Results 91 to 100 of about 216,387 (290)

Synthesis of pyrrolizines by intramolecular capture of 1,4-dipolar intermediates in reactions of enamines with dimethyl acetylenedicarboxylate [PDF]

, 1981
Solvent polarity and reaction temperature strongly influence the reactions of dimethyl acetylenedicar-boxylate (DMAD) with 1-pyrrolidinyl enamines of acyclic and cyclic ketones. Whereas DMAD and 1-[1-phenyl-2-(phenylthio)ethenyl]pyrrolidine (3) give only
Harkema, S., Hummel, G.J. van, Reinhoudt, D.N., Trompenaars, W.P., Verboom, W., Visser, G.W.   +5 more
core   +3 more sources

Cycloaddition of Diphenylnitrilimine to 1,5-Benzodiazepines [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2000
The cycloaddition reaction of diphenylnitrilimine on the 1,5-benzodiazepines has been studied. New molecules of triazolobenzodiazepines type have been isolated and characterized.
Rachid Zinber, Redouane Achour, Ahmed Jalal El Hajji, Asmaa Hakan, Mohammed Zoubair Cherkaui   +4 more
doaj  

Network-analysis-guided synthesis of weisaconitine D and liljestrandinine. [PDF]

, 2015
General strategies for the chemical synthesis of organic compounds, especially of architecturally complex natural products, are not easily identified. Here we present a method to establish a strategy for such syntheses, which uses network analysis.
Gallego, GM, Kou, KGM, Kulyk, S, Lebold, TP, Lee, JC, Lilien, R, Marth, CJ, Qin, J, Sarpong, R   +8 more
core   +2 more sources

A Two-Dimensional Polymer Synthesized through Topochemical [2 + 2]-Cycloaddition on the Multigram Scale.

Journal of the American Chemical Society, 2017
The single-crystal-to-single-crystal (scsc) synthesis of a 2D polymer based on photochemically triggered [2 + 2]-cycloaddition is reported. Both monomer and polymer single crystals are analyzed by X-ray diffraction, which is the first case of a scsc two ...
Ralph Z. Lange, G. Hofer, T. Weber, A. Schlüter   +3 more
semanticscholar   +1 more source

Preparation of 4 '-spirocyclobutyl nucleoside analogues as novel and versatile adenosine scaffolds

, 2019
Despite the large variety of modified nucleosides that have been reported, the preparation of constrained 4 '-spirocyclic adenosine analogues has received very little attention.
De Vleeschouwer, Freija, Kong, Hanchu, Meerpoel, Lieven, Pande, Vineet, Sun, Weimei, Thuring, Jan Willem, Van Hecke, Kristof, Verhoeven, Jonas, Verniest, Guido, Vos, Ann, Wu, Tongfei   +10 more
core   +1 more source

Synthesis and reactivity of spiro-fused β-lactams [PDF]

, 2011
A
D'hooghe, Matthias, De Kimpe, Norbert, Singh, Girija S   +2 more
core   +2 more sources

A surprising steric effect on a tandem cycloaddition/ring-opening reaction : rapid syntheses of difluorinated analogues of (hydroxymethyl)conduritols [PDF]

, 2004
Difluorinated analogues of (hydroxymethyl)conduritols can be synthesised from selected furans and a difluorinated dienophile in two reaction ...
Fawcett, J., Hillier, I.H., Moralee, A.C., Percy, Jonathan, Salafia, Vittoria, Vincent, M.A.   +5 more
core   +1 more source

Promotion mechanism of hydroxyl groups in catalyzing CO2 cycloaddition

Journal of CO2 Utilization
In this study, a series of hydroxy-functionalized quaternary ammonium salt catalysts, i.e., NEt3(HE)Br, NEt2(HE)2Br, NEt1(HE)3Br, and N(HE)4Br, were successfully prepared by quantitatively grafting hydrogen-bond donors (HBDs) as electrophilic sites on ...
Yiming Wang, Wensheng Wei, Yuxin Wang, Guangwen Xu, Jinggang Zhao, Lei Shi   +5 more
doaj  

Catalytic enantioselective synthesis of quaternary carbon stereocentres. [PDF]

, 2014
Quaternary carbon stereocentres-carbon atoms to which four distinct carbon substituents are attached-are common features of molecules found in nature. However, before recent advances in chemical catalysis, there were few methods of constructing single ...
Overman, Larry E, Quasdorf, Kyle W
core  

A Palladium-Catalyzed Vinylcyclopropane (3 + 2) Cycloaddition Approach to the Melodinus Alkaloids [PDF]

, 2011
A palladium-catalyzed (3 + 2) cycloaddition of a vinylcyclopropane and a β-nitrostyrene is employed to rapidly assemble the cyclopentane core of the Melodinus alkaloids.
Goldberg, Alexander F. G., Stoltz, Brian M.   +1 more
core   +2 more sources