10450-11-0

Upstream product

• 108-91-8 cyclohexylamine 
• 4694-88-6 benzooxazole-2-sulfonic acid; potassium salt 
• 615-18-9 2-chloro-1,3-benzoxazole 
• 2382-96-9 benzo[d]oxazole-2-(3H)-thione 
• 538-75-0 dicyclohexyl-carbodiimide 
• 3743-70-2 N-(2-hydroxyphenyl)benzamide 
• 15175-40-3 1-Cyclohexyl-3-(2-hydroxy-phenyl)-thiourea 
• 1850-14-2 tetramethoxymethane 
• 95-55-6 2-amino-phenol 
• 273-53-0 benzoxazole 
• 766-93-8 N-cyclohexylformamide 
• 102675-92-3 2-iodo-1,3-benzoxazole 
• 18879-86-2 cyclohexylaminodithiocarboxylic acid, cyclohexylammonium salt 
• 2382-96-9 2-sulfanyl-1,3-benzoxazole 

Relevant academic research and scientific papers

Organocatalytic Visible Light Enabled SNAr of Heterocyclic Thiols: A Metal-Free Approach to 2-Aminobenzoxazoles and 4-Aminoquinazolines

The direct amination reaction of heterocyclic thiols has been developed in the presence of the nonhazardous photocatalyst Rose Bengal under irradiation of visible light. The reaction provides a straightforward approach to pharmaceutically and synthetically useful 2-aminobenzoxazole and 4-aminoquinazoline derivatives from the corresponding heterocyclic thiols with amines in good to excellent yields. Our photochemical reaction can be successfully adapted into a continuous flow reactor which is applicable for large-scale chemical industry. The key benefits of this reaction include the use of metal-free, low-cost Rose Bengal catalyst and practical operation (ambient temperature, open flask, and undried solvents).

Copper-catalyzed direct amination of benzoxazoles using primary amines as nitrogen sources

A facile, efficient, and simple protocol for direct oxidative C-H amination of benzoxazoles with primary amines through copper-catalyzed C-H bond activation using tert-butyl peroxide (TBP) as oxidant under air has been developed. The reaction proceeds smoothly at ambient temperature to furnish the products. A variety of substituted aminobenzoxazoles were synthesized with good to excellent yields.

A convenient one-pot synthesis of N-substituted 2-aminoazole derivatives

A practical protocol for the one-pot synthesis of N-substituted 2-aminoazole derivatives is described, employing simple azole substrates, nitrogen nucleophiles, lithium tert-butoxide as the base, and iodine to mediate carbon-nitrogen bond formation. This method proceeds at room temperature under an air atmosphere using a normal benchtop set-up, or can be performed conveniently using microwave irradiation. Georg Thieme Verlag Stuttgart - New York.

Room-Temperature Amination of Chloroheteroarenes in Water by a Recyclable Copper(II)-Phosphaadamantanium Sulfonate System

Buchwald-Hartwig amination of chloroheteroarenes has been a challenging synthetic process, with very few protocols promoting this important transformation at ambient temperature. The current report discusses about an efficient copper-based catalytic system (Cu/PTABS) for the amination of chloroheteroarenes at ambient temperature in water as the sole reaction solvent, a combination that is first to be reported. A wide variety of chloroheteroarenes could be coupled efficiently with primary and secondary amines as well as selected amino acid esters under mild reaction conditions. Catalytic efficiency of the developed protocol also promotes late-stage functionalization of active pharmaceutical ingredients (APIs) such as antibiotics (floxacins) and anticancer drugs. The catalytic system also performs efficiently at a very low concentration of 0.0001 mol % (TON = 980,000) and can be recycled 12 times without any appreciable loss in activity. Theoretical calculations reveal that the π-acceptor ability of the ligand PTABS is the main reason for the appreciably high reactivity of the catalytic system. Preliminary characterization of the catalytic species in the reaction was carried out using UV-VIS and ESR spectroscopy, providing evidence for the Cu(II) oxidation state.

Microwave-assisted hydrogen peroxide-mediated synthesis of benzoxazoles and related heterocycles via cyclodesulfurization

A novel approach has been developed to construct benzoxazoles and similar N- and S-containing heterocycles from their corresponding isothiocyanates and o-substituted anilines via cyclodesulfurization. The reaction was found to proceed via in situ formatio

Zwitterionic Ring-Opened Oxyphosphonium Species from the Ph3P-I2 Mediated Reactions of Benzo[ d]oxazol-2(3 H)-ones with Secondary Amines

Instead of the expected substituted 2-aminobenzo[d]oxazoles, relatively stable ring-opened oxyphosphonium betaines were isolated for the first time from the Ph3P-I2-mediated reactions of benzo[d]oxazol-2(3H)-ones with acyclic seconda

Electrochemical NaI/NaCl-mediated one-pot synthesis of 2-aminobenzoxazoles in aqueous mediaviatandem addition-cyclization

An electrochemical synthesis of 2-aminobenzoxazoles from 2-aminophenols and isothiocyanates was successfully developed in a one-pot fashion. Using inexpensive and widely available NaI and NaCl co-operatively in catalytic amounts, our electrosynthesis approach provided various 2-aminobenzoxazole products in moderate to high yields in an open-flask type undivided cell without using any external supporting electrolyte and base. The protocol can be applied to the synthesis of 2-aminobenzothiazoles from the corresponding 2-thiophenols in moderate yields. This protocol has many benefits. It is metal-free and highly scalable and uses inexpensive mediators and EtOH/water as an environmentally friendly solvent under mild conditions.

Synthesis of Diverse Nitrogen Heterocycles via Palladium-Catalyzed Tandem Azide–Isocyanide Cross-Coupling/Cyclization: Mechanistic Insight using Experimental and Theoretical Studies

A rapid and elegant tandem azide–isocyanide cross-coupling/cyclization protocol has been developed based on a nitrene transfer reaction. The palladium-catalyzed ligand-free methodology led to the synthesis of three different heterocyclic scaffolds with excellent atom/step/redox economy. Studies based on first-principles-based quantum calculations and control experiments unraveled a concerted process of nitrene transfer reaction on isocyanides, ruling out the metallaaziridine intermediate reported earlier. This finding could pave the way for novel applications of nitrene transfer reactions to generate bioactive heterocycles. (Figure presented.).

Transition metal-free direct amination of benzoxazoles using formamides as nitrogen sources

A transition metal-free method for the direct amination of benzoxazoles using formamides as nitrogen sources is reported, which was mediated by an inexpensive and environmentally friendly tetrabutylammonium iodide/tert-butyl hydroperoxide system and gave the 2-aminobenzoxazole derivatives with moderate to good yields.

Utilization of carbon disulfide as a powerful building block for the synthesis of 2-aminobenzoxazoles

This protocol describes a novel, mild and convenient route to afford 2-aminobenzoxazoles in high yields, and represents a significant advance towards an environmentally friendly strategy. Aliphatic amines are made to react with carbon disulfide to provide intermediate dithiocarbamates (DTC), which in the presence of 2-aminophenol, subsequently undergo successive intermolecular nucleophilic attack and desulfurization to produce 2-aminobenzoxazoles within 3 h.