Results 31 to 40 of about 4,038 (213)

Site-Selective Modification of a Porpholactone—Selective Synthesis of 12,13- and 17,18-Dihydroporpholactones

Molecules, 2020
The reaction of meso-tetrakis(pentafluorophenyl)porpholactone with azomethine ylides and nitrones affords pyrrolidine-fused and isoxazolidine-fused dihydroporpholactones that display, respectively, isobacteriochlorin- and chlorin-type UV–Vis spectra ...
Ana F. R. Cerqueira, Gustautas Snarskis, Jonas Zurauskas, Samuel Guieu, Filipe A. Almeida Paz, Augusto C. Tomé   +5 more
doaj   +1 more source

Catalysis of a 1,3-dipolar reaction by distorted DNA incorporating a heterobimetallic platinum(II) and copper(II) complex [PDF]

, 2017
A novel catalytic system based on covalently modified DNA is described. This catalyst promotes 1,3-dipolar reactions between azomethine ylides and maleimides.
Aboudzadeh, Ali, Bittner, Alexander J., Cossío Mora, Fernando Pedro, De Cózar Ruano, Abel, Eleta-Lopez, Aitziber, Hernandez, Frank J., Miranda, José I., Rivilla de la Cruz, Iván, Santos, José I., Schäfer, Thomas   +9 more
core   +2 more sources

Highly Efficient Construction of Sugar-Fused Spirochromanono Pyrrolidines/Pyrrolizidines/Thiolizidines via 1,3-Dipolar Cycloaddition of Azomethine Ylides

SynOpen, 2017
A variety of sugar-fused chromanono pyrrolidines/pyrrolizidines/thiolizidines have been synthesized by intermolecular 1,3-dipolar cycloaddition reaction of azomethine ylides (generated from glucose aldehyde and different secondary amino acids) with ...
Sirisha Nallamala, Srikumar Mannem, Raghunathan Raghavachary   +2 more
doaj   +1 more source

Efficient Diastereo- and Enantioselective Synthesis of exo-Nitroprolinates by 1,3-Dipolar Cycloadditions Catalyzed by Chiral Phosphoramidite⋅Silver(I) Complexes [PDF]

, 2014
Chiral complexes formed by privileged phosphoramidites and silver triflate or silver benzoate are excellent catalysts for the general 1,3-dipolar cycloaddition between azomethine ylides generated from α-amino acid-derived imino esters and nitroalkenes ...
Castelló Moncayo, Luis Miguel, Cossío Mora, Fernando Pedro, Cózar Ruano, Abel de, Larrañaga Agirre, Olatz, Nájera, Carmen, Sansano, Jose M.   +5 more
core   +2 more sources

A Facile Synthesis of Functionalized Dispirooxindole Derivatives via a Three-Component 1,3-Dipolar Cycloaddition Reaction

Molecules, 2013
An efficient synthesis of novel dispirooxindoles has been achieved through three-component 1,3-dipolar cycloaddition of azomethine ylides generated in situ by the decarboxylative condensation of isatin and an α-amino acid with the dipolarophile 5 ...
Liang Ouyang, Rongsheng Tong, Jianyou Shi, Zhixiang Yuan, Guang Ouyang, Jun He   +5 more
doaj   +1 more source

Metal-free α-amination of secondary amines: Computational and experimental evidence for azaquinone methide and azomethine ylide intermediates [PDF]

, 2013
We have performed a combined computational and experimental study to elucidate the mechanism of a metal-free α-amination of secondary amines. Calculations predicted azaquinone methides and azomethine ylides as the reactive intermediates and showed that ...
Dieckmann, A., Houk, K. N., Platonova, A. Y., Richers, M. T., Seidel, D., Zhang, C.   +5 more
core   +1 more source

Benzotriazolylmethylaminosilanes: Novel azomethine ylide equivalents

Tetrahedron, 1994
Abstract Benzotriazolylmethylaminosilanes, readily accessible from the reaction of benzotriazole, an aldehyde and an (aminomethyl)silane in water at 20°C, are azomethine ylide equivalents which undergo stereospecific cycloadditions with dipolarophiles to give substituted pyrrolidines or 2,5-dihydropyrroles in good yields.
Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, FL 32611-7200 USA ( host institution ), R. Katritzky, Alan, Köditz, Jens, Lang, Hengyuan   +3 more
openaire   +2 more sources

Enantiomerically Enriched 1,2-P,N-Bidentate Ferrocenyl Ligands for 1,3-Dipolar Cycloaddition and Transfer Hydrogenation Reactions

Molecules, 2018
Novel complexes of 1,2-P,N-bidentate ferrocenyl ligands with AgOAc or with [RuCl2(PPh3)3] as catalysts have been studied in asymmetric synthesis. The catalytic activity of these systems have been studied in [3+2]-cycloaddition of azomethine ylides with ...
Irina A. Utepova, Polina O. Serebrennikova, Marina S. Streltsova, Alexandra A. Musikhina, Tatiana G. Fedorchenko, Oleg N. Chupakhin, Andrey P. Antonchick   +6 more
doaj   +1 more source

Facile, Regio- and Diastereoselective Synthesis of Spiro-Pyrrolidine and Pyrrolizine Derivatives and Evaluation of Their Antiproliferative Activities

Molecules, 2014
A number of novel spiro-pyrrolidines/pyrrolizines derivatives were synthesized through [3+2]-cycloaddition of azomethine ylides with 3,5-bis[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones 2a–n.
Abdulrahman I. Almansour, Raju Suresh Kumar, Farzana Beevi, Amir Nasrolahi Shirazi, Hasnah Osman, Rusli Ismail, Tan Soo Choon, Brian Sullivan, Kellen McCaffrey, Alaa Nahhas, Keykavous Parang, Mohamed Ashraf Ali   +11 more
doaj   +1 more source

Stereoselective Ag-Catalyzed 1,3-Dipolar Cycloaddition of Activated Trifluoromethyl-Substituted Azomethine Ylides [PDF]

, 2016
This is the peer reviewed version of the following article: Chemistry – A European Journal 22.14 (2016): 4952 - 4959, which has been published in final form at http://doi.org/10.1002/chem.201504869. This article may be used for non-commercial purposes in
Adrio, Adrio, Arai, Bai, Beausoleil, Begue, Belhomme, Bezdudny, Bonin, Burger, Castello, Castelló, Chaume, Cheng, Corbett, Dai, Dai, Daly, Das, Erickson, Fritz, Fujiwara, González-Esguevillas, Gouverneur, Hashimoto, He, Huang, Khangarot, Kuhnert, Laduron, Li, Li, Li, Llamas, Ma, McAlpine, Michael, Müller, Nájera, O'Hagan, Ojima, Padilla, Pandey, Pascual-Escudero, Pellissier, Pinho e Melo, Potowski, Purser, Pyne, Roughley, Sato, Schlosser, Song, Stanley, Sun, Tanaka, Tran, van Niel, Whitby, Yan, Yang, Yuan, Zhao   +62 more
core   +2 more sources