Results 71 to 80 of about 11,460 (224)

Rh(II)/Pd(0) Dual Catalysis: Carbenoid N-H Insertion/Allylation Cascade Reaction to Construct Highly Functionalized and Polysubstituted Pyrrolidines

Molecules
In the category of drugs approved by the U.S. FDA, pyrrolidine is the most frequently used core of five-membered nonaromatic heterocycles containing nitrogen.
Maocheng Tang, Xianyan Jiao, Deping He, Ji-Xing Zhao, Ping Liu, Chun-Tian Li   +5 more
doaj   +1 more source

5-(tert-Butyldimethylsilyloxy)-1-(2-chloro-5,8-dimethoxyquinolin-3-yl)-3-methylenepentan-1-ol

Molbank, 2012
Novel 5-(tert-butyldimethylsilyloxy)-1-(2-chloro-5,8-dimethoxyquinolin-3-yl)-3-methylenepentan-1-ol (7) was prepared via allylation of 2-chloro-5,8-dimethoxyquinoline-3-carbaldehyde (6) with functionalized allylic iodide as tert-butyl-(3-(iodomethyl)but ...
Linda Bouarata, Dahmane Tebbani, Paul Mosset   +2 more
doaj   +1 more source

The Radical Chemistry of 2,3‐Diguanidinopyridines: Coordination and Visible‐Light Photochemistry

Chemistry – A European Journal, EarlyView.
Substitution at the pyridine core of 2,3‐diguanidinopyridines was used to develop novel redox‐active molecules with three interconvertible redox states. They are applied as redox‐active ligands in coordination chemistry. Visible‐light irradiation of the pyridine N‐benzylated molecules leads to photoconversion to a higher‐energetic isomer.
Hanna Koepcke, Etienne Engels, Elisabeth Kaifer, Hans‐Jörg Himmel   +3 more
wiley   +1 more source

Chiral Phosphoric Acid Catalyzed Enantioselective Allylation of Aldehydes with Allyltrichlorosilane

, 2011
Easily accessible chiral phosphoric acid 1b has been applied as efficient organocatalyst for the asymmetric allylation of aldehydes with allyltrichlorosilane.
Fan Tiantian, Sun Jian, Sun, J (reprint author), Chinese Acad Sci, Chengdu Inst Biol, Nat Prod Res Ctr, Chengdu 610041, Sichuan, Peoples R China., Cheng Ke   +3 more
core  

Chelation-Assisted Substrate-Controlled Asymmetric Lithiation-Allylboration of Chiral Carbamate 1,2,4-Butanetriol Acetonide

Molecules, 2015
The lithiation of 2-(2,2-dimethyl-1,3-dioxolan-4-yl)ethyl diisopropylcarbamate (1) is achieved freely by sec-butyllithium in diethylether with high lk-diastereoselectivity: the bicyclic chelate complexes 3a and 3b are reacted with electrophiles to form ...
Adeem Mahmood, Hamad Z. Alkhathlan, Saima Parvez, Merajuddin Khan, Sohail A. Shahzad   +4 more
doaj   +1 more source

Lignocellulosic Triboelectric Materials for Energy Harvesting and Emerging Applications: A Review on Lignin‐Molecular Engineering toward Improved Performance

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Contrasting sustainable biomass with depleting petroleum resources, this review charts the evolutionary timeline of lignin‐based TENGs. We systematically evaluate their fundamental mechanisms, enhancement strategies, and applications in green self‐powered electronics.
Yuxin Yang, Boyu Du, Yuwen Wang, Tian Tang, Yuxuan Xie, Jiajun Zhang, Yajun Zhang, Jingyu Xu, Xing Wang, Chuanyin Xiong   +9 more
wiley   +1 more source

APLICAÇÃO DE AMIDOXIMAS COMO CATALISADORES DA REAÇÃO DE ALILAÇÃO POR ALILTRIFLUOROBORATO DE POTÁSSIO EM MEIO BIFÁSICO

Química Nova
We describe the application of an amidoxime as catalyst in the synthesis of homoallylic alcohols from the allylation reaction of aldehydes with different features using potassium allyltrifluoroborate. The reaction was conducted with a catalytic amount of
Dmistocles de Andrade, João Rufino de Freitas Filho, Juliano Carlo Rufino Freitas   +2 more
doaj   +1 more source

Asymmetric Synthesis of Tertiary α‐Aryl Stereocentres in Tetrahydro‐4H‐pyran‐4‐ones Using Pd‐Catalyzed Decarboxylative Asymmetric Protonation

European Journal of Organic Chemistry, EarlyView.
The Pd‐catalyzed decarboxylative asymmetric protonation (DAP) has been developed for sterically hindered tetrahydro‐4H‐pyran‐4‐one derived α‐aryl‐β‐keto esters. A substrate scope of nine examples of DAP showed that substrates containing a di‐ortho methoxy substitution pattern on the aryl ring gave rise to the highest enantioselectivities of up to 85 ...
Fionn McNeill, Joffrey Scriven, Fritz Bahns, Anugam V. Krishna, Julia Bruno‐Colmenarez, Patrick J. Guiry   +5 more
wiley   +1 more source

Asymmetric Decarboxylative Allylation of Oxindoles

, 2016
An asymmetric decarboxylative palladium-catalyzed allylation of alkyl- and aryl-substituted oxindoles has been developed, enabling the installation of an all-carbon quaternary chiral center at the oxindole 3-position in excellent yields and good to ...
David S. Pugh (2175696), Vilius Franckevičius (1555279), Richard J. K. Taylor (1662202), James D. Cuthbertson (1939231), Mark Pickworth (2175694)   +4 more
core   +1 more source

Reductively Stable Platinum Catalyst Enabling Metallaphotoredox Reductive Allylation of Ketones, Aldehydes, and Imines

ChemistryEurope
This work demonstrates the catalytic reductive allylation of ketones, aldehydes, and imines using a synergistic platinum/photoredox catalyst system. Notably, this method is applicable even to acetophenone derivatives, affording homoallylic alcohols that ...
Junpei Shimosato, Kousei Nishimura, Bunta Fukuyo, Yohei Shimizu, Masaya Sawamura, Yusuke Masuda   +5 more
doaj   +1 more source