocyclization to Seven-Membered Heterocycles
Liu, Jie,B?ckvall, Jan-E.
supporting information, p. 15513 - 15518 (2020/10/23)
The use of molecular oxygen in palladium-catalyzed oxidation reactions is highly widespread in organic chemistry. However, the direct reoxidation of palladium by O2 is often kinetically unfavored, thus leading the deactivation of the palladium catalyst during the catalytic cycle. In the present work, we report a highly selective palladium-catalyzed carbocyclization of bisallenes to seven-membered heterocycles under atmospheric pressure of O2. The use of a homogenous hybrid catalyst (Co(salophen)-HQ, HQ=hydroquinone) significantly promotes efficient electron transfer between the palladium catalyst and O2 through a low-energy pathway. This aerobic oxidative transformation shows broad substrate scope and functional group compatibility and allowed the preparation of O-containing seven-membered rings in good yields in most cases.
Novel Flavonoids Derivative, its Preparation Method and Composition Comprising the Same
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Paragraph 0139-0142, (2018/10/16)
The present invention relates to a novel flavonoid derivative, a preparation method thereof, and a cosmetic composition or a composition for external application for skin containing the novel flavonoid derivative as an active ingredient. The novel flavono
Diels-Alder trapping of in situ generated dienes from 3,4-dihydro-2H-pyran with p-quinone catalysed by p-toluenesulfonic acid
Mohan Raj, Radhakrishnan,Balasubramanian, Kalpattu K.,Easwaramoorthy, Deivanayagam
supporting information, p. 1115 - 1121 (2017/02/10)
This comprehensive study portrays that p-toluenesulfonic acid is a more efficient catalyst for the reaction between p-quinones and 3,4-dihydro-2H-pyran, than the Lewis acids. The products were accomplished by the Diels-Alder cycloaddition reaction and their mechanistic pathways have been formulated. The impact of C2 and C2,5 substituents of the p-quinones on the cycloaddition reaction has been explored. Remarkably, it is the first report to explore this kind of in situ generated diene for the Diels-Alder cycloaddition reaction.
Polypeptide Immobilization
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Paragraph 0170, (2016/01/15)
The present invention provides a method, comprising (a) providing a reactant ligand attached to a substrate; (b) contacting the substrate with a fusion polypeptide, said fusion polypeptide comprising a capture polypeptide fused to a display polypeptide un
Efficient synthesis of hybrid (hydroquinone-schiff base)cobalt oxidation catalysts
Johnston, Eric V.,Karlsson, Erik A.,Tran, Lien-Hoa,Akermark, Bjoern,Baeckvall, Jan-E.
experimental part, p. 3973 - 3976 (2010/02/27)
hybrid catalysts A and B have recently been found to efficiently transfer electrons from a metal catalyst to molecular oxygen in biomimetic oxidations. In the present work hybrid catalysts a and b were synthesized, in high yield from, inexpensive starting
Convenient tetrahydropyranylation of alcohols and phenols by catalytic ferric sulfate hydrate (Fe2(SO4)3· xH2O)
Li, Lingjun,Zhu, Lizhi,Zhang, Xinying,Zhang, Guisheng,Qu, Guirong
, p. 1120 - 1123 (2007/10/03)
Ferric sulfate hydrate (Fe2(SO4)3· xH2O) is found to be an efficient heterogeneous catalyst for the tetrahydropyranylation of alcohols and phenols at ambient or near ambient temperature. In addition, selective monotetrahydropyranylation of symmetrical diols is achieved under similar conditions. The deprotection of THP ether and direct transformation of THP ether to the corresponding acetate by Fe 2(SO4)3·xH2O is also studied. The simplicity of manipulation, mild conditions, reusable catalyst, good selectivity, and environment benign characters make this method a good alternative way for the THP protection of alcohols.
Strategies for the synthesis of bi- and triarylic materials starting from commercially available phenols
Chopa, Alicia B.,Silbestri, Gustavo F.,Lockhart, María T.
, p. 3865 - 3877 (2007/10/03)
A series of arylstannanes have been synthesized, through an SRN1 mechanism, in good to excellent yields (74%-99%) by the photostimulated reaction of trimethyl stannyl ion with substrates supporting different nucleofugal groups. The arylstannanes thus obtained were suitable intermediates for Stille cross-coupling reactions leading to asymmetric bi- and triaryl compounds in acceptable global yields. An attractive feature of this route is that simple commercially available benzenediols, chloro- and methoxy phenols might be useful starting substrates, leading the latter to higher global yields of products in fewer steps. The strategies proposed open a broad synthetic tool.
