Results 51 to 60 of about 14,648 (255)

In Silico and In Vitro Assessment of Antimicrobial and Antibiofilm Activity of Some 1,3-Oxazole-Based Compounds and Their Isosteric Analogues

Applied Sciences, 2022
In this paper, we report on the antimicrobial activity assessment of 49 compounds previously synthesized as derivatives of alanine or phenylalanine that incorporate a 4-(4-X-phenylsulfonyl)phenyl fragment (X = H, Cl, or Br), namely 21 acyclic compounds ...
Theodora-Venera Apostol, Mariana Carmen Chifiriuc, George Mihai Nitulescu, Octavian Tudorel Olaru, Stefania-Felicia Barbuceanu, Laura-Ileana Socea, Elena Mihaela Pahontu, Crina Maria Karmezan, Luminita Gabriela Marutescu   +8 more
doaj   +1 more source

Formal Carbene C-H Bond Insertion in the Cu(I)-Catalyzed Reaction of Bis(trimethylsilyl)diazomethane with Benzoxazoles and Oxazoles.

Organic Letters, 2019
A Cu(I)-catalyzed cross-coupling reaction of bis(trimethylsilyl)diazomethane and benzoxazoles/oxazoles is reported. A wide range of functional groups can be tolerated in this transformation. This reaction provides a new method to directly introduce a 1,1-
Shuai Wang, Shuai Xu, Cheng Yang, Han-zhou Sun, J. Wang   +4 more
semanticscholar   +1 more source

Synthesis of Oxazoles Containing CF₃-Substituted Alcohol Unit via Tandem Cycloisomerization/Hydroxyalkylation from N-Propargylamides with Trifluoropyruvates

Molecules
Oxazoles are important five-membered heterocycles that contain both nitrogen and oxygen atoms. Due to their wide range of biological activities, many oxazoles demonstrate potential for extensive application in various fields, including medicinal ...
Juan-Juan Gao, Long-Hui Wu, Shu-Qin Yu, Xue Zhu, Yu Zeng, Kai Yang, Zhao-Yang Wang   +6 more
doaj   +1 more source

Singlet Oxygen Photooxidation of Peptidic Oxazoles and Thiazoles.

Journal of Organic Chemistry, 2019
Oxazoles and thiazoles are commonly found moieties in nonribosomal peptides (NRPs) and ribosomally synthesized post-translationally modified peptides (RiPPs), which are important biomolecules present in the environment and in natural waters.
A. Manfrin, Nadine Borduas-Dedekind, K. Lau, K. McNeill   +3 more
semanticscholar   +1 more source

Recent Advances on O-Ethoxycarbonyl and O-Acyl Protected Cyanohydrins

Molecules, 2021
Ethoxycarbonyl cyanohydrins and O-acyl cyanohydrins are examples of O-protected cyanohydrins in which the protecting group presents an electrophilic center, contributing to additional reaction pathways.
Héctor Manuel Torres Domínguez, Luis Mauricio Hernández Villaverde, Ronan Le Lagadec   +2 more
doaj   +1 more source

Dual Lewis Acid Promoted/Visible Light Driven Preparation of Aryl Diazenyl Oxazoles from Isocyanoacetamides and Arylazo Sulfones

Advanced Synthesis &Catalysis, Volume 367, Issue 5, March 4, 2025.
Abstract While arylazo sulfones have been widely applied as arylating agents, their exploitation for diazenylation reactions has been previously limited to electron‐rich alkenes such as styrenes and silyl enol ethers. Herein we optimized a synthetic one‐pot protocol to access oxazolyl azo compounds via a selective domino ring‐closing/aryldiazenylation ...
Enzo Delalande, Lorenzo di Terlizzi, Camilla Russo, Carmine Volpe, Stefano Protti, Mariateresa Giustiniano   +5 more
wiley   +1 more source

Total synthesis of the post-translationally modified polyazole peptide antibiotic plantazolicin A [PDF]

, 2015
The power of rhodium carbene methodology in chemistry is demonstrated by the synthesis of a structurally complex polyazole antibiotic. Plantazolicin A, a novel soil bacterium metabolite, comprises a linear array of 10 five-membered rings in two ...
Moody, Christopher J., Wada, Hiroki, Williams, Huw E. L.   +2 more
core   +2 more sources

Identification and isolation of insecticidal oxazoles from Pseudomonas spp.

Beilstein Journal of Organic Chemistry, 2012
Two new and five known oxazoles were identified from two different Pseudomonas strains in addition to the known pyrones pseudopyronine A and B. Labeling experiments confirmed their structures and gave initial evidence for a novel biosynthesis pathway of ...
Florian Grundmann, Veronika Dill, Andrea Dowling, Aunchalee Thanwisai, Edna Bode, Narisara Chantratita, Richard ffrench-Constant, Helge B. Bode   +7 more
doaj   +1 more source

Componentes voláteis do café torrado. Parte I: compostos heterocíclicos Volatile components in roasted coffee. Part I: heterocyclic compounds

Química Nova, 1999
A review of heterocyclic compounds in roasted coffee is presented. The contents, precursors and sensorial properties of furans, pyrroles, oxazoles, thiazoles, thiophenes, pyrazines and pyridines are discussed.
Carlos Alberto Bastos De Maria, Ricardo Felipe Alves Moreira, Luiz Carlos Trugo   +2 more
doaj   +1 more source

Diradicalar Character and Ring Stability of Mesoionic Heterocyclic Oxazoles and Thiazoles by Ab Initio Mono and Multi-Reference Methods

Molecules, 2020
Mesoionics are neutral compounds that cannot be represented by a fully covalent or purely ionic structure. Among the possible mesomeric structures of these compounds are the diradical electronic configurations.
Antonio João da Silva Filho, Lucinêz da Cruz Dantas, Otávio Luís de Santana   +2 more
doaj   +1 more source