Sustainable Synthesis of Quinazoline and 2-Aminoquinoline via Dehydrogenative Coupling of 2-Aminobenzyl Alcohol and Nitrile Catalyzed by Phosphine-Free Manganese Pincer Complex

2019 ◽  
Vol 21 (9) ◽  
pp. 3223-3227 ◽  
Author(s):  
Kalicharan Das ◽  
Avijit Mondal ◽  
Debjyoti Pal ◽  
Dipankar Srimani
Keyword(s):  
Dehydrogenative Coupling ◽  
Pincer Complex

Direct access toN-alkylated amines and iminesviaacceptorless dehydrogenative coupling catalyzed by a cobalt(ii)-NNN pincer complex

2018 ◽  
Vol 8 (14) ◽  
pp. 3469-3473 ◽  
Author(s):  
Siba P. Midya ◽  
Jayaraman Pitchaimani ◽  
Vinod G. Landge ◽  
Vedichi Madhu ◽  
Ekambaram Balaraman
Keyword(s):  
Molecular Hydrogen ◽  
Direct Access ◽  
Dehydrogenative Coupling ◽  
Pincer Complex

A Co(ii)-NNN pincer complex catalyzed directN-alkylation of anilines with alcoholsviahydrogen auto-transfer and selective acceptorless dehydrogenative coupling of benzylamines with alcohols affording imines with the liberation of molecular hydrogen and water is reported.

Direct Synthesis of Amides by Dehydrogenative Coupling of Amines with either Alcohols or Esters: Manganese Pincer Complex as Catalyst

2017 ◽  
Vol 56 (47) ◽  
pp. 14992-14996 ◽  
Author(s):  
Amit Kumar ◽  
Noel Angel Espinosa-Jalapa ◽  
Gregory Leitus ◽  
Yael Diskin-Posner ◽  
Liat Avram ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Dehydrogenative Coupling ◽  
Pincer Complex

scholarly journals Manganese Catalysed Dehydrogenative Synthesis of Urea Derivatives and Polyureas

2021 ◽  
Author(s):  
Aniekan Owen ◽  
Annika Preiss ◽  
Angus McLuskie ◽  
Chang Gao ◽  
Gavin Peters ◽  
...  
Keyword(s):  
Pharmaceutical Drugs ◽  
Urea Derivatives ◽  
Coupling Process ◽  
Dehydrogenative Coupling ◽  
Pincer Complex ◽  
Reaction Proceeds ◽  
Earth Abundant ◽  
Broad Variety ◽  
Resin Precursors ◽  
A Current

Urea derivatives are prevalent intermediates in the synthesis of resin precursors, dyes, agrochemicals, and pharmaceutical drugs. Furthermore, polyureas are useful plastics with applications in coating, adhesive, and biomedical industries and have a current annual market of USD 885 million. However, the conventional methods for the synthesis of urea derivatives and polyureas involve toxic reagents such as (di)isocyanates, phosgene, CO, and azides. We present here the synthesis of (poly)ureas using much less toxic reagents - (di)amines, and methanol via a catalytic dehydrogenative coupling process. The reaction is catalyzed by a pincer complex of an earth-abundant metal, manganese, and liberates H2 gas, valuable by itself, as the only by-product making the overall process atom-economic, and sustainable. A broad variety of symmetrical, and unsymmetrical urea derivatives and polyureas have been synthesized in moderate to quantitative yields using this catalytic protocol. Mechanistic insights have also been provided using experiments and DFT computation suggesting that the reaction proceeds via an isocyanate intermediate.

Synthesis of Cyclic Imides by Acceptorless Dehydrogenative Coupling of Diols and Amines Catalyzed by a Manganese Pincer Complex

2017 ◽  
Vol 139 (34) ◽  
pp. 11722-11725 ◽  
Author(s):  
Noel Angel Espinosa-Jalapa ◽  
Amit Kumar ◽  
Gregory Leitus ◽  
Yael Diskin-Posner ◽  
David Milstein
Keyword(s):  
Dehydrogenative Coupling ◽  
Pincer Complex ◽  
Cyclic Imides

Direct Synthesis of Amides by Dehydrogenative Coupling of Amines with either Alcohols or Esters: Manganese Pincer Complex as Catalyst

2017 ◽  
Vol 129 (47) ◽  
pp. 15188-15192 ◽  
Author(s):  
Amit Kumar ◽  
Noel Angel Espinosa-Jalapa ◽  
Gregory Leitus ◽  
Yael Diskin-Posner ◽  
Liat Avram ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Dehydrogenative Coupling ◽  
Pincer Complex

Thermally-Induced Dehydrogenative Coupling of Organosilanes and H-Terminated Silicon Quantum Dots onto Germanane Surfaces

2020 ◽  
Author(s):  
Haoyang Yu ◽  
Alyxandra Thiessen ◽  
Md Asjad Hossain ◽  
Marc Julian Kloberg ◽  
Bernhard Rieger ◽  
...  
Keyword(s):  
2D Materials ◽  
Future Generation ◽  
Optical Devices ◽  
Surface Reactivity ◽  
Organic Monolayers ◽  
Present Contribution ◽  
Thermally Induced ◽  
Dehydrogenative Coupling ◽  
Silicon Quantum Dot ◽  
Covalently Bonded

<div><div><div><p>Covalently bonded organic monolayers play important roles in defining the solution processability, ambient stability, and electronic properties of two-dimensional (2D) materials such as Ge nanosheets (GeNSs); they also hold promise of providing avenues for the fabrication of future generation electronic and optical devices. Functionalization of GeNS normally involves surface moieties linked through covalent Ge−C bonds. In the present contribution we extend the scope of surface linkages to include Si−Ge bonding and present the first demonstration of heteronuclear dehydrocoupling of organosilanes to hydride-terminated GeNSs obtained from the deintercalation and exfoliation of CaGe2. We further exploit this new surface reactivity and demonstrated the preparation of directly bonded silicon quantum dot-Ge nanosheet hybrids.</p></div></div></div>

Transition-Metal-Free Synthetic Strategies for the Cross-Coupling Reactions in Water: A Green Approach

2020 ◽  
Vol 07 ◽  
Author(s):  
Tanmay Chatterjee ◽  
Nilanjana Mukherjee
Keyword(s):  
Transition Metal ◽  
Organic Solvents ◽  
Aqueous Media ◽  
Cross Coupling ◽  
Transition Metal Catalysts ◽  
Synthetic Methods ◽  
Coupling Reactions ◽  
Organic Transformations ◽  
Green Approach ◽  
Dehydrogenative Coupling

Abstract: A natural driving force is always working behind the synthetic organic chemists towards the development of ‘green’ synthetic methodologies for the synthesis of useful classes of organic molecules having potential applications. The majority of the essential classes of organic transformations, including C-C and C-X (X = heteroatom) bond-forming crosscoupling reactions, cross dehydrogenative-coupling (CDC) mostly rely on the requirement of transition-metal catalysts and hazardous organic solvents. Hence, the scope in developing green synthetic strategies by avoiding the use of transitionmetal catalysts and hazardous organic solvents for those important and useful classes of organic transformations is very high. Hence, several attempts are made so far. Water being the most abundant, cheap, and green solvent in the world; numerous synthetic methods have been developed in an aqueous medium. In this review, the development of transitionmetal- free green synthetic strategies for various important classes of organic transformations such as C-C and C-X bondforming cross-coupling, cross dehydrogenative-coupling, and oxidative-coupling in an aqueous media is discussed.

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