A Triazole-Substituted Aryl Iodide with Omnipotent Reactivity in Enantioselective Oxidative Couplings

2019 ◽  
Author(s):  
Ayham Abazid ◽  
Boris Nachtsheim
Keyword(s):  
Dft Calculations ◽  
Oxidative Coupling ◽  
Coupling Reactions ◽  
Efficient Catalyst ◽  
Aryl Iodide ◽  
Oxidative Coupling Reactions

A triazole-substituted chiral aryl iodide is described as an efficient catalyst for a variety of diverse oxidative coupling reactions such as the Kita-spirocyclization, phenol-dearomatizations, alpha-oxygenations and oxidative rearrangements. Structures of the in situ oxidized hydroxy(tosyloxy)iodoarenes are discussed based on DFT-calculations.<br>

A Triazole-Substituted Aryl Iodide with Omnipotent Reactivity in Enantioselective Oxidative Couplings

2019 ◽  
Author(s):  
Ayham Abazid ◽  
Boris Nachtsheim
Keyword(s):  
Dft Calculations ◽  
Oxidative Coupling ◽  
Coupling Reactions ◽  
Efficient Catalyst ◽  
Aryl Iodide ◽  
Oxidative Coupling Reactions

A triazole-substituted chiral aryl iodide is described as an efficient catalyst for a variety of diverse oxidative coupling reactions such as the Kita-spirocyclization, phenol-dearomatizations, alpha-oxygenations and oxidative rearrangements. Structures of the in situ oxidized hydroxy(tosyloxy)iodoarenes are discussed based on DFT-calculations.<br>

scholarly journals Enantioselective Iron/Bisquinolyldiamine Ligand-Catalyzed Oxidative Coupling Reaction of 2-Naphthols

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 852 ◽  
Author(s):  
Lin-Yang Wu ◽  
Muhammad Usman ◽  
Wen-Bo Liu
Keyword(s):  
Oxidative Coupling ◽  
Coupling Reaction ◽  
Iron Complex ◽  
Coupling Reactions ◽  
Oxidative Coupling Reaction ◽  
Oxidative Coupling Reactions

An iron-catalyzed asymmetric oxidative homo-coupling of 2-naphthols for the synthesis of 1,1′-Bi-2-naphthol (BINOL) derivatives is reported. The coupling reaction provides enantioenriched BINOLs in good yields (up to 99%) and moderate enantioselectivities (up to 81:19 er) using an iron-complex generated in situ from Fe(ClO4)2 and a bisquinolyldiamine ligand [(1R,2R)-N1,N2-di(quinolin-8-yl)cyclohexane-1,2-diamine, L1]. A number of ligands (L2–L8) and the analogs of L1, with various substituents and chiral backbones, were synthesized and examined in the oxidative coupling reactions.

Potassium Periodate Mediated Oxidative Cyclodesulfurization toward Benzofused Nitrogen Heterocycles

Synthesis ◽  
2020 ◽  
Vol 52 (13) ◽  
pp. 1981-1990
Author(s):  
Mookda Pattarawarapan ◽  
Chuthamat Duangkamol ◽  
Wong Phakhodee
Keyword(s):  
Intramolecular Cyclization ◽  
Oxidative Coupling ◽  
Nitrogen Heterocycles ◽  
Coupling Reactions ◽  
Substituted Anilines ◽  
Potassium Periodate ◽  
High Yields ◽  
Quinazolinone Derivatives ◽  
Oxidative Coupling Reactions

A convenient oxidative cyclodesulfurization method toward the synthesis of benzofused nitrogen heterocycles using inexpensive and readily available potassium periodate as an oxidant was developed. Upon treating isothiocyanates with ortho-substituted anilines bearing N,N-, N,O-, and N,S-bis-nucleophiles, followed by an intramolecular cyclization of the in situ generated monothioureas, substituted 2-aminobenzazole series were rapidly accessible in good to excellent yields. The protocol can accommodate various substituents on both substrates while allowing more efficient, greener, and operational simpler process relative to other oxidative coupling reactions. Tetracyclic quinazolinone derivatives were also afforded in high yields in a single preparative step and chromatography-free.

An Unprecedented Cyano-Induced Sodium Nitrite-Catalyzed C(sp3)-H and C(sp2)-H Coupling Reaction

2018 ◽  
Vol 15 (7) ◽  
pp. 989-994 ◽  
Author(s):  
Ling Li ◽  
Bo Su ◽  
Yuxiu Liu ◽  
Qingmin Wang
Keyword(s):  
Sodium Nitrite ◽  
Oxidative Coupling ◽  
High Resolution Mass Spectrometry ◽  
Coupling Reaction ◽  
13C Nmr Spectroscopy ◽  
Coupling Reactions ◽  
Reaction Conditions ◽  
1H And 13C Nmr ◽  
Oxidative Coupling Reaction ◽  
Oxidative Coupling Reactions

Aim and Objective: During the investigation of sodium nitrite-catalyzed oxidative coupling reaction of aryls, an unprecedented C(sp2)-H and C(sp3)-H coupling of substituted 2-aryl acetonitrile was found. Materials and Methods: The structure of the coupled product was confirmed by 1H and 13C NMR spectroscopy and high-resolution mass spectrometry (HRMS), and comparison of its derivatives with known compounds. The effects of methoxy group in the benzene ring on the reaction were evaluated. Results: The optimized reaction conditions are summarized as follows: CF3SO3H/substrate = 1.5 equiv., NaNO2/substrate = 0.3 equiv., CH3CN as solvent. 2-(4-Methoxyphenyl)acetonitrile and 2-(3,4,5- trimethoxyphenyl)acetonitrile could also generate C(sp2)-H and C(sp3)-H coupling. The coupling reaction occurred as a typical radial mechanism. Conclusion: An unprecedented cyano-induced, NaNO2-catalyzed oxidative C(sp3)-H and C(sp2)-H coupling was reported. The reaction proceeded under very mild conditions, using O2 in the air as terminal oxidant. The unique oxidative manner might provide more inspiration for the development of intriguing oxidative coupling reactions.

An easily prepared palladium-hydrogel nanocomposite catalyst for C–C coupling reactions

2014 ◽  
Vol 2 (44) ◽  
pp. 18952-18958 ◽  
Author(s):  
Mitasree Maity ◽  
Uday Maitra
Keyword(s):  
Palladium Nanoparticles ◽  
Room Temperature ◽  
Coupling Reaction ◽  
Coupling Reactions ◽  
Sodium Cyanoborohydride ◽  
Efficient Catalyst ◽  
Suzuki Coupling Reaction ◽  
Reaction In Water ◽  
Hydrogel Nanocomposite

Palladium nanoparticles were efficiently prepared in situ by sodium cyanoborohydride reduction of Pd(ii) at room temperature using calcium-cholate hydrogel fibers as templates. The PdNPs self-organize on the gel fibers, which supports the controlled growth as well as stabilization of PdNPs. The hybrid xerogel was used as an efficient catalyst for the Suzuki coupling reaction in water.

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