Emerging breakthroughs in covalent triazine frameworks: From fundamentals towards photocatalytic water splitting and challenges

Progress in Materials Science, Год журнала: 2024, Номер 147, С. 101352 - 101352

Опубликована: Авг. 14, 2024

Язык: Английский

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

Green Chemistry, Год журнала: 2022, Номер 24(6), С. 2602 - 2612

Опубликована: Янв. 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.

Язык: Английский

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Upgrading Ethanol to n-Butanol in the Presence of Carbonate Catalyzed by a Cp*Ir Complex Bearing a Functional 2,2′-Carbonylbibenzimidazole Ligand

Inorganic Chemistry, Год журнала: 2024, Номер 63(8), С. 3843 - 3849

Опубликована: Фев. 14, 2024

Upgrading ethanol to n-butanol as biofuels is an important topic for sustainable chemistry. Herein, a Cp*Ir complex bearing functional 2,2′-carbonylbibenzimidazole ligand [Cp*Ir(2,2′-COBiBzImH2)Cl][Cl] was designed and synthesized. In the presence of catalyst (0.1 mol %) Cs2CO3 (6 %), highest yield updated up 37% with 80% selectivity. NH units in are crucially catalytic activity iridium complex.

Язык: Английский

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Manganese‐Catalyzed Mono‐N‐Methylation of Aliphatic Primary Amines without the Requirement of External High‐Hydrogen Pressure

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(13)

Опубликована: Фев. 1, 2024

Abstract The synthesis of mono‐ N ‐methylated aliphatic primary amines has traditionally been challenging, requiring noble metal catalysts and high‐pressure H 2 for achieving satisfactory yields selectivity. Herein, we developed an approach the selective coupling methanol amines, without hydrogen, using a manganese‐based catalyst. Remarkably, up to 98 % with broad substrate scope were achieved at low catalyst loadings. Notably, due weak base‐catalyzed alcoholysis formamide intermediates, our novel protocol not only obviates addition but also prevents side secondary ‐methylation, supported by control experiments density functional theory calculations.

Язык: Английский

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A Guide for Mono‐Selective N‐Methylation, N‐Ethylation, and N‐n‐Propylation of Primary Amines, Amides, and Sulfonamides and Their Applicability in Late‐Stage Modification

Chemistry - A European Journal, Год журнала: 2024, Номер 30(26)

Опубликована: Фев. 14, 2024

Abstract This review provides a comprehensive overview of mono‐alkylation methodologies targeting crucial nitrogen moieties – amines, amides, and sulfonamides found in organic building blocks pharmaceuticals. Emphasizing the intersection chemical precision with drug discovery, central challenge addressed is achieving one‐pot mono‐selective short‐chain N‐alkylations (methylations, ethylations, n ‐propylations), preventing undesired overalkylation. Additionally, sustainable, safe, benign alternatives to traditional alkylating agents, including alcohols, carbon dioxide, carboxylic acids, nitriles, alkyl phosphates, quaternary ammonium salts, carbonates, are explored. review, categorized by nature agent, aids researchers selecting suitable methods for N‐alkylation.

Язык: Английский

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Cp*Ir complex bearing a flexible bridging and functional 2,2′-methylenebibenzimidazole ligand as an auto-tandem catalyst for the synthesis of N-methyl tertiary amines from imines via transfer hydrogenation/N-methylation with methanol

Journal of Catalysis, Год журнала: 2021, Номер 402, С. 325 - 334

Опубликована: Авг. 26, 2021

Язык: Английский

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Structurally Well-Defined PC(sp³)P Osmium Pincer Catalysts for Methylation of Alcohols, Indoles, Phenols, and Sulfonamides Using Methanol as a C₁ Source

ACS Catalysis, Год журнала: 2024, Номер 14(3), С. 1629 - 1638

Опубликована: Янв. 17, 2024

Recent findings show pincer catalysts of osmium superior in a broad spectrum synthetically valuable transformations. This article reports structurally well-defined Os(II)PCsp3P complexes stabilized by functional dibenzobarrelene-based ligand. We describe their organometallic and catalytic properties the hydride transfer reactions. demonstrate that center, covalently locked within 3-dimensional ligand pocket, exhibits strictly predictable coordination behavior redox rigidity while remaining catalytically active owing to potential cooperation with proximate side arm. The described were found as mild selective methylation alcohols, indoles, phenols, sulfonamides using methanol C1 source.

Язык: Английский

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Recent Development in Synthesis of N‐Methylamines with Amines and Methanol

ChemCatChem, Год журнала: 2024, Номер 16(16)

Опубликована: Март 23, 2024

Abstract The N‐methylation reaction of amines with methanol via the borrowing‐hydrogen strategy is an important method for construction C−N bonds. Compared other C1 sources, such as toxic formaldehyde or expensive formic acid, more suitable reactions due to its eco‐friendliness and low price. Using this strategy, various types N‐methylated products, including biological pharmaceutical molecules have been prepared. Here, we present a thorough survey decades articles showing current developments in methanol. We discuss homogenous, heterogenous light‐driven catalytic systems both N,N‐dimethylation reactions. This review presents shortcomings provides future development progress

Язык: Английский

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Poly(2,2′-Bibenzimidazole)–Supported Iridium Complex: A Recyclable Metal–Polymer Ligand Bifunctional Catalyst for the N-Methylation of Amines with Methanol

Inorganic Chemistry, Год журнала: 2024, Номер 63(32), С. 15072 - 15080

Опубликована: Июль 27, 2024

The design and development of new types catalysts is one the most important topics for modern chemistry. Herein, a polymer-supported iridium complex Cp*Ir@Poly(2,2'-BiBzIm) was designed synthesized by coordinative immobilization [Cp*IrCl

Язык: Английский

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Porous cross-linked polymer copper and iridium catalyzed the synthesis of quinoxalines and functionalized ketones under solvent-free conditions

Materials Chemistry Frontiers, Год журнала: 2021, Номер 5(21), С. 7861 - 7872

Опубликована: Янв. 1, 2021

Two innovative porous cross-linked polymers (PCP–BTA–Ir and PCP–BTA–Cu) exhibited high catalytic activity towards the synthesis quinoxalines.

Язык: Английский

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