Kalicharan Das
Indian Institute of Technology Guwahati
5 Papers
Kalicharan Das is an academic researcher from Indian Institute of Technology Guwahati. The author has contributed to research in topics: Catalysis & Chemistry. The author has an hindex of 5, co-authored 5 publications.
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Papers
Selective Synthesis of 2-Substituted and 1,2-Disubstituted Benzimidazoles Directly from Aromatic Diamines and Alcohols Catalyzed by Molecularly Defined Nonphosphine Manganese(I) Complex.
TL;DR: This work presents a selective synthesis of 2-substituted and 1,2-disubstituting benzimidazoles by acceptorless dehydrogenative coupling of aromatic diamine with primary alcohols by phosphine-free tridentate NNS ligand-derived manganese(I) complex.
140
Sustainable Synthesis of Quinazoline and 2-Aminoquinoline via Dehydrogenative Coupling of 2-Aminobenzyl Alcohol and Nitrile Catalyzed by Phosphine-Free Manganese Pincer Complex.
TL;DR: A one-pot synthetic strategy for the synthesis of 2-alkylaminoquinolines through sequential dehydrogenative annulation and N-alkylation reaction has also been demonstrated.
105
Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1H-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
TL;DR: The application of nontoxic, earth-abundant transition metals in place of costly noble metals is a paramount goal in catalysis and is especially interesting if the air-and moisture-stable ligand s... as discussed by the authors.
88
Phosphine free Mn-complex catalysed dehydrogenative C–C and C–heteroatom bond formation: a sustainable approach to synthesize quinoxaline, pyrazine, benzothiazole and quinoline derivatives
TL;DR: The first sustainable synthesis of quinoxalines, pyrazines and benzothiazoles catalysed by a phosphine free Mn(i) complex via acceptorless dehydrogenative coupling (ADC) is reported.
Acceptorless dehydrogenative construction of C[double bond, length as m-dash]N and C[double bond, length as m-dash]C bonds through catalytic aza-Wittig and Wittig reactions in the presence of an air-stable ruthenium pincer complex.
TL;DR: This expeditious protocol was successfully applied to construct a C[double bond, length as m-dash]C bond directly from alcohol via dehydrogenative Wittig reaction and the synthesis of structurally important pyrrolo[1,4]benzodiazepine derivatives was also achieved by this methodology.