The Experts below are selected from a list of 1290 Experts worldwide ranked by ideXlab platform
Buddhadeb Chattopadhyay - One of the best experts on this subject based on the ideXlab platform.
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Novel Synthesis of Heterocycle-AnnulatedAzocine Derivatives of Biological Relevance by Aromatic Aza-ClaisenRearrangement and Intramolecular Heck Reaction
Synthesis, 2010Co-Authors: Raj Kumar Nandi, Srikanta Samanta, Buddhadeb ChattopadhyayAbstract:A synthetic strategy based on the sequential application of an aromatic aza-Claisen rearrangement and an Intramolecular Heck Reaction sequence as the key steps has been developed for the synthesis of various hitherto unreported coumarin- and quinolone-annulated benzazocine derivatives in excellent yields.
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pd 0 catalyzed Intramolecular Heck Reaction a versatile route for the synthesis of dibenzoazocinone derivatives
Tetrahedron Letters, 2009Co-Authors: Kaushik Majumdar, Srikanta Samanta, Buddhadeb ChattopadhyayAbstract:Abstract Two efficacious synthetic methodologies for the construction of medium-sized nitrogen heterocycles dibenzoazocinones have been developed. The phosphine-assisted protocol afforded better yields of the dibenzoazocinones (73–82%).
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Synthesis of highly substituted dibenzoazocine derivatives by the aza-Claisen rearrangement and Intramolecular Heck Reaction via 8-exo-trig mode of cyclization
Tetrahedron Letters, 2009Co-Authors: Buddhadeb Chattopadhyay, Srikanta SamantaAbstract:The synthesis of highly substituted dibenzo-azocine systems is still lacking. An efficient synthetic protocol utilizing the sequential aromatic aza-Claisen rearrangement followed by the implementation of the Intramolecular Heck Reaction as a key step has been developed for the synthesis of various dibenzo-azocine derivatives of biological relevance.
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new Heck coupling strategies for the arylation of secondary and tertiary amides via palladium catalyzed Intramolecular cyclization
Tetrahedron Letters, 2008Co-Authors: K C Majumdar, Buddhadeb Chattopadhyay, Sanjay NathAbstract:A new synthetic protocol has been developed for the arylation of secondary and N-alkylated amide Heck precursors by the implementation of the palladium-catalyzed Intramolecular Heck Reaction strategies.
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novel synthesis of oxocine derivatives by wittig olefination and Intramolecular Heck Reaction via 8 endo trig cyclization
Tetrahedron Letters, 2008Co-Authors: K C Majumdar, Buddhadeb Chattopadhyay, Biswajit SinhaAbstract:A concise and efficient method for the preparation of oxocine derivatives is described via sequential Wittig and Intramolecular Heck Reactions. The method is highly regioselective and affords high yields of the products.
Srikanta Samanta - One of the best experts on this subject based on the ideXlab platform.
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synthesis of coumarin and quinolone annulated benzazocinone frameworks by a palladium catalyzed Intramolecular Heck Reaction
ChemInform, 2012Co-Authors: Kaushik Majumdar, Srikanta Samanta, Tapas GhoshAbstract:The efficient process is extended to the structurally related naphthalene derivative (III).
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Synthesis of Coumarin- and Quinolone-Annulated Benzazocinone Frameworks by a Palladium-Catalyzed Intramolecular Heck Reaction
Synthesis, 2012Co-Authors: Srikanta Samanta, Tapas GhoshAbstract:A synthetic strategy based on the sequential application of an aromatic aza-Claisen rearrangement and an Intramolecular Heck Reaction as the key steps has been developed for the synthesis of various new coumarin- and quinolone-annulated benzazocinone derivatives in 60–70% yields.
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Facile Synthesis of Coumarin- and Quinolone-Annulated Benzazoninone Derivatives by an Intramolecular Heck Reaction Strategy via 9-exo-trig Cyclization
Synthesis, 2011Co-Authors: Tapas Ghosh, Srikanta SamantaAbstract:A synthetic strategy based on the application of the aromatic aza-Claisen rearrangement followed by an Intramolecular Heck Reaction sequence as the key step has been developed for the regiocontrolled synthesis of hitherto unreported coumarin- and quinolone-annulated benzazoninone derivatives in 48―69% yield.
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Novel Synthesis of Heterocycle-AnnulatedAzocine Derivatives of Biological Relevance by Aromatic Aza-ClaisenRearrangement and Intramolecular Heck Reaction
Synthesis, 2010Co-Authors: Raj Kumar Nandi, Srikanta Samanta, Buddhadeb ChattopadhyayAbstract:A synthetic strategy based on the sequential application of an aromatic aza-Claisen rearrangement and an Intramolecular Heck Reaction sequence as the key steps has been developed for the synthesis of various hitherto unreported coumarin- and quinolone-annulated benzazocine derivatives in excellent yields.
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pd 0 catalyzed Intramolecular Heck Reaction a versatile route for the synthesis of dibenzoazocinone derivatives
Tetrahedron Letters, 2009Co-Authors: Kaushik Majumdar, Srikanta Samanta, Buddhadeb ChattopadhyayAbstract:Abstract Two efficacious synthetic methodologies for the construction of medium-sized nitrogen heterocycles dibenzoazocinones have been developed. The phosphine-assisted protocol afforded better yields of the dibenzoazocinones (73–82%).
K C Majumdar - One of the best experts on this subject based on the ideXlab platform.
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synthesis of benzodiazocine annulated heterocycles by the implementation of pd catalyzed Intramolecular Heck Reaction
ChemInform, 2010Co-Authors: K C Majumdar, Krishanu Ray, Sintu GanaiAbstract:Abstract Synthesis of hitherto unreported benzodiazocine-annulated heterocycles by the implementation of palladium-catalyzed Intramolecular Heck Reaction has been achieved in excellent yields.
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novel synthesis of nine membered oxa heterocycles by pd 0 catalyzed Intramolecular Heck Reaction via unusual 9 endo trig mode cyclization
ChemInform, 2008Co-Authors: K C Majumdar, B ChattopadhyayAbstract:Syntheses of nine-membered oxa-heterocyclic compounds by the application of the Intramolecular Heck Reaction have been difficult to develop. Herein, we describe the synthesis of this class of compounds through the 9- ENDO- TRIG cyclization and 8- ENDO- TRIG cyclization, respectively - a rare mode of cyclization in the literature.
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new Heck coupling strategies for the arylation of secondary and tertiary amides via palladium catalyzed Intramolecular cyclization
Tetrahedron Letters, 2008Co-Authors: K C Majumdar, Buddhadeb Chattopadhyay, Sanjay NathAbstract:A new synthetic protocol has been developed for the arylation of secondary and N-alkylated amide Heck precursors by the implementation of the palladium-catalyzed Intramolecular Heck Reaction strategies.
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novel synthesis of oxocine derivatives by wittig olefination and Intramolecular Heck Reaction via 8 endo trig cyclization
Tetrahedron Letters, 2008Co-Authors: K C Majumdar, Buddhadeb Chattopadhyay, Biswajit SinhaAbstract:A concise and efficient method for the preparation of oxocine derivatives is described via sequential Wittig and Intramolecular Heck Reactions. The method is highly regioselective and affords high yields of the products.
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novel synthesis of medium sized oxa heterocycles by palladium catalyzed Intramolecular Heck Reaction
Tetrahedron Letters, 2007Co-Authors: K C Majumdar, Buddhadeb Chattopadhyay, Krishanu RayAbstract:Abstract An efficient and high yielding method for the synthesis of eight-membered heterocyclic skeletons has been developed via palladium-catalyzed Intramolecular Heck Reaction.
Neerja Yadavbhatnagar - One of the best experts on this subject based on the ideXlab platform.
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synthesis of novel poly ethylene glycol supported benzazepines the crucial role of peg on the selectivity of an Intramolecular Heck Reaction
Tetrahedron, 2006Co-Authors: Patrice Ribiere, Valerie Declerck, Yannig Nedellec, Neerja YadavbhatnagarAbstract:Poly(ethylene glycol) (PEG 3400) was used as a soluble polymeric support for the synthesis of a series of novel benzazepines. The key step for the preparation of these heterocycles was a phosphine-free palladium-catalyzed Heck Reaction. Palladium nanoparticles formed during the course of the Reaction were characterized. The presence of PEG 3400 influenced the outcome of the Reaction in terms of selectivity.
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synthesis of novel poly ethylene glycol supported benzazepines the crucial role of peg on the selectivity of an Intramolecular Heck Reaction
Tetrahedron, 2006Co-Authors: Patrice Ribiere, Valerie Declerck, Yannig Nedellec, Neerja Yadavbhatnagar, Jean Martinez, Frederic LamatyAbstract:Poly(ethylene glycol) (PEG 3400) was used as a soluble polymeric support for the synthesis of a series of novel benzazepines. The key step for the preparation of these heterocycles was a phosphine-free palladium-catalyzed Heck Reaction. Palladium nanoparticles formed during the course of the Reaction were characterized. The presence of PEG 3400 influenced the outcome of the Reaction in terms of selectivity.
Bo Ram Park - One of the best experts on this subject based on the ideXlab platform.
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facile synthesis of benzofulvene derivatives from baylis hillman adducts in mediated barbier Reaction combined with pd 0 catalyzed Intramolecular Heck elimination cascade
Tetrahedron Letters, 2010Co-Authors: Bo Ram ParkAbstract:Abstract A facile synthesis of benzofulvene derivatives was carried out starting from the Baylis–Hillman adducts of 2-bromobenzaldehyde via the sequential bromination, In-mediated Barbier Reaction with aldehyde, acetylation, Pd-catalyzed Intramolecular Heck Reaction, and the elimination of AcOH.