Synthesis of N‐Heterocycles via Oxidant‐Free Dehydrocyclization of Alcohols Using Heterogeneous Catalysts

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(48), P. 25188 - 25202

Published: June 17, 2021

N-Heterocycles, such as pyrroles, pyrimidines, quinazolines, and quinoxalines, are important building blocks for organic chemistry the fine-chemical industry. For their synthesis, catalytic borrowing hydrogen acceptorless dehydrogenative coupling reactions of alcohols sustainable reagents have received significant attention in recent years. To overcome problems product separation catalyst reusability, several metal-based heterogeneous catalysts been reported to achieve these transformations with good yields selectivity. In this Minireview, we summarize developments using both noble non-noble synthesize N-heterocycles from N-nucleophiles via dehydrogenation or methodologies. Furthermore, Minireview introduces strategies preparation functionalization corresponding catalysts, discusses reaction mechanisms roles metal electronic states, influence support Lewis acid-base properties on reactions.

Language: Английский

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Recent advancement in oxidation or acceptorless dehydrogenation of alcohols to valorised products using manganese based catalysts

Coordination Chemistry Reviews, Journal Year: 2020, Volume and Issue: 411, P. 213241 - 213241

Published: March 4, 2020

Language: Английский

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Tandem transformations and multicomponent reactions utilizing alcohols following dehydrogenation strategy

Organic & Biomolecular Chemistry, Journal Year: 2020, Volume and Issue: 18(12), P. 2193 - 2214

Published: Jan. 1, 2020

In this review, the progress of tandem transformation nitro, nitrile and azide functionalities is summarised to develop new C–C C–N bonds as well multi-component reactions using alcohols.

Language: Английский

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Iridium supported on porous polypyridine-oxadiazole as high-activity and recyclable catalyst for the borrowing hydrogen reaction

Green Chemistry, Journal Year: 2022, Volume and Issue: 24(6), P. 2602 - 2612

Published: Jan. 1, 2022

Porous polypyridine-oxadiazole supported iridium catalysts (PPO-Ir) revealed high catalytic activity for the reaction of dimethyl-6-aminouracil (including 1,3-dimethylbarbituric acid, 2-aminobenzylamine) with alcohols.

Language: Английский

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Heavy metals immobilization and bioavailability in multi-metal contaminated soil under ryegrass cultivation as affected by ZnO and MnO2 nanoparticle-modified biochar

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: May 9, 2024

Abstract Pollution by heavy metals (HMs) has become a global problem for agriculture and the environment. In this study, effects of pristine biochar modified with manganese dioxide (BC@MnO 2 ) zinc oxide (BC@ZnO) nanoparticles on immobilization bioavailability Pb, Cd, Zn, Ni in soil under ryegrass ( Lolium perenne L.) cultivation were investigated. The results SEM–EDX, FTIR, XRD showed that ZnO MnO successfully loaded onto biochar. BC, BC@MnO BC@ZnO treatments significantly increased shoots roots dry weight compared to control. maximum root shoot (1.365 g pot −1 4.163 , respectively) was reached at 1% . HMs uptake decreased after addition amendments. lowest Zn plant (13.176, 24.92, 32.407, 53.88 µg obtained treatment. Modified more successful reducing improving growth than can therefore be used as an efficient cost effective amendment remediation contaminated soils. translocation (TF) bioconcentration factors related Therefore, most treatment soil. Also, comparison TF values had good ability accumulate all studied its roots, it is suitable phytostabilization.

Language: Английский

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Merrifield resin-supported quinone as an efficient biomimetic catalyst for metal-free, base-free, chemoselective synthesis of 2,4,6-trisubstituted pyridines

Green Chemistry, Journal Year: 2019, Volume and Issue: 21(20), P. 5683 - 5690

Published: Jan. 1, 2019

Metal-free, base-free, biomimetic, and chemoselective synthesis of 2,4,6-trisubstituted pyridines was developed for the first time under mild conditions.

Language: Английский

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Sustainable and Selective Alkylation of Deactivated Secondary Alcohols to Ketones by Non‐bifunctional Pincer N‐heterocyclic Carbene Manganese

ChemSusChem, Journal Year: 2020, Volume and Issue: 13(10), P. 2557 - 2563

Published: March 31, 2020

Abstract A sustainable and green route to access diverse functionalized ketones via dehydrogenative–dehydrative cross‐coupling of primary secondary alcohols is demonstrated. This borrowing hydrogen approach employing a pincer N‐heterocyclic carbene Mn complex displays high activity selectivity. variety are well tolerant result in satisfactory isolated yields. Mechanistic studies suggest that this reaction proceeds direct outer‐sphere mechanism the dehydrogenation alcohol substrates plays vital role rate‐limiting step.

Language: Английский

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Synthesis and characterization of a supported Pd complex on volcanic pumice laminates textured by cellulose for facilitating Suzuki–Miyaura cross-coupling reactions

RSC Advances, Journal Year: 2020, Volume and Issue: 10(39), P. 23359 - 23371

Published: Jan. 1, 2020

Herein, a novel high-performance heterogeneous catalytic system made of volcanic pumice magnetic particles (VPMP), cellulose (CLS) natural polymeric texture, and palladium nanoparticles (Pd NPs) is presented. The introduced VPMP@CLS-Pd composite has been designed based on the principles green chemistry, suitably applied in Suzuki-Miyaura cross-coupling reactions, as an efficient system. Concisely, inherent property VPMP (30 emu g-1) provides great possibility for separation catalyst from reaction mixture with ease. In addition, high heterogeneity structural stability are obtained by this composition resulting remarkable recyclability (ten times successive use). As main sites, finely distributed onto VPMP@CLS structure. To catalyze reactions producing biphenyl pharmaceutical derivatives, present Pd NPs were reduced chemical state Pd2+ to Pd0. regard, plausible mechanism submitted context well. result performed analytical methods (including FT-IR, EDX, VSM, TGA, FESEM, TEM, BTE, XPS), it shown that spherical-shaped nanoscale have well surfaces porous laminate-shaped VPMP. However, used facilitating synthetic biphenyls, yields (∼98%) short time (10 min) using small amount (0.01 g), under mild conditions (room temperature).

Language: Английский

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Lignin-derived Zn single atom/N-codoped porous carbon for α-alkylation of aromatic ketones with alcohols via borrowing hydrogen strategy

Nano Research, Journal Year: 2021, Volume and Issue: 15(3), P. 1874 - 1881

Published: Sept. 2, 2021

Language: Английский

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Iridium Supported on Phosphorus‐Doped Porous Organic Polymers: Active and Recyclable Catalyst for Acceptorless Dehydrogenation and Borrowing Hydrogen Reaction

Advanced Synthesis & Catalysis, Journal Year: 2019, Volume and Issue: 361(24), P. 5695 - 5703

Published: Oct. 22, 2019

Abstract Iridium‐on‐phosphorus‐doped porous organic polymers (POP−Ir) were developed by anchoring simple iridium onto the skeleton of through coordination bonds. This POP−Ir catalyst, which was thoroughly characterized means EDS, SEM, TEM, XRD, XPS, and FT‐IR, revealed excellent catalytic activity for reaction diphenyl phosphinamide with benzyl alcohols borrowing hydrogen strategy acceptorless dehydrogenation wide functional group tolerance. Moreover, this catalyst could be simply recovered reused at least five times without a significant loss activity, considerable application prospects. The mechanism investigated to further understand system transformations. Overall, has shown high reusability in between phosphinamides alcohols. magnified image

Language: Английский

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