Results 11 to 20 of about 1,749 (157)

The Diarylprolinol Silyl Ethers: After 20 Years Still Opening New Doors in Asymmetric Catalysis. [PDF]

Angew Chem Int Ed Engl
Catalysis Rules! The year 2025 marks the 20th anniversary of diarylprolinol silyl ethers in asymmetric organocatalysis. During the first decade after their discovery, these catalysts have been established as one of the most versatile tools in aminocatalysis. Although now considered mature, recent years have witnessed renewed innovation.
Marcantonio E, Bitsch RS, Jørgensen KA.
europepmc   +3 more sources

Electrochemical Site-Selective Alkylation of Azobenzenes with (Thio)Xanthenes

Molecules, 2022
Herein, we first report an electrochemical methodology for the site-selective alkylation of azobenzenes with (thio)xanthenes in the absence of any transition metal catalyst or external oxidant. A variety of groups are compatible with this electrochemical
Qiang Zhong, Hui Gao, Pei-Long Wang, Chao Zhou, Tao Miao, Hongji Li   +5 more
doaj   +1 more source

ChCl: Gly (DESs) Promote Environmentally Benign Synthesis of Xanthene Derivatives and Their Antitubercular Activity

Molecules, 2021
A ChCl: Gly (DESs) promoted environmentally benign method was developed for the first time using the reaction of aryl aldehydes and dimedone to give excellent yields of xanthene analogues.
Mashooq A. Bhat, Ahmed M. Naglah, Siddique Akber Ansari, Hanaa M. Al-Tuwajiria, Abdullah Al-Dhfyan   +4 more
doaj   +1 more source

The Dual Synergy of Photodynamic and Sonodynamic Therapy in the Eradication of Methicillin-Resistant Staphylococcus aureus

Applied Sciences, 2023
Recently, the combined application of synergistic therapies for photodynamic antimicrobial chemotherapy has become important to obtain more efficient results.
Daniel Ziental, Marcin Wysocki, Maciej Michalak, Jolanta Dlugaszewska, Emre Güzel, Lukasz Sobotta   +5 more
doaj   +1 more source

Synthesis of Cyano-Benzylidene Xanthene Synthons Using a Diprotic Brønsted Acid Catalyst, and Their Application as Efficient Inhibitors of Aluminum Corrosion in Alkaline Solutions

Molecules, 2022
Novel cyano-benzylidene xanthene derivatives were synthesized using one-pot and condensation reactions. A diprotic Brønsted acid (i.e., oxalic acid) was used as an effective catalyst for the promotion of the synthesis process of the new starting xanthene–
Mohammed A. Amin, Gaber A. M. Mersal, Morad M. El-Hendawy, Abdallah A. Shaltout, Ali Badawi, Johan Boman, Adil A. Gobouri, Murat Saracoglu, Fatma Kandemirli, Rabah Boukherroub, Jacek Ryl, Mohamed E. Khalifa   +11 more
doaj   +1 more source

Fe3o4 nanoparticles: A highly efficient and easily reusable catalyst for the one-pot synthesis of xanthene derivatives under solvent-free conditions [PDF]

Journal of the Serbian Chemical Society, 2013
Magnetically separable Fe3O4 nanoparticles supply environmentally friendly procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxo-octahydro-xanthene derivatives.
Ghasemzadeh Ali Mohammad, Safaei-Ghomi Javad, Zahedi Safura   +2 more
doaj   +1 more source

Ag Nanoparticles Stabilized on Cyclodextrin Polymer Decorated with Multi-Nitrogen Atom Containing Polymer: An Efficient Catalyst for the Synthesis of Xanthenes

Molecules, 2020
In attempt to broaden the use of cyclodextrin polymer for catalytic purposes, a novel covalent hybrid system was prepared through growth of multi-nitrogen atom containing polymer (PMelamine) derived from reaction of ethylenediamine and 2,4,6-trichloro-1 ...
Samahe Sadjadi, Fatemeh Ghoreyshi Kahangi, Masoumeh Dorraj, Majid M. Heravi   +3 more
doaj   +1 more source

Nano-Silica Phosphoric Acid: An Efficient Catalyst for One-Pot Synthesis of Tetrahydrobenzo[a]xanthenes-11-one Under Solvent- Free or Sonication Conditions [PDF]

Journal of Nanostructures, 2012
Two simple protocols for the synthesis of tetrahydrobenzo[a]xanthenes-11-ones using nano silica phosphoric acid are reported. Short reaction times, high yields, reusability of catalyst and easy workup are some advantages of these protocols.
A. Bamoniri, S. Nazemian, B. F. Mirjalili   +2 more
doaj   +1 more source

Synthesis of Xanthones, Thioxanthones and Acridones by a Metal-Free Photocatalytic Oxidation Using Visible Light and Molecular Oxygen

Molecules, 2021
9H-Xanthenes, 9H-thioxanthenes and 9,10-dihydroacridines can be easily oxidized to the corresponding xanthones, thioxanthones and acridones, respectively, by a simple photo-oxidation procedure carried out using molecular oxygen as oxidant under the ...
Alejandro Torregrosa-Chinillach, Rafael Chinchilla   +1 more
doaj   +1 more source

Visible light-promoted metal-free aerobic photooxidation of xanthenes, thioxanthenes and dihydroacridines in deep eutectic solvents

Tetrahedron Green Chem, 2023
Benzylic systems such as 9H-xanthenes, 9H-thioxanthenes and 9,10-dihydroacridines can be easily oxidized to the corresponding xanthones, thioxanthones or acridones, respectively, in deep eutectic solvents by a visible blue light-promoted photooxidation ...
Sarah-Jayne Burlingham, Alejandro Torregrosa-Chinillach, Diego A. Alonso, Rafael Chinchilla   +3 more
doaj   +1 more source