Article
Chemistry, Multidisciplinary
Chengzhou Jiang, Jiamin Wu, Jiabin Han, Kai Chen, Yang Qian, Zhengyu Zhang, Yaojia Jiang
Summary: An efficient method for synthesizing dicarbonyl functionalized 1,3-dienes by cleaving the C=C bond of enaminones with cyclopropenes in the presence of a rhodium catalyst has been described. The reactions involve a unique cutting and insertion process, leading to the formation of two C-C single bonds. A broad range of substrates can be used under very mild reaction conditions to obtain the corresponding 1,3-dienes.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Organic
Wen-Tian Zeng, Xiao Han, Gong-Bin Huang, Jiang Weng, Albert S. C. Chan, Gui Lu
Summary: An enantioselective reductive coupling of nitrobenzyl bromides with cyclic ketimines was achieved via a synergistic combination of N-heterocyclic carbene (NHC) catalysis and nickel catalysis utilizing a single-electron-transfer (SET) process. This method overcomes the limitation of homoenolate radical species, enabling tight stereocontrol of the nitrobenzyl radical intermediate and providing a direct and facile route to previously inaccessible, enantioenriched 4-substituted 4-aminopyrazolones and 3-substituted 3-aminooxindoles. Furthermore, this NHC/metal cooperative catalysis opens up new reaction pathways, particularly in asymmetric radical reactions.
ORGANIC CHEMISTRY FRONTIERS
(2023)
Review
Chemistry, Organic
Biplob Borah, L. Raju Chowhan
Summary: Spirooxindoles are commonly found in the basic skeletons of various natural alkaloids and therapeutically significant molecules. The development of synthetic methods for the construction of these compounds is challenging. Meanwhile, the utilization of isatin N, N'-cyclic azomethine imines in the synthesis of carbon-carbon and structurally functionalized heterocyclic compounds is still underdeveloped.
TETRAHEDRON LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yang Gao, Sima Yazdani, Aaron Kendrick, Glen P. Junor, Taeho Kang, Douglas B. Grotjahn, Guy Bertrand, Rodolphe Jazzar, Keary M. Engle
Summary: In this study, a selective copper-catalyzed Markovnikov hydrofunctionalization of terminal alkynes is described, facilitated by strongly donating cyclic (alkyl)(amino)carbene (CAAC) ligands. The reaction allows coupling of both alkyl- and aryl-substituted alkynes with a variety of boryl and silyl reagents with high alpha-selectivity. The versatile intermediates produced are scalable and can participate in various downstream transformations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Antonio Del Vecchio, Jakub Talcik, Sophie Colombel-Rouen, Jan Lorkowski, Melinda R. Serrato, Thierry Roisnel, Nicolas Vanthuyne, Guy Bertrand, Rodolphe Jazzar, Marc Mauduit
Summary: New Blechert-type ruthenium complexes with cyclic(alkyl)(amino)carbene (CAAC) ligands show remarkable thermal stability in solution and excellent catalytic performances in various metathesis reactions. They exhibit high catalytic activity at low loading and can achieve high enantiomeric excess in asymmetric metathesis reactions.
Article
Chemistry, Multidisciplinary
Suparnak Midya, Durga Prasad Hari
Summary: A catalytic, highly diastereoselective strain-release Doyle-Kirmse reaction has been developed for synthesizing functionalized F2MCPs using an inexpensive copper catalyst. The reaction displays excellent functional group compatibility on both diazo compounds and difluorocyclopropenyl methyl sulfane/selane derivatives, and the obtained products can be efficiently transformed into valuable building blocks such as functionalized spiroheterocycles and skipped dienes. This method provides a powerful strategy for accessing privileged motifs with high diastereoselectivity.
Article
Engineering, Environmental
Xiaoxuan Guo, Fenglei Zhang, Zhixiu Yang, Lijing Gao, Ruiping Wei, Guomin Xiao
Summary: This study reports a new construction strategy to introduce dual active sites into a porous covalent organic framework, effectively driving the simultaneous activation of CO2 and substrate. The catalyst exhibited high space-time yield in the carboxylation coupling reaction of propargylic alcohols, outperforming most cutting-edge heterogeneous catalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Fangjun Zhang, Keyu Han, Jiamin Cai, Zihao Ye, Jie Zhang, Xigeng Zhou, Zhiming Li
Summary: Rare-earth metal dialkyl complexes can be used to functionalize P-4, resulting in the formation of rare-earth polyphosphorus complexes and organophosphorus compounds. A series of experiments were conducted to achieve atom-economic conversion of P-4, and the new compounds were characterized.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Ponnaiah Sathish Kumar, Periakaruppan Prakash, Alagar Srinivasan, Chelladurai Karuppiah
Summary: The study presents a novel nanocomposite electrode consisting of ferrous tungstate and functionalized multiwalled carbon nanotubes, fabricated hydrothermally for high-performance supercapacitors. This electrode exhibits high specific capacitance and excellent cycling stability. Analytical techniques confirm the thermal stability and crystallinity of the composite, and energy-dispersive X-ray analysis is used for elemental analysis, showing a well-distributed structure.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Seyedeh Molood Masoom Nataj, Serge Kaliaguine, Frederic-Georges Fontaine
Summary: An effective method for tuning CO2 adsorption, activation and transformations of epoxides in CO2 fixation reactions is the introduction of functional groups into the pores of metal-organic frameworks (MOFs) through ligand modification. In this study, a novel ionic ligand, H2BPDC-[TBD]Br-+(-), was synthesized to construct derivatives of the cationic guanidinium-containing Zr-MOF (UiO67-[TBD]Br-+(-)) with free bromide ions, as multifunctional heterogeneous catalysts. The synthesized UiO67-[TBD]Br-+(-) exhibited efficient catalytic performance in the CO2 fixation reaction with epoxides, showing high yield and selectivity under mild conditions.
Article
Chemistry, Applied
Tiantian Li, Xinju Zhu, Hui Jiang, Yanong Wang, Nan Zheng, Tian Peng, Rui Gao, Linlin Shi, Xin-Qi Hao, Mao-Ping Song
Summary: An efficient method for the practical formation of functionalized spirooxindoles was developed, which involved generating sterically congested spiroketal system and bearing two quaternary stereocenters via a sequential palladium-catalyzed decarboxylative [3 + 2] cycloaddition of vinylethylene carbonates (VECs) and isatins. The redox-neutral catalytic system exhibited operational convenience, good functional group tolerance, and good regioselectivity and diastereoselectivity, enabling a diastereoselective synthesis of spiroketal oxindole skeletons in an excellent yield.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yi Liu, Jinya Li, Zhengkun Zhang, Yabin Hou, Li Wang, Jinglai Zhang
Summary: Considerable attention has been focused on the development of catalysts for the coupling reaction of carbon dioxide (CO2) and epoxides due to the distinct advantages and importance of this reaction. The study reports a new heterogeneous catalyst, MIL101-ImEtOH, for the cycloaddition of CO2 and styrene oxide, which exhibits high activity under moderate conditions.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Sushil Kumar, Ganga Ram Chaudhary, Savita Chaudhary, Ahmad Umar
Summary: This study reports a facile fabrication method for functionalized gadolinium oxide nanoparticles and their application in sensing L-Cysteine. The fabricated sensor exhibited good linear response and high sensitivity, and maintained stability and reproducibility in the presence of various interfering substances. The application of the sensor in human urine samples increased its potential prospects in the biomedical field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Ghodsi Mohammadi Ziarani, Maryam Akhgar, Fatemeh Mohajer, Alireza Badiei, Rafael Luque
Summary: SBA-Pr-Is-TAP, a hybrid nanomaterial synthesized by functionalizing SBA-15, can precisely bind Fe3+ and Cr2O72- ions in aqueous media, serving as a nanoporous chemosensor for these ions. The chemosensor showed excellent linear relation with ion concentrations, with detection limits of 2.43 x 10^(-6) M for Fe3+ and 3.96 x 10^(-7) M for Cr2O72- ions.
Article
Chemistry, Analytical
Yini Pan, Chenhui Zhang, Ruili Xiao, Lingyi Zhang, Weibing Zhang
Summary: This work presents the fabrication of a dual-functionalized magnetic bimetallic metal-organic framework composite with strong affinity for phosphopeptides and hydrophilicity for glycopeptides, enabling simultaneous enrichment and sequential elution of both in complex biological samples. The composite demonstrated excellent selectivity, sensitivity, and capacity, and was successfully applied to the analysis of intricate biological samples, showcasing its potential as a reliable candidate for the simultaneous enrichment of trace phosphopeptides and glycopeptides.
ANALYTICA CHIMICA ACTA
(2021)
