Results 61 to 70 of about 23,799 (225)

Stereoretentive Nucleophilic Aromatic Substitution Accesses Atropisomeric 4‐Amino‐N‐Arylquinolinium Salts

Chemistry – A European Journal, EarlyView.
Quinolin‐4‐ones were converted to chloroquinolinium salts, allowing formation of axially chiral aminoquinolinium salts via an enantioretentive SNAr reaction with a variety of amine nucleophiles. The salts have a high rotational barrier, with a racemization half‐life of ∼1000s of years.
Darren Holmes, Nia Foster, Saima Ansari, Paul Kavanagh, Paul Dingwall, Peter C. Knipe   +5 more
wiley   +1 more source

Dual‐Functional Polystyrene‐Based Borate Complexes: Recyclable Alkyl Radical Sources and Photodegradable Absorbents

Chemistry – A European Journal, EarlyView.
Dual‐functional polystyrene‐based polymers bearing 2,2′‐(pyridine‐2,6‐diyl)diphenol (PDP) moieties form photoexcitable alkyl borate complexes: (i) As recyclable radical sources, they enable Giese‐type additions with facile purification by reprecipitation and demonstrate proof‐of‐concept for polymer recovery (50% PDP regeneration).
Nami Jimba, Ryosei Ishii, Kazuki Wako, Tomoki Hirohata, Kosuke Sato, Tomohiro Kubo, Kotaro Satoh, Yuto Sumida, Hirohisa Ohmiya, Shinsuke Inagi   +9 more
wiley   +1 more source

Facile, Regio- and Diastereoselective Synthesis of Spiro-Pyrrolidine and Pyrrolizine Derivatives and Evaluation of Their Antiproliferative Activities

Molecules, 2014
A number of novel spiro-pyrrolidines/pyrrolizines derivatives were synthesized through [3+2]-cycloaddition of azomethine ylides with 3,5-bis[(E)-arylmethylidene]tetrahydro-4(1H)-pyridinones 2a–n.
Abdulrahman I. Almansour, Raju Suresh Kumar, Farzana Beevi, Amir Nasrolahi Shirazi, Hasnah Osman, Rusli Ismail, Tan Soo Choon, Brian Sullivan, Kellen McCaffrey, Alaa Nahhas, Keykavous Parang, Mohamed Ashraf Ali   +11 more
doaj   +1 more source

Synthesis and Structures of Novel Chiral Cyclic Hypervalent Iodine(III) Reagents for Metal‐Free Ligand‐Transfer Reactions

Chemistry – A European Journal, EarlyView.
Several new chiral cyclic hypervalent iodine(III) reagents have been synthesized and characterized. Carbon‐based ligands were successfully installed onto the hypervalent iodine centers, giving thus access to novel chiral cyano‐, trifluoromethyl‐ or alkynyl‐bearing λ3‐iodanes.
Emmanuel Valzer, Jean‐Marc Sotiropoulos, Karinne Miqueu, Laurent Pouységu, Stéphane Quideau   +4 more
wiley   +1 more source

Photochromic Donor–Acceptor Naphthalenediimides Enabling Near‐Infrared Photothermal Conversion for Seawater Desalination

Chemistry – A European Journal, EarlyView.
Photoinduced radical formation in donor–acceptor NDI molecules generates strong near‐infrared absorption, enabling efficient photothermal conversion and solar‐driven seawater desalination. ABSTRACT Photochromic donor–acceptor molecules that produce near‐infrared (NIR) absorption upon light activation offer promising platforms for organic photothermal ...
Sotaro Kusumoto, Soushi Kurihara, Masaya Shimabukuro, Naoki Ogiwara, Nobutsugu Hamamoto, Jack Harrowfield, Yang Kim, Yoshihiro Koide   +7 more
wiley   +1 more source

Radical cascades using enantioenriched 7-azabenzonorbornenes and their applications in synthesis

Beilstein Journal of Organic Chemistry, 2008
Tandem deoxygenation–neophyl-type radical rearrangement–electrophile trapping using xanthates from 7-azabenzonorbornadienes gives 3-exo-substituted 2-aza-5,6-benzonorbornenes, which in some cases undergo isomerisation to (aminomethyl)indenes.
David M. Hodgson, Leonard H. Winning
doaj   +1 more source

Efficient Synthesis of Fully Substituted Pyrrolidine-Fused 3-Spirooxindoles via 1,3-Dipolar Cycloaddition of Aziridine and 3-Ylideneoxindole

Molecules, 2016
Drug-like spirocyclic scaffolds have been prepared by fusing fully functionalized pyrrolidine with oxindoles in an approach based on 1,3-dipolar cycloaddition.
Wen Ren, Qian Zhao, Chuan Zheng, Qiong Zhao, Li Guo, Wei Huang   +5 more
doaj   +1 more source

Ullmann‐Type N‐Heteroarylation of Nitrogen Heterocycles Catalyzed by Heterogeneous CuNPs/HKUST‐1

EcoEnergy, EarlyView.
A practical strategy for the direct synthesis of CuNPs/HKUST‐1 heterogeneous catalyst was developed and used for the catalyzing Ullmann‐type N‐arylation of N‐heterocycles with high yields, excellent recyclability, and low copper leaching. ABSTRACT Ullmann‐type C–N coupling is an essential reaction to construct functional nitrogen heterocycles, whereas ...
Shuai Yang, Fangshu Han, Yamin Dong, Liangting Wu, Wenchao Tang, Changyan Guo, Jide Wang, Ablimit Abdukader, Chenjiang Liu, Yonghong Zhang   +9 more
wiley   +1 more source

Improved Incorporation of Arylglycines Into Ramoplanin Sequences via Solid‐Phase Peptide Synthesis

European Journal of Organic Chemistry, EarlyView.
The incorporation of arylglycines using solid‐phase peptide synthesis remains challenging due to the sensitivity of these residues for epimerization. Here, exploring multiple conditions for the incorporation of arylglycine residues into peptides using SPPS demonstrates how small changes to current synthesis protocols can lead to significant ...
Edward Marschall, Sam Tucker, Max J. Cryle, Julien Tailhades   +3 more
wiley   +1 more source

Stereoselective Construction of Benzo‐Fused Tetrahydropyrrole Thiazines From Saccharin

European Journal of Organic Chemistry, EarlyView.
Saccharin was used as a template to construct a series of 10a‐substituted, benzo‐fused, pyrrolo thiazinone dioxides. Thereafter, diastereo‐divergent 10‐keto reduction gave either diastereomeric alcohol in a process that did not rely on the substituent at 10a's identity.
Seanán Doyle, Matthew Kiernan, Jordan Smyth, Ajay Mathew, Conor J. Crawford, Julia Bruno‐Colmenarez, Patrick J. Guiry, Aisha Khalifa, Paul Evans   +8 more
wiley   +1 more source