Results 91 to 100 of about 3,273,294 (390)

Recent advances in catalytic asymmetric synthesis

Frontiers in Chemistry
Asymmetric catalysis stands at the forefront of modern chemistry, serving as a cornerstone for the efficient creation of enantiopure chiral molecules characterized by their high selectivity. In this review, we delve into the realm of asymmetric catalytic
Ashna Garg, Dominick Rendina, Hersh Bendale, Takahiko Akiyama, Iwao Ojima, Iwao Ojima   +5 more
doaj   +1 more source

A Planar-Chiral Rhodium(III) Catalyst with a Sterically Demanding Cyclopentadienyl Ligand and Its Application in the Enantioselective Synthesis of Dihydroisoquinolones.

Angewandte Chemie, 2018
The rapid development of enantioselective C-H activation reactions has created a demand for new types of catalysts. Herein, we report the synthesis of a novel planar-chiral rhodium catalyst [(C5 H2t Bu2 CH2t Bu)RhI2 ]2 in two steps from commercially ...
E. A. Trifonova, Nikita M. Ankudinov, A. Mikhaylov, D. Chusov, Y. Nelyubina, D. Perekalin   +5 more
semanticscholar   +1 more source

Enantioselective Total Synthesis of (+)‐Tricycloclavulone. [PDF]

ChemInform, 2004
The first total synthesis of (+)-tricycloclavulone having a unique tricyclo[5,3,0,01,4]decane skeleton and six chiral centers was achieved in a highly stereoselective manner. It includes a catalytic enantioselective [2+2]-cycloaddition reaction using novel chiral copper catalyst, extremely effecting an intramolecular ester transfer reaction, and ...
Tatsuya Kobayashi, Mineki Hasegawa, Hisanaka Ito, Yosuke Takenaka, Kazuo Iguchi   +4 more
openaire   +4 more sources

The Influence of the Supporting Substrate on Single‐Particle Circular Differential Scattering of DNA Assembled Nanorod Dimers

Advanced Optical Materials, EarlyView.
For most microscopy measurements the sample is placed on a substrate, which causes symmetry breaking, especially relevant for chiral plasmonic nanostructures. DNA origami mediated X‐shaped AuNR dimers showing high structural purity in solution, exhibit significant diversity in lineshapes and signal intensities for their circular differential scattering
Amrita Chakraborty, Ojasvi Verma, Gopal Narmada Naidu, Mihir Dass, Zhenyang Jia, Christy F. Landes, Alessandro Alabastri, Peter Nordlander, Tim Liedl, Stephan Link   +9 more
wiley   +1 more source

Modification of chiral dimethyl tartrate through transesterification : immobilisation on POSS and enantioselectivity reversion in Sharpless asymmetric epoxidation [PDF]

, 2010
Modification of dimethyl tartrate has been investigated through transesterification with aminoalcohols to provide reactive functionalities for the covalent bonding of chiral tartrate to polyhedral oligomeric silsesquioxanes.
García, Rafael A., Gibson, Colin L., Iglesias, José, Sherrington, David C., Van Grieken, Rafael   +4 more
core   +1 more source

Double‐Sided Control of Product Type Preference in the Visible‐Light Initiated Reaction of 1,3‐Dicarbonyl Compounds with Alkenes

Advanced Synthesis &Catalysis, EarlyView.
Abstract The demonstrated light‐initiated addition of radicals formed on an active methylene group to styrene derivatives exhibits a product selectivity influenced by the presence of a protic solvent. Under protic conditions, the predominant products are branched compounds with the alkene moiety attached to the methylene group.
Małgorzata Pałyga, Jan Rzepiela, Sebastian Baś   +2 more
wiley   +1 more source

Probing the optical chiral response of single nanoparticles with optical tweezers [PDF]

, 2020
We propose an enantioselective scheme to sort homogeneous chiral particles using optical tweezers. For a certain range of material parameters, we show that a highly focused circularly-polarized laser beam traps particles of a specific chirality selected by the handedness of the trapping beam. Furthermore, by applying a transverse Stokes drag force that
arxiv   +1 more source

A Flexible Enantioselective Synthesis of the Isofurans. [PDF]

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Douglass F. Taber, Xia Zhao, Yongchun Pan   +2 more
openaire   +4 more sources

Effective and Practical Stereoselective Synthesis of Nutlins Precursors by Immobilization of Privileged Chiral Mono‐Amidine Catalyst

Advanced Synthesis &Catalysis, EarlyView.
Abstract A strategy for the immobilization of Johnston's Mono(AMidine) catalyst (MAM) onto polystyrene, silica and hybrid silica‐polystyrene nanoparticles is presented. The catalyst activity was evaluated in the stereoselective aza‐Henry reaction leading to the pivotal β‐amino nitroalkane precursors of the anti‐cancer agents Nutlins (with Nutlin‐3a as ...
Sofia Toldo, Lorenzo Poletti, Graziano Di Carmine, Olga Bortolini, Carmela De Risi, Simona Felletti, Greta Compagnin, Alessandro Massi, Daniele Ragno   +8 more
wiley   +1 more source

Asymmetric construction of allylicstereogenic carbon center featuring atrifluoromethyl group via enantioselective reductive fluoroalkylation

Nature Communications, 2022
The efficient construction of trifluoromethylated alkanes bearing a CF3 chiral center is of great importance in organic synthesis. Here, the authors disclose the enantioselective syntheses of α-trifluoromethylated allylic alkanes via reductive ...
Ruo-Xing Jin, Bing-Bing Wu, Kang-Jie Bian, Jian-Liang Yu, Jing-Cheng Dai, Ya-Wen Zuo, Yi-Fan Zhang, Xi-Sheng Wang   +7 more
doaj   +1 more source