Results 101 to 110 of about 24,842 (217)

A Systematic Review of Synthetic and Anticancer and Antimicrobial Activity of Quinazoline/Quinazolin‐4‐one Analogues

ChemistryOpen, EarlyView.
Quinazoline represents an important class of heterocycles with diverse medicinal and pharmacological significance. This review systematically examines scholarly efforts toward understanding different synthetic pathways emphasizing the role of metal and non‐metal catalysts including some miscellaneous reagents employed in the synthesis of quinazoline ...
Neha Manhas, Gobind Kumar, Sanjeev Dhawan, Talent Makhanya, Parvesh Singh   +4 more
wiley   +1 more source

Stereoselective Ag-Catalyzed 1,3-Dipolar Cycloaddition of Activated Trifluoromethyl-Substituted Azomethine Ylides.

Chemistry, 2016
A silver-catalyzed 1,3-dipolar cycloaddition of fluorinated azomethine ylides and activated olefins is reported. The reaction offers a straightforward and atom-economical procedure for the preparation of fluorinated pyrrolidines.
Alberto Ponce, I. Alonso, J. Adrio, J. Carretero   +3 more
semanticscholar   +1 more source

Highly Regioselective 1,3-Dipolar Cycloaddition of Nitrilimines and Thioaurones Towards Spiro-2-Pyrazolines: Synthesis, Characterization, and Mechanistic Study

Reactions
In this paper, we report a highly regioselective 1,3-dipolar cycloaddition (1,3-DC) reaction of nitrilimines with thioaurone derivatives that afforded the hitherto unreported spiropyrazolines. Spectroscopic and spectrometric data were utilized to confirm
Mohamed Bakhouch, Bouchra Es-Sounni, Ayoub Ouaddi, Khaoula Oudghiri, Mohammed Chalkha, Lahoucine Bahsis, Taoufiq Benali, Mohamed Bourass, Rabiaa Fdil, Mohamed Akhazzane, Mohamed El Yazidi   +10 more
doaj   +1 more source

Synthesis and Characterization of some New Mesoionic 1,3-Thiazolium-5-thiolates via Cyclodehydration and in situ 1,3-Dipolar Cycloaddition/Cycloreversion

Molecules, 2002
The title compounds were synthesized from C-aryl-N-methylglycines by Naroylation followed by a cyclodehydration to form the corresponding 1,3-oxazolium-5-olates.
Maria Joaquina Vieira, Aderson de Farias Dias, Alfredo Mayall Simas, Joseph Miller, Petrônio Filgueiras de Athayde Filho, Bruno Freitas Lira   +5 more
doaj   +1 more source

Controlling Drug Release From Supramolecular Polymer Surfaces by a Click‐To‐Release Reaction

Journal of Polymer Science, EarlyView.
We present a strategy combining reactive supramolecular additives with a covalent click‐to‐release reaction for localized drug delivery. A trans‐cyclooctene additive releases a cytotoxic drug upon tetrazine administration. Fluorescent monitoring confirms release, and cytotoxic tests show effective cancer cell death.
Maritza M. Rovers, Joyce E. P. Brouns, Fenna W. B. Craenmehr, Marc Robillard, Joris W. Peeters, Henk M. Janssen, Patricia Y. W. Dankers   +6 more
wiley   +1 more source

Diethyl 4-acetyl-5-(2-nitrophenyl)pyrrolidine-2,2-dicarboxylate

Acta Crystallographica Section E, 2010
The title compound, C18H22N2O7, was synthesized by the 1,3-dipolar cycloaddition reaction of but-3-en-2-one, diethyl 2-aminomalonate and 2-nitrobenzaldehyde. In the molecule, the pyrrolidine ring possesses an envelope conformation.
Long He
doaj   +1 more source

Fluorescent Antibiotics: Bridging Diagnostic and Therapy in the Fight against Bacterial Infections

Small Science, EarlyView.
This review critically evaluates fluorescent antibiotics as promising agents combining diagnostic precision with therapeutic efficacy. It highlights advances in probe design, chemical conjugation strategies, real‐time imaging applications, selective pathogen detection, and targeted therapy. The potential to combat antimicrobial resistance is discussed,
Tan Phuoc Ton, Richard Bright, Vi Khanh Truong, Krasimir Vasilev   +3 more
wiley   +1 more source

Visible-Light-Mediated Anti-Regioselective Nitrone 1,3-Dipolar Cycloaddition Reaction and Synthesis of Bisindolylmethanes.

Organic Letters, 2017
The development of photoredox reactions of 1,3-dipolar cycloaddition of nitrones with alkenes is reported. It offers an efficient synthetic method to obtain isoxazolidine derivatives under mild conditions in synthetically useful yields.
Lewei Zheng, Fei Gao, C. Yang, Guo-Lin Gao, Yating Zhao, Yuan Gao, W. Xia   +6 more
semanticscholar   +1 more source

Synthesis of highly functionalized β-aminocyclopentanecarboxylate stereoisomers by reductive ring opening reaction of isoxazolines

Beilstein Journal of Organic Chemistry, 2012
A rapid and simple procedure was devised for the synthesis of multifunctionalized cyclic β-amino esters and γ-amino alcohols via the 1,3-dipolar cycloaddition of nitrile oxides to β-aminocyclopentenecarboxylates.
Melinda Nonn, Loránd Kiss, Reijo Sillanpää, Ferenc Fülöp   +3 more
doaj   +1 more source

Development and pharmacological characterization of novel multi‐ calcitonin gene‐related peptide and pituitary adenylate cyclase‐activating peptide receptor antagonists

Headache: The Journal of Head and Face Pain, EarlyView.
Abstract Objective This study aimed to provide proof‐of‐concept that multi‐receptor antagonist peptides can be generated by covalently linking independent antagonist peptides that block calcitonin gene‐related peptide (CGRP8‐37) or pituitary adenylate cyclase‐activating peptide (PACAP)/vasoactive intestinal peptide (VIP) (PACAP6‐38) activity ...
Zoe Tasma, Andrew Siow, Paul W. R. Harris, Margaret A. Brimble, Debbie L. Hay, Christopher S. Walker   +5 more
wiley   +1 more source