Results 21 to 30 of about 13,198 (167)

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

A Convenient Procedure for the Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides and Alkenes

, 2016
Silver fluoride and cinchona alkaloids catalyze the diastereo- and enantioselective 1,3-dipolar cycloaddition between azomethine ylides, generated from N-alkylideneglycine esters, and acrylates to give the corresponding endo-adducts.
Karl Anker Jørgensen (1287900), Gonzalo Blay (1843480), Carlos Alemparte (291057)   +2 more
core   +1 more source

Azomethine Ylides from Tin-Substituted Cyclic Carbinol Amides:  A New Route to Highly Substituted Pyrrolizidines

, 2016
Addition of organolithium and organomagnesium reagents to N-(tri-n-butylstannylmethyl)phthalimides yields N-(tri-n-butylstannylmethyl) cyclic carbinol amides, which form azomethine ylides upon treatment with HF·pyridine.
Amber Dietz (2722279), Patrick Stoy (2698972), William H. Pearson (2490808)   +2 more
core   +2 more sources

Highly Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides Catalyzed by Copper(I)/TF-BiphamPhos Complexes

, 2016
Highly Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides Catalyzed by Copper(I)/TF-BiphamPhos ...
Gang Liang (120372), Feng Gao (3548), Zhi-Yong Xue (1491007), Chun-Jiang Wang (1491001)   +3 more
core   +1 more source

Nontraditional Reactions of Azomethine Ylides: Decarboxylative Three-Component Couplings of α-Amino Acids

, 2016
Nontraditional Reactions of Azomethine Ylides: Decarboxylative Three-Component Couplings of α-Amino ...
Chen Zhang (66790), Daniel Seidel (348104)   +1 more
core   +1 more source

The Photochemistry of N-Iminopyridinium Ylides in Retrospect. From a Simple Concept to Some Applications

CHIMIA, 1991
Azomethine-imines are well known to undergo ground-state 1,3-dipolar cycloaddition reactions with olefins or acetylenes, leading thereby to five-membered heterocyclic systems. When excited by UV light, some of these 1,3-dipolar azomethine-imines
Jacques Streith
doaj   +2 more sources

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

Triethylamine-Promoted Oxidative Cyclodimerization of 2H-Azirine-2-carboxylates to Pyrimidine-4,6-dicarboxylates: Experimental and DFT Study

Molecules, 2023
An unprecedented oxidative cyclodimerization reaction of 2H-azirine-2-carboxylates to pyrimidine-4,6-dicarboxylates under heating with triethylamine in air is described. In this reaction, one azirine molecule undergoes formal cleavage across the C-C bond
Timofei N. Zakharov, Pavel A. Sakharov, Mikhail S. Novikov, Alexander F. Khlebnikov, Nikolai V. Rostovskii   +4 more
doaj   +1 more source

[3 + 2] Cycloaddition of Nonstabilized Azomethine Ylides. 8.^† An Efficient Synthetic Strategy for Epiboxidine

, 2016
[3 + 2] Cycloaddition of Nonstabilized Azomethine Ylides.
Smita R. Gadre (3047760), Trusar D. Bagul (3042567), Akhila K. Sahoo (1479310), Usha D. Phalgune (2485855), Ganesh Pandey (1520503)   +4 more
core   +1 more source

Decarboxylative 1,3-dipolar cycloaddition of amino acids for the synthesis of heterocyclic compounds

Beilstein Journal of Organic Chemistry, 2023
The [3 + 2] cycloadditions of stabilized azomethine ylides (AMYs) derived from amino esters are well-established. However, the reactions of semi-stabilized AMYs generated from decarboxylative condensation of α-amino acids with arylaldehydes are much less
Xiaofeng Zhang, Xiaoming Ma, Wei Zhang
doaj   +1 more source