Results 151 to 160 of about 3,273,294 (390)

Photogeneration and Visualization of a Surface‐Stabilized Dinitrene

Angewandte Chemie, EarlyView.
In this communication we report the formation of a stable, surface‐supported dinitrene achieved through the photolysis of a diazide precursor on an Au(111) metal substrate. We combine high‐resolution scanning probe techniques with theoretical calculations, providing the first real‐space imaging of a metal nitrene adsorbed on a surface and exploring the
Federico Frezza, Ana Sánchez‐Grande, Sofia Canola, Christophe Nacci, Jiří Klívar, Pingo Mutombo, Qifan Chen, José María Gómez‐Fernandez, Carlos Sánchez‐Sánchez, Jan Berger, Karl‐Heinz Ernst, Irena G. Stará, José Ángel Martín‐Gago, Ivo Starý, Leonhard Grill, Pavel Jelínek   +15 more
wiley   +2 more sources

Photocatalytic Enantioselective Radical Cascade Multicomponent Minisci Reaction of β‐Carbolines Using Diazo Compounds as Radical Precursors

Advanced Science
Here, a photocatalytic asymmetric multicomponent cascade Minisci reaction of β‐carbolines with enamides and diazo compounds is reported, enabling an effective enantioselective radical C─H functionalization of β‐carbolines with high yields and ...
Yi‐Jie Gu, Mu‐Peng Luo, Hua Yuan, Guo‐Kai Liu, Shou‐Guo Wang   +4 more
doaj   +1 more source

Enantioselective formal carbene insertion into C–N bond of aminal as a concise track to chiral α-amino-β2,2-amino acids and synthetic applications

Green Synthesis and Catalysis, 2021
Chiral α-amino-β2,2-amino acid is an ubiquitous fragment that presents in natural products, pharmaceuticals, and bioactive molecules. However, the catalytic enantioselective synthesis of α-amino-β2,2-amino acids with structural complexity and diversity ...
Xue Tian, Xinfang Xu, Tongfei Jing, Zhenghui Kang, Wenhao Hu   +4 more
doaj  

Enantioselective synthesis of aziridines using asymmetric transfer hydrogenation as a precursor for chiral derivatives used as bonding agent for rocket solid propellants

Química Nova, 2002
A rapid, expedient and enantioselective method for the synthesis of beta-hydroxy amines and monosubstituted aziridines in up to 99% e.e., via asymmetric transfer hydrogenation of a-amino ketones and cyclisation through treatment with tosyl chloride and ...
Aparecida M. Kawamoto, Martin Wills
doaj   +1 more source

Enantioselective Cross-Coupling for Axially Chiral Tetra-ortho-Substituted Biaryls and Asymmetric Synthesis of Gossypol.

Journal of the American Chemical Society, 2020
Axially chiral tetra-ortho-substituted biaryl skeleton exists in numerous biologically important natural products, pharmaceutical molecules, chiral catalysts and ligands. The efficient synthesis of chiral tetra-ortho-substituted biaryl structures remains
He Yang, Jiawei Sun, W. Gu, Wenjun Tang
semanticscholar   +1 more source

Recent advances in the total synthesis of agelastatins [PDF]

, 2010
Agelastatins represent an important family of marine alkaloids in terms of both exceptional biological activity and intriguing chemical structure.
Dong, Guangbin
core   +1 more source

Enantio‐ and Diastereoselective Synthesis and Spiral‐Stair‐Like Single Helix Assembly of Figure‐Eight Cyclophenylenes

Angewandte Chemie, EarlyView.
We present here the enantio‐ and diastereoselective synthesis of chiral figure‐eight [10]cyclophenylenes via the rhodium‐catalyzed four consecutive intramolecular [2 + 2 + 2] cycloadditions of dodecaynes with two flexible biphenyl units, resulting in increased rotational freedom of the reaction intermediates.
Kohei Adachi, Juntaro Nogami, Daisuke Hashizume, Daiki Tauchi, Masashi Hasegawa, Ken Tanaka   +5 more
wiley   +2 more sources

Synthesis of the tetracyclic core of Illicium sesquiterpenes using an organocatalyzed asymmetric Robinson annulation

Beilstein Journal of Organic Chemistry, 2013
An enantioselective synthesis of the core framework of neurotrophic Illicium majucin-type sesquiterpenes is described here. This strategy is based on an organocatalyzed asymmetric Robinson annulation and provides an efficient approach for a diversity ...
Lynnie Trzoss, Jing Xu, Michelle H. Lacoske, Emmanuel A. Theodorakis   +3 more
doaj   +1 more source

Rhodium/phospholane-phosphite catalysts give unusually high regioselectivity in the enantioselective hydroformylation of vinyl arenes [PDF]

, 2014
Using the phospholane-phosphite ligand, BOBPHOS, almost perfect regioselectivities and high enantioselectivities (up to 92% ee) are observed in Rh catalysed enantioselective hydroformylation of vinyl arenes.
Clarke, Matthew L., Cobley, Christopher J., Mahoney, Thomas, Noonan, Gary M.   +3 more
core   +1 more source

Engineering 2‐Deoxy‐D‐ribose‐5‐phosphate Aldolase for anti‐ and syn‐Selective Epoxidations of α,β‐Unsaturated Aldehydes

Angewandte Chemie, EarlyView.
The anti‐ and syn‐selective epoxidation of various α,β‐unsaturated aldehydes is promoted by an engineered variant of 2‐deoxy‐D‐ribose‐5‐phosphate aldolase (DERA), giving rise to various α,β‐epoxy‐aldehydes with excellent enantiopurity (enantiomeric ratio up to 99 : 1). Abstract The enzyme 2‐deoxy‐D‐ribose‐5‐phosphate aldolase (DERA) naturally catalyzes
Hangyu Zhou, Andreas Kunzendorf, Guangcai Xu, Hylke O. T. Frietema, Andy‐Mark W. H. Thunnissen, Gerrit J. Poelarends   +5 more
wiley   +2 more sources