1
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Hussain A, Sravanthi R, Katta S, Ramachary DB. Two-step, high-yielding total synthesis of antibiotic pyrones. Org Biomol Chem 2024; 22:554-560. [PMID: 38116605 DOI: 10.1039/d3ob01923c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
A simple two-step dialkylation protocol was developed to synthesize biologically active antibiotics photopyrones, pseudopyronines, and violapyrones from bio-renewable triacetate lactone in excellent yields. These pyrones are functionally modified into another set of pyrone natural products by a single O-methylation reaction. The high-yielding gram scale synthesis of four natural products [pseudopyronine A, photopyrone A, pseudopyronine B and photopyrone C] demonstrated the viability for industrial applications.
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Affiliation(s)
- Akram Hussain
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
| | - Revoju Sravanthi
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
- Pharmacognosy and Phytochemistry Division, Gitam Institute of Pharmacy, Gitam Deemed to be University, Visakhapatnam, 530 045, Andhra Pradesh, India
| | - Sunitha Katta
- Pharmacognosy and Phytochemistry Division, Gitam Institute of Pharmacy, Gitam Deemed to be University, Visakhapatnam, 530 045, Andhra Pradesh, India
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2
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Hussain A, Peraka S, Ramachary DB. Organocatalytic Reductive Amination of the Chiral Formylcyclopropanes: Scope and Applications. J Org Chem 2023; 88:16047-16064. [PMID: 37948127 DOI: 10.1021/acs.joc.3c01074] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
We developed a sustainable three-component reductive amination protocol for the chemoselective coupling of optically active functionally rich donor-acceptor carbonyl-cyclopropanes with various amines under 10 mol % of diphenyl phosphate in the presence of Hantzsch ester as a hydride source. The catalytic selective reductive C-N coupling has wide advantages like no epimerization, no ring opening, large substrate scope, generating only mono N-alkylation products and simultaneously resulting in chiral cyclopropane-containing amines possessing many applications in the medicinal chemistry. In this article, we have shown the synthetic applications of reductive C-N coupling reaction to make chiral α-carbonyl-cyclopropane containing amines 8, double C-N coupled cyclopropane-amines 10, unusual C-N/C-C coupled cyclopropane-amines 12, chiral tert-butylsulfinamide containing cyclopropanes 14/15, and functionally rich chiral cyclopropane-fused N-heterocycles 16/18/19. Many of these chiral cyclopropane-amines 5-19 can serve as building blocks for the synthesis of drug-like small molecules, natural products, pharmaceuticals, and their analogues.
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Affiliation(s)
- Akram Hussain
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Swamy Peraka
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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3
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Roy P, Anjum SR, Sanwal SD, Ramachary DB. Direct organocatalytic transfer hydrogenation and C-H oxidation: high-yielding synthesis of 3-hydroxy-3-alkyloxindoles. Org Biomol Chem 2023; 21:8335-8343. [PMID: 37800473 DOI: 10.1039/d3ob01264f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Readily available 3-alkylideneoxindoles were effectively reduced to 3-alkyloxindoles through transfer hydrogenation using Hantzsch ester as a reducing agent at ambient temperature and the greenness/sustainability of this protocol was assessed by correlation with Pd/C-mediated hydrogenation with hydrogen gas. Furthermore, an organocatalytic method was developed to access drug-like 3-alkyl-3-hydroxyoxindoles by C-H oxidation of 3-alkyl-indolin-2-one, using a catalytic amount of 1,1,3,3-tetramethylguanidine (TMG) as an organic base and dissolved oxygen in THF as an oxidant at room temperature. Key reaction intermediates were observed by controlled on-line ESI-HRMS experiments and identified by their corresponding mass (m/z) analysis. This two-step high-yielding transfer hydrogenation/C-H oxidation protocol was used for the total synthesis of medicinally important 3-cyanomethyl-3-hydroxyoxindole and formal total synthesis of (±)-alline and (±)-CPC-I in very good overall yields compared to previous methods.
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Affiliation(s)
- Pritam Roy
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
| | - S Rehana Anjum
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
| | - Shyam D Sanwal
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad-500 046, India.
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4
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Doraghi F, Mohaghegh F, Qareaghaj OH, Larijani B, Mahdavi M. Synthesis of N-, O-, and S-heterocycles from aryl/alkyl alkynyl aldehydes. RSC Adv 2023; 13:13947-13970. [PMID: 37181524 PMCID: PMC10167737 DOI: 10.1039/d3ra01778h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 04/26/2023] [Indexed: 05/16/2023] Open
Abstract
In the field of heterocyclic synthesis, alkynyl aldehydes serve as privileged reagents for cyclization reactions with other organic compounds to construct a broad spectrum of N-, O-, and S-heterocycles. Due to the immense application of heterocyclic molecules in pharmaceuticals, natural products, and material chemistry, the synthesis of such scaffolds has received wide attention. The transformations occurred under metal-catalyzed, metal-free-promoted, and visible-light-mediated systems. The present review article highlights the progress made in this field over the past two decades.
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Affiliation(s)
- Fatemeh Doraghi
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences Tehran Iran
| | - Farid Mohaghegh
- School of Chemistry, College of Science, University of Tehran Tehran Iran
| | | | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences Tehran Iran
| | - Mohammad Mahdavi
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences Tehran Iran
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5
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Abonia R, Insuasty D, Laali KK. Recent Advances in the Synthesis of Propargyl Derivatives, and Their Application as Synthetic Intermediates and Building Blocks. Molecules 2023; 28:molecules28083379. [PMID: 37110613 PMCID: PMC10146578 DOI: 10.3390/molecules28083379] [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: 03/11/2023] [Revised: 04/05/2023] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
The propargyl group is a highly versatile moiety whose introduction into small-molecule building blocks opens up new synthetic pathways for further elaboration. The last decade has witnessed remarkable progress in both the synthesis of propargylation agents and their application in the synthesis and functionalization of more elaborate/complex building blocks and intermediates. The goal of this review is to highlight these exciting advances and to underscore their impact.
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Affiliation(s)
- Rodrigo Abonia
- Research Group of Heterocyclic Compounds, Department of Chemistry, Universidad del Valle, Cali A.A. 25360, Colombia
| | - Daniel Insuasty
- Grupo de Investigación en Química y Biología, Departamento de Química y Biología, Universidad del Norte, Barranquilla 081007, Atlántico, Colombia
| | - Kenneth K Laali
- Department of Chemistry, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA
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6
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Roy P, Krishna AV, Ramachary DB. Direct Organocatalytic Reductive Alkylation of Syncarpic Acid: Scope and Applications. J Org Chem 2022; 87:16026-16038. [PMID: 36367306 DOI: 10.1021/acs.joc.2c02164] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Biologically important 4-alkylsyncarpic acids, which resemble the core structure of many natural products, were synthesized in one-pot through the organocatalytic three-component reductive alkylation with excellent yields and C-selectivity. Synthetic applications of 4-alkylsyncarpic acids were demonstrated by converting into the functionally rich molecules through different reactions like Michael, retro-Michael, reduction, and oxidation reactions. In a continuation, formal total synthesis of (±)-triumphalone, (±)-isotriumphalone, and monomeric phloroglucinol derivatives was reported in a few steps starting from 4-alkylsyncarpic acids in overall very good yields. Further showcasing the importance of C-alkylated products, 4-benzylsyncarpic acid and its Michael adduct with methyl vinyl ketone were synthesized in a gram scale without compromising rate/yields.
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Affiliation(s)
- Pritam Roy
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Anugam V Krishna
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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7
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Kamanna K. Organocatalysts based on natural and modified amino acids for asymmetric reactions. PHYSICAL SCIENCES REVIEWS 2022. [DOI: 10.1515/psr-2021-0026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Small organic molecules predominantly containing C, H, O, N, S and P element are found promising molecule to accelerate chemical reactions and are named organocatalysis. In addition, these organocatalysts are easy availability, stable in water and air, inexpensive, and low toxicity, which confer a huge direct application in organic synthesis when compared to transition metal catalyzed reactions and becoming powerful tools in the construction of a selective chiral product. Interest on organocatalysis is spectacularly increased since last two decades, due to the novelty of the concept and selectivity. Based on the nature of the organocatalysts used, they are classified in to four major classes, among them one of the types is amino acids derived organocatalysts. Natural amino acids are playing important role in building blocks of protein construction, and also intermediate products of the metabolism. α-Amino acid is a molecule, that contains both amine and carboxyl functional group. Their particular structural characteristic determines their role in protein synthesis, and bifunctional asymmetric catalysts for stereoselective synthesis. Two functional groups present on a single carbon acting as an acid and base, which promote chemical transformations in concert similar to the enzymatic catalysis. The post translational derivatives of natural α-amino acids include 4-hydroxy-L-proline and 4-amino-L-proline scaffolds, and its synthetic variants based organocatalysts, whose catalytic activity is well documented. This chapter discussed past and present development of the organocatalysts derived from natural and modified amino acids for various important organic transformations reviewed.
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Affiliation(s)
- Kantharaju Kamanna
- Department of Chemistry , Rani Channamma University , Vidyasangama , P-B, NH-4 , Belagavi 591156 , Karnataka , India
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8
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Nishikawa K, Kikuta K, Tsuruta T, Nakatsukasa H, Sugahara S, Kume S, Morimoto Y. Asymmetric Total Synthesis of Toxicodenane A by Samarium-Iodide-Induced Barbier-Type Cyclization and Its Cell-Protective Effect against Lipotoxicity. Org Lett 2022; 24:531-535. [PMID: 34978434 DOI: 10.1021/acs.orglett.1c03924] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The asymmetric total synthesis of toxicodenane A, a sesquiterpenoid expected to be promising for diabetic nephropathy, was achieved. In the synthesis, a samarium iodide (SmI2)-induced Barbier-type cyclization and a regio- and stereoselective allylic oxidation followed by a dehydration cyclization were employed as key steps. Furthermore, the first asymmetric syntheses of both enantiomers were accomplished using the previously mentioned synthetic strategy. Finally, the synthetic compounds significantly inhibited lipotoxicity-mediated inflammatory and fibrotic responses in mouse renal proximal tubular cells.
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Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Koki Kikuta
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomoki Tsuruta
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Hitoshi Nakatsukasa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Sho Sugahara
- Department of Medicine, Shiga University of Medical Science, Tsukinowacho, Seta, Otsu, Shiga 520-2192, Japan
| | - Shinji Kume
- Department of Medicine, Shiga University of Medical Science, Tsukinowacho, Seta, Otsu, Shiga 520-2192, Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
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Sharma D, Kumar M, Das P. Application of cyclohexane-1,3-diones for six-membered oxygen-containing heterocycles synthesis. Bioorg Chem 2020; 107:104559. [PMID: 33418315 DOI: 10.1016/j.bioorg.2020.104559] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/23/2020] [Accepted: 12/10/2020] [Indexed: 12/17/2022]
Abstract
Cyclohexan-1,3-dione derivatives are versatile scaffolds for the synthesis of a variety of value-added organic molecules including heterocycles and natural products. Six-membered oxygen heterocycles prepared from cyclohexan-1,3-diones are of much importance as they are intermediate for the synthesis of a number of natural products and several other valuable bioactive molecules which shows anti-viral, anti-bacterial, analgesic, antimalarial, anti-inflammatory, anti-allergic, anti-tumor and anti-cancer activities. These advantages have inspired us to write a detailed survey on the newly developed methods which are very essential in the construction of six-membered oxygen heterocycles. Further, the versatility in the chemistry of cyclohexan-1,3-dione and its derivatives is due to the presence of highly active methylene moiety and its active di-carbonyl groups. Recently, reactions of cyclohexane-1,3-dione and its derivatives with other substrates for instance aldehydes, malononitriles, NMSM, chalcones, isatin etc. have been established for the construction of a variety of six-membered oxygen heterocycles. The studies reported in this review article involved the synthesis of six-membered oxygen-containing heterocycles which includes 4H-chromen-5(6H)-one, 2H-xanthen-1(9H)-one, 2H-xanthen-1,8(5H,9H)-dione, 6H-chromen-2,5-dione derivatives and natural products having six-membered oxygen heterocycles from cyclohexane-1,3-dione and its derivatives as one of the substrate.
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Affiliation(s)
- Dharminder Sharma
- PG Department of Chemistry, JCDAV College Dasuya, Punjab 144205, India; Chemical Technology Department, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, HP, India.
| | - Manish Kumar
- Department of Chemistry, Govt. College Seraj at Lambathach, Distt. Mandi, 175048 HP, India; Chemical Technology Department, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, HP, India
| | - Pralay Das
- Chemical Technology Department, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, HP, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.
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10
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Chen S, Bai R, Li M, Liu P, Gu Y. Acid‐Acid‐Catalyzed Tandem Reactions Driven by an Additive‐Like Component. CHEM REC 2020. [DOI: 10.1002/tcr.202000097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shaomin Chen
- Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P.R. China
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical Engineering Shihezi University Shihezi 832004 P.R. China
| | - Rongxian Bai
- Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P.R. China
| | - Minghao Li
- Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P.R. China
| | - Ping Liu
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical Engineering Shihezi University Shihezi 832004 P.R. China
| | - Yanlong Gu
- Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P.R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Lanzhou 730000 P.R. China
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11
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Deng Z, Zhou D. Mechanisms of Csp
2
–H functionalization of aldehydes with triplet O
2
catalyzed by NHPI: A density functional theory investigation. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Zhe‐Peng Deng
- Research Institute Lanzhou Jiaotong University Lanzhou China
| | - Da‐Gang Zhou
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, Institute of Synthesis and Application of Functional Materials, College of Chemistry and Chemical Engineering China West Normal University Nanchong China
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12
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Roy P, Anjum SR, Ramachary DB. One-Pot Knoevenagel and [4 + 2] Cycloaddition as a Platform for Calliviminones. Org Lett 2020; 22:2897-2901. [DOI: 10.1021/acs.orglett.0c00518] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pritam Roy
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - S. Rehana Anjum
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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