Results 11 to 20 of about 5,513 (178)

TADF-Active Tetrazole Luminophores for Visible-Light Functionalization of Nanoparticles and Surfaces. [PDF]

Angew Chem Int Ed Engl
A series of tetrazoles are reported that undergo 1,3‐dipolar cycloadditions with alkene and alkyne substrates, generating (dihydro)pyrazole products that exhibit thermally activated delayed fluorescence (TADF). The “photo‐click” reactivity of these tetrazoles is leveraged to functionalize nanoparticles and surfaces with TADF‐active chromophores ...
Hojo R, Bergmann K, Xie SL, Durfy CS, Primrose WL, Gogoulis AT, Elgadi SA, Demchuk MJ, Kalab T, Hu P, Nichols EM, Hudson ZM.   +11 more
europepmc   +3 more sources

A de-novo Approach Towards Divergent [3+2π/σ] Photocycloadditions of Nitrones via Assembly-Controlled Kinetic Electron Transfer Gating. [PDF]

Angew Chem Int Ed Engl
A metal‐free photocatalytic platform converts nitrones into 4‐isoxazolines and oxa–aza–bicycloheptanes through divergent [3+2π/σ] cycloadditions. Assembly‐controlled kinetic electron transfer gating dictates substrate activation, enabling selective reactivity beyond thermodynamic expectations.
Saha N, Kancherla R, Escorihuela J, Chandran S, Bera MK, Rueping M, König B.   +6 more
europepmc   +3 more sources

Lewis Acid-Catalyzed Strain-Enabled (3+3) Annulation of Bicyclo[1.1.0]Butanes With Indolylalcohols: Synthesis of Indole-Fused Aza-Bicyclo[3.1.1]Heptanes. [PDF]

Adv Sci (Weinh)
Bicyclo[1.1.0]butanes undergo a Lewis acid‐catalyzed formal (3 + 3) annulation with indolyl alcohols to furnish indole‐fused aza‐bicyclo[3.1.1]heptanes. Strain‐release‐driven C‐C bond formation, followed by C‐N bond formation via ring expansion, enables the rapid assembly of rigid, sp3‐rich bicyclic architectures under mild reaction conditions ...
Dey M, Mahapatra TSD, Sharma P, Mane MV, Hazra CK.   +4 more
europepmc   +2 more sources

1, 3-Dipolar Cycloadditions. LXXVI. Cycloadditions of Diazomethane to Substituted Butadienes

Chemical and Pharmaceutical Bulletin, 1975
1-Substituted butadienes (R=CH2, CH3, O, C3H5, CO2CH3, CN) and 2-phenylbutadiene accept diazomethane at the 3, 4-bond yielding 3-vinylpyrazoline derivatives. Tautomerization of the 1-to 2-pyrazolines takes place either at room temperature (R=CO2CH3, CN), on heating (R=C6H5) or on acid catalysis (R=H, CH3, OCH3) ; the 2-pyrazolines are characterized as ...
HUISGEN, ROLF, OHTA, AKIHIRO, GEITTNER, JOCHEN   +2 more
openaire   +2 more sources

Synthesis of novel pyrazoles via [2+3]-dipolar cycloaddition using alkyne surrogates [PDF]

Tetrahedron Letters, 2010
The syntheses of an important class of hitherto unreported novel pyrazoles are described. The regioselective synthesis of 1,3,4,5-tetrasubstituted pyrazoles was achieved by the Huisgen cyclization of nitrile imines with a trisubstituted bromoalkene. The substituted bromoalkene functions as an alkyne synthon which was used to construct 5,5-disubstituted
Sureshbabu, Dadiboyena, Edward J, Valente, Ashton T, Hamme   +2 more
openaire   +2 more sources

Dimerization of propargyl and homopropargyl 6-azido-6-deoxy-glycosides upon 1,3-dipolar cycloaddition

Beilstein Journal of Organic Chemistry, 2008
Copper-catalyzed, thermal or microwave promoted 1,3-dipolar cycloaddition (Click Reaction) of 2-propynyl and 3-butynyl 2,3,4-tri-O-acetyl-6-azido-6-deoxy-glycopyranosides in the D-gluco, D-galacto and D-manno series afford the corresponding dimeric ...
Nikolas Pietrzik, Daniel Schmollinger, Thomas Ziegler   +2 more
doaj   +1 more source

Side-chain Modifications of Highly Functionalized 3(2H)-Furanones

Molecules, 2012
A series of 3(2H)-furanones, based on side-chain modifications of a parent 3(2H)-furanone, was synthesized in good yield. The parent compound was prepared by hydrogenolysis, and subsequent acid hydrolysis, of isoxazole derivatives.
Gil Valdo José da Silva, Maurício Gomes Constantino, Viviani Nardini, Shirley Muniz Machado Rodrigues   +3 more
doaj   +1 more source

Domino Multicomponent Approach for the Synthesis of Functionalized Spiro-Indeno[1,2-b]quinoxaline Heterocyclic Hybrids and Their Antimicrobial Activity, Synergistic Effect and Molecular Docking Simulation

Molecules, 2019
An expedient synthesis of hitherto unexplored novel hybrid heterocycles comprising dispiropyrrolidine, N-styrylpiperidone and indeno[1,2-b]quinoxaline units has been developed via domino multicomponent 1,3-dipolar cycloaddition strategy employing a new ...
Abdulrahman I. Almansour, Natarajan Arumugam, Raju Suresh Kumar, Dhaifallah M. Al-thamili, Govindasami Periyasami, Karuppiah Ponmurugan, Naif Abdullah Al-Dhabi, Karthikeyan Perumal, Dhanaraj Premnath   +8 more
doaj   +1 more source

Diastereoselective Formal 1,3-Dipolar Cycloaddition of Trifluoroethyl Amine-Derived Ketimines Enables the Desymmetrization of Cyclopentenediones

Molecules, 2023
In this research, a metal-free diastereoselective formal 1,3-dipolar cycloaddition of N-2,2,2-trifluoroethylisatin ketimines and cyclopentene-1,3-diones which can efficiently lead to the desymmetrization of cyclopentene-1,3-diones is developed.
Lin-Qiang Li, Jian-Qiang Zhao, Yan-Ping Zhang, Yong You, Zhen-Hua Wang, Zhen-Zhen Ge, Ming-Qiang Zhou, Wei-Cheng Yuan   +7 more
doaj   +1 more source

The 1,3-dipolar cycloaddition of 1-methylphthalazinium ylides to non-symmetrically activated alkynes on a solid support under microwave irradiation [PDF]

Journal of the Serbian Chemical Society, 2006
In this paper, a comparative study of the reaction of 1-methylpihthalazinium ylides with nonsymmetrically activated alkynes in a solid media by classical heating and under microwaves is presented.
IONEL MANGALAGIU, GHEORGHITA ZBANGIOC, STEFAN DIMA   +2 more
doaj   +3 more sources