Results 41 to 50 of about 12,662 (287)

Chiral Cyclopentadienyl Ruthenium Complexes as Versatile Catalysts for Enantioselective Transformations

CHIMIA, 2017
Ruthenium complexes, in particular cyclopentadienyl ruthenium (??) derivatives, catalyze a vast number of transformations in the field of homogenous catalysis.
David Kossler, Nicolai Cramer
doaj   +1 more source

Metal-mediated intramolecular hydroamination and hydro(acy)alkoxylation reactions [PDF]

, 2012
This PhD thesis describes work undertaken to effect asymmetric catalysis in hydroamination and hydro(acy)alkoxylation reactions of allenes. The introductory Chapter provides an overview of recent advances in asymmetric heterofunctionalisation reactions ...
Arbour, Jannine Louise, Arbour, Jannine Louise   +1 more
core   +1 more source

[DMImd-DMP]: A highly efficient and reusable catalyst for the synthesis of 4H-benzo[b]pyran derivatives

Heterocyclic Communications, 2019
A series of substituted 4H-pyrans derivatives were synthesized by a one-pot, multi-component reaction of aromatic aldehydes, malononitrile, and pyrazolone derivatives or active methylene carbonyl compounds such as dimedone, in the presence of 1,3 ...
Redouane Mohamed Abdenour, Khiri-Meribout Naima, Benzerka Saida, Debache Abdelmadjid   +3 more
doaj   +1 more source

Synthesis of Fe3O4@SiO2@Pr-NH2@DAP as a magnetic recyclable nano-catalyst for efficient synthesis of pyranothiazolopyrimidines and 4H-pyrans under solvent-free condition

Scientific Reports, 2023
In this research, we describe the synthesis of silica-coated nano-Fe3O4 particles, which were successfully modified by diaminopyrimidine, and their physicochemical properties were characterized using FT-IR, XRD, TEM, FE-SEM, EDX, EDX-mapping, and TGA ...
Maryam Danehchin, Abbas Ali Esmaeili
doaj   +1 more source

2-(2-(Dimethylamino)vinyl)-4H-pyran-4-ones as Novel and Convenient Building-Blocks for the Synthesis of Conjugated 4-Pyrone Derivatives

Molecules, 2022
A straightforward approach for the construction of the new class of conjugated pyrans based on enamination of 2-methyl-4-pyrones with DMF-DMA was developed.
Dmitrii L. Obydennov, Diana I. Nigamatova, Alexander S. Shirinkin, Oleg E. Melnikov, Vladislav V. Fedin, Sergey A. Usachev, Alena E. Simbirtseva, Mikhail Y. Kornev, Vyacheslav Y. Sosnovskikh   +8 more
doaj   +1 more source

Recent Advances in the Synthesis of 2H-Pyrans

Molecules, 2019
In this review, we discuss the nature of the different physicochemical factors affecting the valence isomerism between 2H-pyrans (2HPs) and 1-oxatrienes, and we describe the most versatile synthetic methods reported in recent literature to access to 2HPs,
David Tejedor, Samuel Delgado-Hernández, Raquel Diana-Rivero, Abián Díaz-Díaz, Fernando García-Tellado   +4 more
doaj   +1 more source

Silver and platinum-catalysed addition of O–H and N–H bonds to allenes [PDF]

, 2014
Transition-metal catalysed nucleophile addition to allenes is a very powerful tool for the synthesis of functionalised molecules containing heteroatoms, heterocycles in the intramolecular version, or allyl derivatives in the intermolecular version.
Munoz-Herranz, Maria
core   +1 more source

Macrophage Membrane‐Cloaked, ROS‐Triggered Quercetin Nanocarriers Target Ovarian Lesions to Treat Polycystic Ovary Syndrome

Advanced Healthcare Materials, EarlyView.
The synthesis process of MM@PCD@QNPs and its potential mechanism for treating PCOS. (A) Assembly steps of MM@PCD@QNPs. (B) Synthesis and decomposition of MM@PCD@QNPs. (C) Potential therapeutic mechanisms of MM@PCD@QNPs for PCOS. PCD, PABP conjugated with DEX polymer; QUR, quercetin; CDI, N, N′‐carbonyldiimidazole; DEX, dextran; PABP, 4‐(hydroxymethyl ...
Wenzhu Li, Yu Guan, Nan Song, Feng Zhang, Zhimin Deng, Tailang Yin, Yanbing Yang, João Conde, Wenyi Jin, Zhinang Yin   +9 more
wiley   +1 more source

Synthesis of novel photochromic pyrans via palladium-mediated reactions

Beilstein Journal of Organic Chemistry, 2009
Photochromic pyrans for applications in material and life sciences were synthesized via palladium-mediated cyanation, carbonylation and Sonogashira cross-coupling starting from bromo-substituted naphthopyran 1 and benzopyrans 2a/b.
Christoph Böttcher, Gehad Zeyat, Saleh A. Ahmed, Elisabeth Irran, Thorben Cordes, Cord Elsner, Wolfgang Zinth, Karola Rueck-Braun   +7 more
doaj   +1 more source

Magnetic silica/graphene oxide nanocomposite supported ionic liquid–manganese complex as a powerful catalyst for the synthesis of tetrahydrobenzopyrans

Scientific Reports, 2023
A novel magnetic silica/graphene oxide nanocomposite supported ionic liquid/manganese complex (Fe3O4@SiO2-NH2/GO/IL-Mn) is prepared, characterized and its catalytic application is investigated.
Farkhondeh Dadvar, Dawood Elhamifar
doaj   +1 more source