Half-sandwich (η5-Cp*)Rh(iii) complexes of pyrazolated organo-sulfur/selenium/tellurium ligands: efficient catalysts for base/solvent free C–N coupling of chloroarenes under aerobic conditions

2020 ◽  
Vol 18 (18) ◽  
pp. 3599-3606 ◽  
Author(s):  
Charu Sharma ◽  
Avinash Kumar Srivastava ◽  
Kamal Nayan Sharma ◽  
Raj Kumar Joshi
Keyword(s):  
Solvent Free ◽  
Co Catalyst ◽  
Aerobic Conditions ◽  
Aryl Chlorides ◽  
Type C ◽  
Half Sandwich

Three new Rh(iii) complexes of organochalcogen (S/Se/Te) ligands were synthesized and along with a co-catalyst Cu(OAc)2, used for the base/solvent free catalysis of Buchwald type C–N coupling of amines and aryl chlorides under aerobic conditions.

scholarly journals Correction: Half-sandwich (η5-Cp*)Rh(iii) complexes of pyrazolated organo-sulfur/selenium/tellurium ligands: efficient catalysts for base/solvent free C–N coupling of chloroarenes under aerobic conditions

2020 ◽  
Vol 18 (25) ◽  
pp. 4872-4872
Author(s):  
Charu Sharma ◽  
Avinash Kumar Srivastava ◽  
Kamal Nayan Sharma ◽  
Raj Kumar Joshi
Keyword(s):  
Solvent Free ◽  
Aerobic Conditions ◽  
Half Sandwich

Correction for ‘Half-sandwich (η5-Cp*)Rh(iii) complexes of pyrazolated organo-sulfur/selenium/tellurium ligands: efficient catalysts for base/solvent free C–N coupling of chloroarenes under aerobic conditions’ by Charu Sharma et al., Org. Biomol. Chem., 2020, 18, 3599–3606, DOI: 10.1039/D0OB00538J.

Cp*Co(iii) and Cu(OAc)2 bimetallic catalysis for Buchwald-type C–N cross coupling of aryl chlorides and amines under base, inert gas & solvent-free conditions

2020 ◽  
Vol 22 (23) ◽  
pp. 8248-8253
Author(s):  
Avinash K. Srivastava ◽  
Charu Sharma ◽  
Raj K. Joshi
Keyword(s):  
Cross Coupling ◽  
Solvent Free ◽  
Inert Gas ◽  
Coupling Reactions ◽  
Bimetallic Catalysis ◽  
Aryl Chlorides ◽  
Solvent Free Conditions ◽  
Type C

A strategy involving bimetallic catalysis which requires a combination of Cp*Co(CO)I2 and Cu(OAc)2 was used to perform Buchwald-type C–N coupling reactions of aryl chlorides with amines.

scholarly journals Organophotocatalytic selective deuterodehalogenation of aryl or alkyl chlorides

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanjun Li ◽  
Ziqi Ye ◽  
Yu-Mei Lin ◽  
Yan Liu ◽  
Yumeng Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Sodium Formate ◽  
Bioactive Molecules ◽  
Co Catalyst ◽  
Aryl Chlorides ◽  
Aryl Amine ◽  
Drug Molecules ◽  
Photocatalytic System ◽  
Site Selective ◽  
Environmentally Friendly Method

AbstractDevelopment of practical deuteration reactions is highly valuable for organic synthesis, analytic chemistry and pharmaceutic chemistry. Deuterodehalogenation of organic chlorides tends to be an attractive strategy but remains a challenging task. We here develop a photocatalytic system consisting of an aryl-amine photocatalyst and a disulfide co-catalyst in the presence of sodium formate as an electron and hydrogen donor. Accordingly, many aryl chlorides, alkyl chlorides, and other halides are converted to deuterated products at room temperature in air (>90 examples, up to 99% D-incorporation). The mechanistic studies reveal that the aryl amine serves as reducing photoredox catalyst to initiate cleavage of the C-Cl bond, at the same time as energy transfer catalyst to induce homolysis of the disulfide for consequent deuterium transfer process. This economic and environmentally-friendly method can be used for site-selective D-labeling of a number of bioactive molecules and direct H/D exchange of some drug molecules.

Copper(ii) carboxymethylcellulose (CMC-CuII) as an efficient catalyst for aldehyde–alkyne–amine coupling under solvent-free conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 94399-94407 ◽  
Author(s):  
Xiaoping Liu ◽  
Bijin Lin ◽  
Zhuan Zhang ◽  
Hao Lei ◽  
Yiqun Li
Keyword(s):  
Solvent Free ◽  
Efficient Catalyst ◽  
Co Catalyst ◽  
Solvent Free Conditions ◽  
A3 Coupling ◽  
Amine Coupling

A novel heterogeneous Cu(ii) carboxymethylcellulose catalyst was prepared and successfully employed in the A3 coupling without using any co-catalyst, other additives, bases under solvent-free conditions.

Use of (R)-Mandelic Acid as Chiral Co-Catalyst in the Michael Addition Reaction Organocatalyzed by (1S,4S)-2-Tosyl-2,5-diazabicyclo[2.2.1]heptane under Solvent-Free Conditions

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
C. Gabriela Ávila-Ortiz ◽  
Manuel López-Ortiz ◽  
Alberto Vega-Peñaloza ◽  
Ignacio Regla ◽  
Eusebio Juaristi
Keyword(s):  
Michael Addition ◽  
Mandelic Acid ◽  
Addition Reaction ◽  
Solvent Free ◽  
Reaction Intermediates ◽  
Michael Addition Reaction ◽  
Co Catalyst ◽  
Co Catalysts ◽  
Solvent Free Conditions ◽  
The Michael Addition

AbstractThis article describes a study on the Michael addition reaction of cyclohexanone to nitroolefins catalyzed by the chiral secondary amine (1S,4S)-2-tosyl- 2,5-diazabicyclo[2.2.1]heptane. Reactions were carried out under solvent-free conditions to make them more environmentally friendly. Initially, the observed diastereoand enantioselectivities were moderate to good, but were significantly improved by lowering the reaction temperature. Furthermore, a variety of chiral acids were also tested as co-catalysts in both of their enantiomeric forms, which revealed that (R)-mandelic acid affords excellent results in terms of yield and stereoselectivity. Monitoring the reaction by MS-TOF allowed for the detection of key reaction intermediates, and a reasonable reaction mechanism in which both catalysts are involved is proposed.

Catalytic amounts of CBr4 mediated dehydrogenative coupling of isochromans with aromatic ketones

2015 ◽  
Vol 51 (22) ◽  
pp. 4708-4711 ◽  
Author(s):  
Congde Huo ◽  
Mingxia Wu ◽  
Fengjuan Chen ◽  
Xiaodong Jia ◽  
Yong Yuan ◽  
...  
Keyword(s):  
Solvent Free ◽  
Aromatic Ketones ◽  
Aerobic Conditions ◽  
Metal Free ◽  
Dehydrogenative Coupling

In the presence of catalytic amounts of CBr4 (a metal-free mediator), an unexpected oxidative dehydrogenative coupling of isochromans with ketones occurred to construct new Csp3–Csp3 bonds. The reactions were performed under simple solvent-free aerobic conditions.

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