scholarly journals Palladium(II) on 4 Å Molecular Sieves: A Simple and Reusable Catalyst for the Preparation of Ynones

2020 ◽  
Vol 150 (11) ◽  
pp. 3335-3341
Author(s):  
Kinga Juhász ◽  
Zoltán Hell
Keyword(s):  
Molecular Sieves ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Terminal Alkynes ◽  
Acyl Chlorides

Abstract Pd2+ on 4 Å molecular sieves support has been prepared and investigated. The catalyst has successfully been used in the reaction of acyl chlorides and terminal alkynes yielding ynones. The catalyst can be reused without significant loss of activity. Graphic Abstract

scholarly journals Synthesis of Alkynyl Ketones by Sonogashira Cross-Coupling of Acyl Chlorides with Terminal Alkynes Mediated by Palladium Catalysts Deposited over Donor-Functionalized Silica Gel

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1186
Author(s):  
Miloslav Semler ◽  
Filip Horký ◽  
Petr Štěpnička
Keyword(s):  
Silica Gel ◽  
Palladium Catalysts ◽  
Cross Coupling ◽  
Significant Loss ◽  
Terminal Alkynes ◽  
Reaction Conditions ◽  
Co Catalyst ◽  
Acyl Chlorides ◽  
Good Catalytic Activity ◽  
Repeated Use

Palladium catalysts deposited over silica gel bearing simple amine (≡Si(CH2)3NH2) and composite functional amide pendants equipped with various donor groups in the terminal position (≡Si(CH2)3NHC(O)CH2Y, Y = SMe, NMe2 and PPh2) were prepared and evaluated in Sonogashira-type cross-coupling of acyl chlorides with terminal alkynes to give 1,3-disubstituted prop-2-yn-1-ones. Generally, the catalysts showed good catalytic activity in the reactions of aroyl chlorides with aryl alkynes under relatively mild reaction conditions even without adding a copper co-catalyst. However, their repeated use was compromised by a significant loss of activity after the first catalytic run.

scholarly journals Cellulose sulphuric acid as a biodegradable and reusable catalyst for the Knoevenagel condensation

2010 ◽  
Vol 8 (1) ◽  
pp. 12-18 ◽  
Author(s):  
Kiran Shelke ◽  
Suryakant Sapkal ◽  
Kirti Niralwad ◽  
Bapurao Shingate ◽  
Murlidhar Shingare
Keyword(s):  
Sulphuric Acid ◽  
Knoevenagel Condensation ◽  
Ethyl Cyanoacetate ◽  
Reaction Times ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Environmental Friendliness ◽  
Solvent Free Condition ◽  
High Yields ◽  
Work Up

AbstractA green, mild and efficient method for Knoevenagel condensation of 3-formylchromone/2-chlroquinoline-3-carbaldehyde with active methylene compounds such as Meldrum’s acid/ethyl cyanoacetate using biosupported cellulose sulphuric acid (CSA) in the solid-state by grinding under solvent-free condition has been developed. This method provides several advantages including environmental friendliness, shor t reaction times, high yields and a simple work-up procedure. Moreover, the CSA was successfully reused for four cycles without significant loss of activity.

Consecutive Multicomponent Reactions: Synthesis of 3-Acyl-4-alkynyl-Substituted 1,3-Thiazolidines

Synthesis ◽  
2018 ◽  
Vol 50 (05) ◽  
pp. 1123-1132 ◽  
Author(s):  
Jürgen Martens ◽  
Torben Schlüter ◽  
Nils Frerichs ◽  
Marc Schmidtmann
Keyword(s):  
Functional Groups ◽  
Multicomponent Reactions ◽  
Terminal Alkynes ◽  
Synthetic Route ◽  
Acyl Chlorides ◽  
Mild Conditions ◽  
Three Component Reaction

This work describes the synthesis of compounds containing thiazolidine and propargylamidic motifs. Their preparation follows a synthetic route containing two multicomponent reactions. First, the Asinger four-component reaction is used to prepare 3-thiazolines and 3-oxazolines. Secondly, these heterocyclic imines are converted into propargylamides by a copper-catalyzed three-component reaction using acyl chlorides and terminal alkynes. The synthetic route is characterized by mild conditions and many functional groups are tolerated. The formation of an unexpected α-alkynoxyamide is also presented.

Magnetic Nanoparticles Supported Acidic Ionic Liquid as a Highly Active and Reusable Catalyst for Esterification

2016 ◽  
Vol 852 ◽  
pp. 485-488 ◽  
Author(s):  
Qiang Zhang ◽  
Xin Zhao ◽  
Xue Hua Zhu ◽  
Ji Hang Li
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
External Magnet ◽  
Acidic Ionic Liquid ◽  
Highly Active

A magnetic nanoparticles supported dual acidic ionic liquid catalyst was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. And this novel supported acidic ionic liquid catalyst showed good catalytic performance in esterification. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.

Rhenium- and manganese-catalyzed carbon–carbon bond formation using 1,3-dicarbonyl compounds and alkynes

2010 ◽  
Vol 82 (7) ◽  
pp. 1491-1501 ◽  
Author(s):  
Yoichiro Kuninobu ◽  
Atsushi Kawata ◽  
Salprima S. Yudha ◽  
Hisatsugu Takata ◽  
Mitsumi Nishi ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Catalytic Amount ◽  
Alder Reaction ◽  
Terminal Alkynes ◽  
Dicarbonyl Compounds ◽  
Keto Esters ◽  
Rhenium Complex ◽  
Diels Alder Reaction ◽  
Carbon Carbon Bond ◽  
Catalyzed Reactions

A rhenium complex, [ReBr(CO)3(thf)]2, catalyzed insertion of terminal alkynes into a C–H bond of active methylene sites of 1,3-dicarbonyl compounds. When a catalytic amount of isocyanide or molecular sieves was added to the reaction mixture, the reaction course changed markedly, and insertion of alkynes into a C–C single bond between α- and β-positions of cyclic and acyclic β-keto esters occurred. The formed acyclic δ-keto esters could be converted to 2-pyranones, which were applied to the synthesis of multisubstituted aromatic compounds via the Diels–Alder reaction and successive elimination of carbon dioxide. In the case of the rhenium-catalyzed reactions between terminal alkynes and β-keto esters without substituent at the α-position, tetrasubstituted benzenes were produced regioselectively by two-to-one reaction of the components. The yields of tetrasubstituted benzenes were improved by using a manganese catalyst.

scholarly journals One-pot multicomponent synthesis of highly substituted pyridines using hydrotalcite as a solid base and reusable catalyst

2021 ◽  
pp. 169-174
Author(s):  
Sandip R. Kale ◽  
Santosh Kumar Surve
Keyword(s):  
Catalytic Activity ◽  
Multicomponent Reaction ◽  
Aromatic Aldehydes ◽  
Significant Loss ◽  
Solid Base ◽  
Reusable Catalyst ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Substituted Pyridines

One-pot synthesis of highly substituted pyridines has been demonstrated via multicomponent reaction of aldehydes, malononitrile and thiophenol using Mg-Al hydrotalcite as a solid base and reusable catalyst. The catalytic activity is intimately connected to the basicity of the catalyst. The best activities were observed with the Mg/Al: 5 catalyst. The catalyst could be reused for further run without a significant loss in activity. The protocol was also applicable for various aromatic aldehydes which affords desired product in good to excellent yield.

Ligand and additive free aerobic synthesis of diynes using Pd–CuFe2O4 magnetic nanoparticles as an efficient reusable catalyst

2020 ◽  
Vol 44 (42) ◽  
pp. 18199-18207
Author(s):  
Rituparna Chutia ◽  
Bolin Chetia
Keyword(s):  
Magnetic Nanoparticles ◽  
Recyclable Catalyst ◽  
Reusable Catalyst ◽  
Terminal Alkynes ◽  
Oxidative Homocoupling

Herein, we present the synthesis of Pd–CuFe2O4 magnetic nanoparticles as an efficient and recyclable catalyst for the oxidative homocoupling of various terminal alkynes to form symmetric 1,3-diynes.

Heterogeneous Gold(III)-Catalysed Double Hydroamination of 2-Alkynylanilines with Terminal Alkynes Leading to N-Vinylindoles

2018 ◽  
Vol 42 (11) ◽  
pp. 558-563
Author(s):  
Weisen Yang ◽  
Li Wei ◽  
Feiyan Yi ◽  
Mingzhong Cai
Keyword(s):  
Magnetic Nanoparticles ◽  
Gold Catalyst ◽  
Significant Loss ◽  
Solvent Free ◽  
Terminal Alkynes ◽  
External Magnet ◽  
Solvent Free Conditions ◽  
Supported Gold

Heterogeneous double hydroamination of 2-alkynylanilines with terminal alkynes was achieved by using a magnetic nanoparticles-supported gold(III)-2,2′-bipyridine complex and silver trifluoromethanesulfonate as catalysts to afford the corresponding N-vinylindoles in moderate to good yields under mild and solvent-free conditions. The heterogeneous gold catalyst can easily be separated from the reaction mixture by simply applying an external magnet and can be recycled up to seven times without significant loss of activity.

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