Results 21 to 30 of about 161 (128)

Synthesis and Biological Evaluation of S-, O- and Se-Containing Dispirooxindoles

Molecules, 2021
A series of novel S-, O- and Se-containing dispirooxindole derivatives has been synthesized using 1,3-dipolar cycloaddition reaction of azomethine ylide generated from isatines and sarcosine at the double C=C bond of 5-indolidene-2-chalcogen-imidazolones
Maksim Kukushkin, Vladimir Novotortsev, Vadim Filatov, Yan Ivanenkov, Dmitry Skvortsov, Mark Veselov, Radik Shafikov, Anna Moiseeva, Nikolay Zyk, Alexander Majouga, Elena Beloglazkina   +10 more
doaj   +1 more source

Electro‐Synthesis of Organic Compounds with Heterogeneous Catalysis

Advanced Science, Volume 10, Issue 1, January 4, 2023., 2023
In this review, the most recent advances in synthesizing value‐added chemicals by heterogeneous catalysis are summarized, and an overview of electrocatalytic oxidation and reduction processes as well as paired electrocatalysis is also provided. Abstract Electro‐organic synthesis has attracted a lot of attention in pharmaceutical science, medicinal ...
Tariq Ali, Haiyan Wang, Waseem Iqbal, Tariq Bashir, Rahim Shah, Yong Hu   +5 more
wiley   +1 more source

Crystal structure of ethyl 1′,1′′-dimethyl-2′′,3-dioxo-3H-dispiro[benzo[b]thiophene-2,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxylate

Acta Crystallographica Section E: Crystallographic Communications, 2015
In the title compound, C23H22N2O4S, the pyrrolidine ring has an envelope conformation with the spiro C atom, shared with the indoline ring system, as the flap. The mean planes of the benzothiophene and indoline ring systems are inclined to the mean plane
M. P. Savithri, M. Suresh, R. Raghunathan, R. Raja, A. SubbiahPandi   +4 more
doaj   +1 more source

Crystal structure and Hirshfeld surface analysis of 4′-(2-chlorophenyl)-1′-methyl-3′′-phenyl-7′′,8′′-dihydro-5′′H-dispiro[indoline-3,2′-pyrrolidine-3′,6′′-isoquinoline]-2,5′′-dione

Acta Crystallographica Section E: Crystallographic Communications, 2018
In the title dispiro compound, C32H26ClN3O2, the cyclohexanone ring of the isoquinoline unit has a distorted envelope conformation, with the methylene C atom adjacent to the spiro C atom as the flap.
R. Vishnupriya, C. Selva Meenatchi, J. Suresh, R. V. Sumesh, R. Ranjith Kumar, P. L. Nilantha Lakshman   +5 more
doaj   +1 more source

The Diarylprolinol Silyl Ethers: After 20 Years Still Opening New Doors in Asymmetric Catalysis

Angewandte Chemie, Volume 138, Issue 11, 9 March 2026.
Catalysis Rules! The year 2025 marks the 20th anniversary of diarylprolinol silyl ethers in asymmetric organocatalysis. During the first decade after their discovery, these catalysts have been established as one of the most versatile tools in aminocatalysis. Although now considered mature, recent years have witnessed renewed innovation.
Enrico Marcantonio, René Slot Bitsch, Karl Anker Jørgensen   +2 more
wiley   +2 more sources

Langgestreckte Moleküle von Dispiro[5.1.5.2]‐Typ

Chemische Berichte, 1992
Rod‐Like Dispiro[5.1.5.2] CompoundsA number of symmetrically and unsymmetrically substituted spiro compounds were synthesized starting from the dispiro[5.1.5.2]trione 1. The trans‐trans isomers of 2, 3, 6–10, and 11 were separated from the cis‐cis and cis‐trans isomers.
Vögtle, F., Hartmann, R., Boettcher, J.
openaire   +2 more sources

Development of spiro-3-indolin-2-one containing compounds of antiproliferative and anti-SARS-CoV-2 properties

Scientific Reports, 2022
A series of 1″-(alkylsulfonyl)-dispiro[indoline-3,2′-pyrrolidine-3′,3″-piperidine]-2,4″-diones 6a‒o has been synthesized through regioselective multi-component azomethine dipolar cycloaddition reaction of 1-(alkylsulfonyl)-3,5-bis(ylidene)-piperidin-4 ...
Nehmedo G. Fawazy, Siva S. Panda, Ahmed Mostafa, Benson M. Kariuki, Mohamed S. Bekheit, Yassmin Moatasim, Omnia Kutkat, Walid Fayad, May A. El-Manawaty, Ahmed A. F. Soliman, Riham A. El-Shiekh, Aladdin M. Srour, Reham F. Barghash, Adel S. Girgis   +13 more
doaj   +1 more source

An effective one-pot access to polynuclear dispiroheterocyclic structures comprising pyrrolidinyloxindole and imidazothiazolotriazine moieties via a 1,3-dipolar cycloaddition strategy

Beilstein Journal of Organic Chemistry, 2016
An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles ...
Alexei N. Izmest’ev, Galina A. Gazieva, Natalya V. Sigay, Sergei A. Serkov, Valentina A. Karnoukhova, Vadim V. Kachala, Alexander S. Shashkov, Igor E. Zanin, Angelina N. Kravchenko, Nina N. Makhova   +9 more
doaj   +1 more source

Dispiro[fluorene-9,5′-[1,2,3,4]tetrathiane-6′,9′′-fluorene] [PDF]

Acta Crystallographica Section C Crystal Structure Communications, 2001
The tetrathiane ring of the title compound, C26H16S4, has a chair conformation and the molecule has approximate C2 symmetry. Each of the two fluorene ring systems is virtually planar, with the ring planes intersecting at an angle of 67.58 (5)°. This novel compound has been formed as a side product from the treatment of 9H-fluorene-9-thione with methyl ...
Linden, Anthony, Gebert, Andreas, Heimgartner, Heinz   +2 more
openaire   +4 more sources

Synthesis of 1-azaspiro[4.4]nonan-1-oxyls via intramolecular 1,3-dipolar cycloaddition

Beilstein Journal of Organic Chemistry, 2019
Sterically shielded nitroxides of the pyrrolidine series have shown the highest resistance to reduction. Here we report the synthesis of new pyrrolidine nitroxides from 5,5-dialkyl-1-pyrroline N-oxides via the introduction of a pent-4-enyl group to the ...
Yulia V. Khoroshunova, Denis A. Morozov, Andrey I. Taratayko, Polina D. Gladkikh, Yuri I. Glazachev, Igor A. Kirilyuk   +5 more
doaj   +1 more source