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Karan G, Sahu S, Metya A, Maji MS. Asymmetric 1,2-Migration at Vicinal Tetrasubstituted Stereocenters Constructed from α-Keto Imines. Angew Chem Int Ed Engl 2024; 63:e202405212. [PMID: 38721919 DOI: 10.1002/anie.202405212] [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: 03/16/2024] [Indexed: 06/21/2024]
Abstract
A carbonyl-assisted asymmetric 1,2-migratory allylation through in situ generation of vicinal tetrasubstituted stereocenters is reported to access enantiopure α-amino ketones and amino alcohols with excellent yields and diastereoselectivities. In a remarkable divergence, despite higher steric hindrance, the allylation exclusively occurs on ketones over imines in the first step, followed by a face-selective 1,2-allyl transfer, thus highlighting an exciting interplay between two distinct electrophiles. The methodology distinguishes itself through its adaptability to gram-scale synthesis, showcasing broad functional-group tolerance and stereodivergence. Density functional theory (DFT) analysis led to a deeper understanding of its selectivity and mechanistic framework. Highlighting its transformative potential, the method was applied to the total synthesis of hapalindole alkaloids.
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Affiliation(s)
- Ganesh Karan
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Samrat Sahu
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Abhisek Metya
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Modhu Sudan Maji
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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Roy A, Duari S, Maity S, Biswas S, Mishra AK, Biswas S. Regioselective Brønsted acid catalyzed ring opening of aziridines by phenols and thiophenols; a gateway to access functionalized indolines, indoles, benzothiazines, dihydrobenzo-thiazines, benzo-oxazines and benzochromenes. Org Biomol Chem 2024; 22:5653-5664. [PMID: 38919997 DOI: 10.1039/d4ob00196f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
Brønsted acid catalyzed regioselective ring opening of aziridines by phenols and thiophenols have been reported. Involvement of a series of aziridines with a range of phenols and thiophenols offer the generality of the reported protocol. Completion of the reaction at room temperature within very short time brings the uniqueness of the developed technique. To emphasis on the application of the developed methodology, the products have been used for the further synthesis of a range of useful and novel heterocyclic molecules such as indolines, indoles, benzothiazines, dihydrobenzothiazines, benzo-oxazines and benzochromenes.
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Affiliation(s)
- Arnab Roy
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata - 700 009, West Bengal, India.
| | - Surajit Duari
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata - 700 009, West Bengal, India.
| | - Srabani Maity
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata - 700 009, West Bengal, India.
| | - Subrata Biswas
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata - 700 009, West Bengal, India.
| | - Abhishek Kumar Mishra
- Department of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow - 226031, U. P., India
| | - Srijit Biswas
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata - 700 009, West Bengal, India.
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Muñoz-Torres MA, Suárez-Pantiga S, Sanz R. Gold-Catalyzed "Back-to-Front" Synthesis of 4-Silyloxyindoles. Org Lett 2024; 26:4969-4974. [PMID: 38838267 PMCID: PMC11187626 DOI: 10.1021/acs.orglett.4c01581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 06/07/2024]
Abstract
A series of pyrrol-yn-glycol derivatives were easily prepared from simple pyrroles through a three-step sequence involving hydroxyalkylation-alkynylation-O-silylation. Their reaction with IPrAuNTf2 triggers a C2-pyrrole attack onto the activated alkyne and subsequent highly selective 1,2-migration of the oxyalkyl group in the intermediate spirocycle. This approach enables the efficient synthesis of a wide selection of regioselectively functionalized 4-hydroxyindoles, which represent important yet challenging indole scaffolds, in high yields.
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Affiliation(s)
- Miguel A Muñoz-Torres
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Samuel Suárez-Pantiga
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Roberto Sanz
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
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Ghosh M, Sahu S, Saha S, Maji MS. Construction of C2-indolyl-quaternary centers by branch-selective allylation: enabling concise total synthesis of the (±)-mersicarpine alkaloid. Chem Sci 2024; 15:1789-1795. [PMID: 38303951 PMCID: PMC10829033 DOI: 10.1039/d3sc04732f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 12/16/2023] [Indexed: 02/03/2024] Open
Abstract
Herein we report a branch-selective allylation strategy for accessing C2-indolyl-all-carbon quaternary centers using allylboronic acids. This approach boasts broad functional group tolerance, scalability, and relies on easily accessible allyl alcohol precursors. Importantly, the C3-position of the indole remains free, offering a handle for further synthetic refinement. Mechanistic pathways, corroborated by density functional theory (DFT), suggest the involvement of an indolenine intermediate and a Zimmerman-Traxler-like transition state during allylboration. Demonstrating its efficacy, the method was applied to the total synthesis of the (±)-mersicarpine alkaloid and enabled formal synthesis of additional alkaloids, such as (±)-scholarisine G, (±)-melodinine E, and (±)-leuconoxine.
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Affiliation(s)
- Minakshi Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302 WB India
| | - Samrat Sahu
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302 WB India
| | - Shuvendu Saha
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302 WB India
| | - Modhu Sudan Maji
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302 WB India
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Munawar S, Zahoor AF, Mansha A, Bokhari TH, Irfan A. Update on novel synthetic approaches towards the construction of carbazole nuclei: a review. RSC Adv 2024; 14:2929-2946. [PMID: 38239436 PMCID: PMC10794906 DOI: 10.1039/d3ra07270c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 01/10/2024] [Indexed: 01/22/2024] Open
Abstract
The carbazole scaffold is a significant entity in organic compounds due to its variety of biological and synthetic applications. Traditionally, carbazole skeletons have been synthesized either via the Grabe-Ullman method, Clemo-Perkin method or Tauber method. With the passage of time, these methods have been modified and explored to accomplish the synthesis of target compounds. These methods include hydroarylations, C-H activations, annulations and cyclization reactions mediated by a variety of catalysts to construct carbazole-based compounds. This brief review article intends to provide recent updates on important methodological developments reported for the synthesis of carbazole nuclei covering 2019-2023.
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Affiliation(s)
- Saba Munawar
- Department of Chemistry, Government College University Faisalabad, 38000-Faisalabad Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad, 38000-Faisalabad Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University Faisalabad, 38000-Faisalabad Pakistan
| | - Tanveer Hussain Bokhari
- Department of Chemistry, Government College University Faisalabad, 38000-Faisalabad Pakistan
| | - Ahmad Irfan
- Department of Chemistry, King Khalid University Abha 61413 P.O. Box 9004 Saudi Arabia
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Sahu S, Banerjee A, Kundu S, Bhattacharyya A, Maji MS. Synthesis of functionalized indoles via cascade benzannulation strategies: a decade's overview. Org Biomol Chem 2022; 20:3029-3042. [PMID: 35332905 DOI: 10.1039/d2ob00187j] [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
Indoles are one of the most prominent aromatic heterocycles in the organic chemistry field. Due to their widespread presence in various natural products, alkaloids, drugs, approved medicines, etc. the synthesis and functionalization of indoles are of great interest. This review emphasizes recent developments and techniques in the domino cascade cyclization process in the last decade starting from the various building blocks. In particular, this review depicts several intriguing benzannulation methods of creating a benzene ring on a pre-existing pyrrole nucleus in an inter/intramolecular fashion under metal-catalyzed/metal-free approaches. Different subsections focus on gradual timely developments in this complementary area and a detailed analysis of the mechanisms and reactivity patterns. As a complementary method, this review gives a significant incentive to various annulation strategies and also gives an overview of the remaining challenges and upcoming possibilities.
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Affiliation(s)
- Samrat Sahu
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Ankush Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Samrat Kundu
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Arya Bhattacharyya
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
| | - Modhu Sudan Maji
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
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Karan G, Sahu S, Maji MS. Synthesis of Indolyl‐1,3‐Dienes from β‐Sulphonyl Aldehydes through One‐Pot Sequential Brønsted Acid/ Base Catalysis. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ganesh Karan
- Indian Institute of Technology Kharagpur Chemistry Indian Institute of Technology KharagpurDepartment of Chemistry 721302 Kharagpur INDIA
| | - Samrat Sahu
- Indian Institute of Technology Kharagpur Chemistry Indian Institute of Technology KharagpurDepartment of Chemistry 721302 Kharagpur INDIA
| | - Modhu Sudan Maji
- Indian Institute of Technology Kharagpur Chemistry Paschim Midnapore 721302 Kharagpur INDIA
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Basuli S, Sahu S, Saha S, Maji MS. Cp*Co(III)‐Catalyzed Dehydrative C2‐Prenylation of Pyrrole and Indole with Allyl Alcohols. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100811] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Suchand Basuli
- Department of Chemistry Indian Institute of Technology Kharagpur West Bengal 721302 India
| | - Samrat Sahu
- Department of Chemistry Indian Institute of Technology Kharagpur West Bengal 721302 India
| | - Shuvendu Saha
- Department of Chemistry Indian Institute of Technology Kharagpur West Bengal 721302 India
| | - Modhu Sudan Maji
- Department of Chemistry Indian Institute of Technology Kharagpur West Bengal 721302 India
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