Results 71 to 80 of about 13,198 (167)

Asymmetric Transformations of α,β‐Unsaturated Oxazolidinones Catalyzed by C2‐Symmetric Chiral Iron Triad Complexes

Advanced Synthesis &Catalysis, Volume 368, Issue 9, 5 May 2026.
This review highlights the evolution of highly enantioselective oxazolidinone transformations enabled by C2‐symmetric ligands, with emphasis on chiral iron triad complexes as cost‐effective, environmentally benign alternatives to late‐transition‐metal catalysts.
Arthur David, Thierry Ollevier
wiley   +1 more source

1,3-Dipolar Cycloaddition Reactions of Porphyrins with Azomethine Ylides^†

, 2016
The behavior of porphyrins as dipolarophiles in 1,3-dipolar cycloadditions with azomethine ylides was studied. Depending on the nature of the substituent groups on the porphyrin macrocycles, the reaction can give monoadducts (chlorins) or bisadducts ...
José A. S. Cavaleiro (349731), Augusto C. Tomé, (2689519), Artur M. S. Silva (1577557), Ana M. G. Silva (1668895), Maria G. P. M. S. Neves (349727)   +4 more
core   +1 more source

Copper‐ and Silver‐Catalyzed Reactions of Active Methylene Isocyanides: Facile Access to Highly Substituted Five‐ and Six‐Membered Heterocycles

Chemistry – A European Journal, Volume 32, Issue 13, 1 April 2026.
This review summarizes recent advances in copper‐ and silver‐catalyzed reactions of active methylene isocyanides for the synthesis of highly substituted five‐ and six‐membered heterocycles. Emphasis is placed on [3+n] cycloadditions, annulations, and asymmetric strategies, highlighting current limitations and future opportunities in heterocycle ...
Jimil George, Kyungsoo Oh
wiley   +1 more source

First 1,3-Dipolar Cycloaddition of Azomethine Ylides With (E)-Ethyl 3-Fluoroacrylate. Regio- and Stereoselective Synthesis of Enantiopure Fluorinated Prolines.

, 2006
Enantiopure fluorinated prolines with four chiral centers were obtained from 1,3-dipolar cycloaddition of azomethine ylides and (E)-ethyl 3 ...
Boschi, Francesca, Bianca Flavia Bonini, BONINI, BIANCA FLAVIA, Fochi, Mariafrancesca, Alfredo Ricci, Mariafrancesca Fochi, Andrea Mazzanti, Mauro Comes Franchini, FINI, Francesco, Francesco Fini, Comes Franchini, Mauro, RICCI, ALFREDO MARCO, Francesca Boschi, Ricci, Alfredo, Mazzanti, Andrea, Bonini, Bianca F.   +15 more
core   +1 more source

A Facile One-Pot Construction of Succinimide-Fused Spiro[Pyrrolidine-2,3′-Oxindoles] via 1,3-Dipolar Cycloaddition Involving 3-Amino Oxindoles and Maleimides

Molecules, 2018
Increasing interests have been invested in the development of synthetic strategies toward the construction of spiro[pyrrolidine-2,3′-oxindole], which is the core structural skeleton in some compounds with diverse biological activities.
Lunqiang Jin, Feng Liang
doaj   +1 more source

Heat‐Induced Toxicants: Sensory Appeal Distracts Consumers' Attention From Potential Toxicological Risks of Thermally Processed Foods

Food Science &Nutrition, Volume 14, Issue 4, April 2026.
The central paradox of thermal processing of foods. (A) The application of heat (e.g., frying, baking, grilling) to food initiates complex chemical reactions, most notably the Maillard reaction and thermal degradation of protein, lipids, and carbohydrate. (B) These reactions create a desirable sensory experience characterized by enticing aromas, golden‐
Joachim Dotto Matondo, Abdulsudi Issa‐Zacharia   +1 more
wiley   +1 more source

Catalytic asymmetric construction of spiropyrrolidines via 1,3-dipolar cycloaddition of azomethine ylides

, 2018
In this review, recent progress on the catalytic enantioselective synthesis of chiral spiropyrrolidine derivatives via 1,3-dipolar cycloaddition of azomethine ylides has been discussed.
Fang, Xin, Wang, Chun Jiang, Xin Fang, Chun-Jiang Wang   +3 more
core   +1 more source

Bis‐Furans: A Sustainable Source of Diverse Molecular Architectures

European Journal of Organic Chemistry, Volume 29, Issue 10, 9 March 2026.
A concise synthetic route to diverse acyclic and heterocyclic compounds has been developed by combining hetero‐Diels–Alder reactions, DBU‐promoted ring openings, and Lewis base‐catalyzed annulations. Nitrosoalkenes reacted with furan derivatives to form 4a,7a‐dihydro‐4H‐furo[2,3‐e][1,2]oxazines, which underwent DBU‐promoted rearrangements to 6H‐1,2 ...
Ana L. Cardoso, José A. Paixão, Teresa M. V. D. Pinho e Melo   +2 more
wiley   +1 more source

Highly Enantioselective Ag(I)-Catalyzed [3 + 2] Cycloaddition of Azomethine Ylides

, 2016
A highly reactive Ag(I)-catalyzed [3 + 2] cycloaddition of azomethine ylides is founded using AgOAc as the catalytic precursor and phosphines as ligands.
Xumu Zhang (1447558), James M. Longmire (2989365), Bin Wang (30851)   +2 more
core   +1 more source

Stereocontrolled 1,3-dipolar cycloadditions using Oppolzer's camphor sultam as the chiral auxiliary for carbonyl stabilized azomethine ylides

, 2001
Two complementary approaches to substituted pyrrolidines via stereocontrolled 1,3-dipolar cycloaddition reactions of chiral azomethine ylides are described.
Wiley J. Youngs, John Protasiewicz, Rebecca Zaniewski, Philip Garner, Özdemir Dogan, Vance O. Kennedy, Vance, Kennedy, Doğan, Özdemir, Garner, Philip, Protasiewicz, John, Zaniewski, Rebecca, Youngs, Wiley   +11 more
core   +1 more source