Results 41 to 50 of about 2,914 (164)

Direct Chemoselective Synthesis of N-3-Substituted Pyrimidinones in a Microwave-Assisted Method

, 2015
Synthesis of selectively N-3-substituted pyrimidine nucleobases or pyrimidinones has always been a challenge because of poor regioselectivity and chemoselectivity.
Burgula Laxminarayana (695636), Lal Mohan Kundu (695637)   +1 more
core   +1 more source

Electron impact ionization mass spectra of some substituted dipyrido[1,2-a:4,3-d]pyrimidinones

, 1993
The electron impact ionization mass spectra of dipyrido [1,2-a:4,3-d] pyrimidinones are strongly influenced by the degree of aromaticity of the fused rings. The molecular ions of the compounds are fairly stable.
Huber Imre, Maki Esa, Fülöp Ferenc, Bernáth Gábor, Pihlaja Kalevi, Vainiotalo Pirjo   +5 more
core   +2 more sources

Efficient synthesis, reactions and spectral characterization of pyrazolo[4’,3’:4,5]thieno[3,2-d] pyrimidines and related heterocycles

Heterocyclic Communications, 2019
New pyrazolothienopyrimidines were synthesized. The key intermediate 4-aminothieno[2,3-c]pyrazole-5-carbonitrile 1 was converted to the chloroacetyl amino derivative 2 followed by nucleophilic substitution and Dimorth rearrangement upon treatment with ...
Zaki Remon M., Kamal El-Dean Adel M., Radwan Shaban M., Saber Ahmed F.   +3 more
doaj   +1 more source

The role of phosphotungstic acid in enhancing the catalytic performance of UiO-66 (Zr) and its applications as an efficient solid acid catalyst for coumarins and dihydropyrimidinones synthesis

Catalysis Communications, 2022
In recent study, we report a facile and easy technique for the synthesis phosphotungstic acid (PTA) with different weight contents (10, 25, 50 and 75 wt%) loaded on UiO-66 (Zr) as efficient and reusable catalysts for the preparation of coumarin and ...
Fares T. Alshorifi, Dina E. Tobbala, Salah M. El-Bahy, Mohamed A. Nassan, Reda S. Salama   +4 more
doaj   +1 more source

Self‐Healing UPy‐Functionalized Polyethylene Networks: A Robust Platform for Resilient and High‐Performance Lithium Battery Separators

Advanced Science, EarlyView.
Self‐healing separators are developed by grafting ureidopyrimidinone (UPy) quadruple hydrogen‐bonding motifs onto PE‐HEMA copolymers, blended with high‐MW PEO via solvent‐free hot‐pressing. The dynamic UPy network enables autonomous healing, restoring functionality after short circuits.
Daniele Callegari, Arkadiusz Zych, Roberta Pinalli, Enrico Dalcanale, Eliana Quartarone   +4 more
wiley   +1 more source

A domino Microwave-assisted protocol for the Synthesis of 2,6 Disubstituted Pyrimidinones

, 2011
A practical microwave-assisted protocol for the synthesis of 2,6-disubstituted pyrimidinones has been developed. This approach is based on a domino Michael addition-cyclocondensation reaction between substituted thioureas/guanidines and ...
RADI, Marco, Botta, Maurizio, Casaluce, Gianni, Gianni Casaluce, Maurizio Botta, Marco Radi, Botta, M.   +6 more
core   +1 more source

A Review on Five and Six-Membered Heterocyclic Compounds Targeting the Penicillin-Binding Protein 2 (PBP2A) of Methicillin-Resistant Staphylococcus aureus (MRSA)

Molecules, 2023
Staphylococcus aureus is a common human pathogen. Methicillin-resistant Staphylococcus aureus (MRSA) infections pose significant and challenging therapeutic difficulties.
Shraddha S. Ambade, Vivek Kumar Gupta, Ritesh P. Bhole, Pramod B. Khedekar, Rupesh V. Chikhale   +4 more
doaj   +1 more source

A Comprehensive Review on Additive Manufacturing of Smart Components: Technologies, Applications, and Future Scope

Advanced Intelligent Systems, EarlyView.
How can additive manufacturing enable components that sense, adapt, heal, and power themselves? This review synthesizes recent advances in smart functionalities, manufacturing technologies, and intelligent design strategies, revealing a pathway toward fully integrated, autonomous, and multifunctional systems across diverse engineering sectors. Additive
Aiswarya Rony, P. M. Ushasree, Michael Short, Jinoop Arackal Narayanan   +3 more
wiley   +1 more source

Promising antimicrobial agents: Synthetic approaches to novel tricyclic and tetracyclic pyrimidinones with antimicrobial properties

, 2010
New tricyclic pyrimidinone derivatives were obtained from the corresponding thiazolopyrimidinone or hydrazino systems. The annelation of tricyclic hydrazino compound with 1,2,4-triazole and tetrazole moieties gave novel tetracyclic condensed ...
Usama M. Abdul-Raouf, Mark C. Bagley, Sherif, Sherif M., Abdul-Raouf, Usama M., Gaber, Hatem M., Bagley, Mark Christopher, Sherif M. Sherif, Hatem M. Gaber   +7 more
core   +1 more source

Beyond Simple Mimicry: Next‐Generation Geometric Architectures and Future Paradigms in Small‐Molecule and Macrocyclic Peptidomimetics

Angewandte Chemie, Volume 138, Issue 40, 28 September 2026.
Peptide‐to‐Small Molecule Paradigm: Peptidomimetics have evolved from simple mimicry toward drug‐like scaffolds supported by increasing clinical successes. This Perspective highlights the geometric design principles—linear repetition, convergent fusion, and cyclization—defining the next‐generation peptidomimetic architectures capable of targeting ...
Jesang Lee, Sumin Son, Jeong Yeon Yoo, Ji Hyae Lee, Meehyun Chun, Seung Bum Park   +5 more
wiley   +2 more sources