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Antonova YA, Nelyubina YV, Ioffe SL, Tabolin AA. [3+3]-Annulation of Cyclic Nitronates with Vinyl Diazoacetates: Diastereoselective Synthesis of Partially Saturated [1,2]Oxazino[2,3- b][1,2]oxazines and Their Base-Promoted Ring Contraction to Pyrrolo[1,2- b][1,2]oxazine Derivatives. Molecules 2023; 28:molecules28073025. [PMID: 37049788 PMCID: PMC10096057 DOI: 10.3390/molecules28073025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/23/2023] [Accepted: 03/24/2023] [Indexed: 04/14/2023] Open
Abstract
A rhodium(II)-catalyzed reaction of cyclic nitronates (5,6-dihydro-4H-1,2-oxazine N-oxides) with vinyl diazoacetates proceeds as a [3+3]-annulation producing bicyclic unsaturated nitroso acetals (4a,5,6,7-tetrahydro-2H-[1,2]oxazino[2,3-b][1,2]oxazines). Optimization of reaction conditions revealed the use of Rh(II) octanoate as the preferred catalyst in THF at room temperature, which allows the preparation of target products in good yields and excellent diastereoselectivity. Under basic conditions, namely, the combined action of DBU and alcohol, these nitroso acetals undergo ring contraction of an unsaturated oxazine ring into the corresponding pyrrole. Both transformations can be performed in a one-pot fashion, thus constituting a quick approach to oxazine-annulated pyrroles from available starting materials, such as nitroalkenes, olefins, and diazo compounds.
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Affiliation(s)
- Yulia A Antonova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 47, Moscow 119991, Russia
| | - Yulia V Nelyubina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia
| | - Sema L Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 47, Moscow 119991, Russia
| | - Andrey A Tabolin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 47, Moscow 119991, Russia
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Ghosh T, Biswas D, Bhakta S. Palladium-Catalyzed Synthesis of Fused Carbo- and Heterocycles: Recent Advances. Chem Asian J 2022; 17:e202200725. [PMID: 36065137 DOI: 10.1002/asia.202200725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 09/03/2022] [Indexed: 11/10/2022]
Abstract
The use of palladium catalysts in fused ring synthesis has been increasingly noteworthy in recent years in organic synthesis. It has a lot of potential compared to other transition metal catalysts, because of its one-of-a-kind feature that makes them more widely applicable in a variety of disciplines application. Palladium is important in a variety of Heck processes, including intramolecular, intermolecular, and reductive Heck reactions, which produce diverse carbocycles and heterocycles of biological importance. Under optimal reaction conditions, carbocyclization or heterocyclization occurs, resulting in the production of numerous structural building blocks of naturally occurring compounds. Beside intramolecular Heck-type reactions, cycloaddition, cycloalkylation, oxidative coupling, C-H functionalization, cross-coupling reactions, and carboamidation reactions have also been employed extensively to access fused carbo- and heterocycles of immense biological importance. This review article provides a well-summarized discussion (since 2001) on fused carbo- and heterocycle ring synthesis using palladium catalysts, overviewing their applications, and mechanistic insights.
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Affiliation(s)
- Tapas Ghosh
- Maulana Abul Kalam Azad University of Technology, Applied Sciences, Simhat, Haringhata, 741249, Haringhata, INDIA
| | - Diptam Biswas
- Maulana Abul Kalam Azad University of Technology, Applied Chemistry, INDIA
| | - Sayantika Bhakta
- Maulana Abul Kalam Azad University of Technology, Applied Chemistry, INDIA
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Bera A, Patra P, Azad A, Ali SA, Manna SK, Saha A, Samanta S. Neat synthesis of isothiazole compounds, and studies on their synthetic applications and photophysical properties. NEW J CHEM 2022. [DOI: 10.1039/d2nj01962k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ammonium thiocyanate-promoted simple, rapid and eco-friendly neat synthesis of isothiazoles is developed for the first time.
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Affiliation(s)
- Anirban Bera
- Department of Chemistry, Bidhannagar College, Kolkata, 700064, India
- Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Prasanta Patra
- Jhargram Raj College, Jhargram, West Bengal, 721507, India
| | - Abulkalam Azad
- Department of Chemistry, Bidhannagar College, Kolkata, 700064, India
| | - Sk Asraf Ali
- Department of Chemistry, Bidhannagar College, Kolkata, 700064, India
| | | | - Amit Saha
- Department of Chemistry, Jadavpur University, Kolkata, 700032, India
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Bera A, Ali SA, Saha A, Samanta S. Neat synthesis of c-fused pyrroles and its application to macrolactamization. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1939054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Anirban Bera
- Department of Chemistry, Bidhannagar College, Kolkata, India
- Department of Chemistry, Jadavpur University, Kolkata, India
| | - Sk Asraf Ali
- Department of Chemistry, Bidhannagar College, Kolkata, India
| | - Amit Saha
- Department of Chemistry, Jadavpur University, Kolkata, India
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Asraf Ali S, Bera A, Rahaman Molla M, Samanta S. Amidation and Intramolecular Aza‐Michael Reaction: One‐Pot Synthetic Strategy of Isoindolinones. ChemistrySelect 2021. [DOI: 10.1002/slct.202101259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sk Asraf Ali
- Department of Chemistry Bidhannagar College Kolkata 700064 India
- Department of Chemistry University of Calcutta Acharya Prafulla Chandra Road Kolkata 700009 India
| | - Anirban Bera
- Department of Chemistry Bidhannagar College Kolkata 700064 India
| | - Mijanur Rahaman Molla
- Department of Chemistry University of Calcutta Acharya Prafulla Chandra Road Kolkata 700009 India
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First Example of Copper(I) Catalyzed Decarboalkoxymethylation of Alkyl 2-[1-(Pyridin-2-yl)-1 H
-pyrrol-2-yl]acetates. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Bera A, Ali SA, Manna SK, Ikbal M, Misra S, Saha A, Samanta S. A solvent- and catalyst-free tandem reaction: synthesis, and photophysical and biological applications of isoindoloquinazolinones. NEW J CHEM 2020. [DOI: 10.1039/c9nj05808g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
An easy green synthetic approach for fused isoindoloquinazolinones has been developed under neat reaction (yields up to 91%) conditions.
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Affiliation(s)
- Anirban Bera
- Department of Chemistry
- Bidhannagar College
- Kolkata 700064
- India
- Department of Chemistry
| | - Sk Asraf Ali
- Department of Chemistry
- Bidhannagar College
- Kolkata 700064
- India
| | | | - Mohammed Ikbal
- Department of Chemistry Berhampore Girls' College
- Berhampore 742101
- India
| | - Sandip Misra
- Department of Microbiology
- Bidhannagar College
- Kolkata 700064
- India
| | - Amit Saha
- Department of Chemistry
- Kolkata 700032
- India
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Ali SA, Mondal SK, Das T, Manna SK, Bera A, Dafadar D, Naskar S, Molla MR, Samanta S. One-pot tandem cyclisation to pyrrolo[1,2-a][1,4]benzodiazepines: a modified approach to the Pictet-Spengler reaction. Org Biomol Chem 2019; 17:4652-4662. [PMID: 31020983 DOI: 10.1039/c9ob00448c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have reported a one-pot two-step methodology for the synthesis of highly condensed heterocycles, pyrrolo[1,2-a][1,4]benzodiazepines, by a modified Pictet-Spengler reaction under mild conditions in a short time. Our approach has a few advantages over the conventional two components synthesis as it is step and atom economic, environmentally benign and a convergent synthetic method. We have discussed here the broad substrate scope of this novel methodology.
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Affiliation(s)
- Sk Asraf Ali
- Department of Chemistry, Bidhannagar College, Kolkata 700064, India.
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