1
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Kotha S, Solanke BU. Construction of Unusual Amino Acid derivatives and Bis‐Fused Oxacycles via Ring‐Closing Metathesis. ChemistrySelect 2022. [DOI: 10.1002/slct.202203906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
| | - Balaji U. Solanke
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
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2
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Kotha S, Solanke BU, Agarwala PK, Kapoor S. Design and synthesis of hetero-steroids via ring-closing metathesis: Biological studies towards in vitro anticancer activity. Steroids 2022; 188:109119. [PMID: 36202314 DOI: 10.1016/j.steroids.2022.109119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/27/2022] [Accepted: 09/30/2022] [Indexed: 11/15/2022]
Abstract
Here, we report a synthetic approach to hetero-steroids and also studied their biological activities as anticancer agents. A novel class of oxacycles containing estrone moiety were synthesized in this report. Allyl ether derived from estrone underwent Claisen rearrangement (CR) and again O-allylation and subsequent ring-closure gave A-ring-furan and oxepine fused derivatives in high yields. We used double bond isomerization and ring-closing metathesis (RCM) as key steps to assemble hetero steroids containing a mixture of regio isomers like benzofurans and benzoxepine moieties. The novel benzofuran and benzoxepine-based hybrid steroid derivatives were subjected to in vitro cytotoxicity analysis and were found to exert cancer cell-specific activity.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India.
| | - Balaji U Solanke
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Prema Kumari Agarwala
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Shobhna Kapoor
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
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3
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Matelienė (née Dauksaîtė) L, Gu X, Brunner H. The Impact of Macrokinetic Effects on the Heck‐Matsuda Reaction Using in‐situ Generated and Immobilized Pd‐Catalysts. ChemistrySelect 2022. [DOI: 10.1002/slct.202201230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Xiaoting Gu
- Material Science Atotech USA Inc. c/o Case Western Reserve University 2111 Martin Luther King Jr. Drive Cleveland Ohio 44106 United States of America
| | - Heiko Brunner
- Organic Chemistry Atotech Deutschland GmbH & Co. KG Erasmusstrasse 20 10553 Berlin Germany
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4
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Vargas DF, Kaufman TS, Larghi EL. Total Synthesis of Aqabamycin G, a Nitrophenyl Indolylmaleimide Marine Alkaloid from Vibrio sp. WMBA. J Org Chem 2022; 87:13494-13500. [PMID: 35324169 DOI: 10.1021/acs.joc.2c00063] [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 first total synthesis of the marine alkaloid aqabamycin G is disclosed. The synthetic sequence involved the stepwise addition to maleimide of an indole motif and a substituted diazo-benzenoid unit derived from acetaminophen. An alternative strategy using a protected phenol is also reported.
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Affiliation(s)
- Didier F Vargas
- Instituto de Química Rosario (IQUIR, CONICET-UNR) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - Teodoro S Kaufman
- Instituto de Química Rosario (IQUIR, CONICET-UNR) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - Enrique L Larghi
- Instituto de Química Rosario (IQUIR, CONICET-UNR) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK Rosario, Argentina
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5
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Kotha S, Solanke BU. Modular Approach to Benzofurans, 2H-Chromenes and Benzoxepines via Claisen Rearrangement and Ring-Closing Metathesis: Access to Phenylpropanoids. Chem Asian J 2022; 17:e202200084. [PMID: 35218606 DOI: 10.1002/asia.202200084] [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: 01/27/2022] [Revised: 02/25/2022] [Indexed: 11/07/2022]
Abstract
Benzofurans, 2 H -chromenes and benzoxepines are key structural elements present in several natural products and pharmaceuticals. Here, we describe an easy-to-execute strategy for the synthesis of benzofurans, 2 H -chromenes and benzoxepines, by employing Claisen rearrangement and ring-closing metathesis as key steps. A variety of phenols were converted into useful oxacycles in good to excellent yields. The ring-closing metathesis approach has been used to produce phenylpropanoid natural products. Examples described here include, the naturally occurring benzofurans such as 7-methoxywutaifuranal, 7-methoxywutaifuranol, 7-methoxywutaifuranate and the O -prenylated natural products like boropinic acid, boropinols A and C.
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Affiliation(s)
- Sambasivarao Kotha
- Indian Institute of Technology, Department of Chemistry, Powai, 400 076, Mumbai, INDIA
| | - Balaji U Solanke
- Indian Institute of Technology Bombay, Chemistry, 400076, Mumbai, INDIA
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6
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Lood K, Tikk T, Krüger M, Schmidt B. Methylene Capping Facilitates Cross-Metathesis Reactions of Enals: A Short Synthesis of 7-Methoxywutaifuranal from the Xylochemical Isoeugenol. J Org Chem 2022; 87:3079-3088. [PMID: 35037461 DOI: 10.1021/acs.joc.1c02851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Four combinations of type-I olefins isoeugenol and 4-hydroxy-3-methoxystyrene with type-II olefins acrolein and crotonaldehyde were investigated in cross-metathesis (CM) reactions. While both type-I olefins are suitable CM partners for this transformation, we observed synthetically useful conversions only with type-II olefin crotonaldehyde. For economic reasons, isoeugenol, a cheap xylochemical available from renewable lignocellulose or from clove oil, is the preferred type-I CM partner. Nearly quantitative conversions to coniferyl aldehyde by the CM reaction of isoeugenol and crotonaldehyde can be obtained at ambient temperature without a solvent or at high substrate concentrations of 2 mol·L-1 with the second-generation Hoveyda-Grubbs catalyst. Under these conditions, the ratio of reactants can be reduced to 1:1.5 and catalyst loadings as low as 0.25 mol % are possible. The high reactivity of the isoeugenol/crotonaldehyde combination in olefin metathesis reactions was demonstrated by a short synthesis of the natural product 7-methoxywutaifuranal, which was obtained from isoeugenol in a 44% yield over five steps. We suggest that the superior performance of crotonaldehyde in the CM reactions investigated can be rationalized by "methylene capping", i.e., the steric stabilization of the propagating Ru-alkylidene species.
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Affiliation(s)
- Kajsa Lood
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Triin Tikk
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Mandy Krüger
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Bernd Schmidt
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
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7
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Design and synthesis of C3-symmetric molecules containing oxepine and benzofuran moieties via Metathesis. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8
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Krause A, Sperlich E, Schmidt B. Matsuda-Heck arylation of itaconates: a versatile approach to heterocycles from a renewable resource. Org Biomol Chem 2021; 19:4292-4302. [PMID: 33899904 DOI: 10.1039/d1ob00392e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Itaconic acid esters and hemiesters undergo Pd-catalyzed coupling reactions with arene diazonium salts in high to excellent yields. The coupling products of ortho-nitro arene diazonium salts can be converted in one or two steps to benzazepine-2-ones.
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Affiliation(s)
- Andreas Krause
- Universitaet Potsdam, Institut fuer Chemie, Organische Synthesechemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany.
| | - Eric Sperlich
- Universitaet Potsdam, Institut fuer Chemie, Organische Synthesechemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany.
| | - Bernd Schmidt
- Universitaet Potsdam, Institut fuer Chemie, Organische Synthesechemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany.
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9
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Jat JL, Verma S, Kumar P, Khatana AK, Chandra D, Yadav AK, Tiwari B. Zinc(II)-Catalyzed Synthesis of Secondary Amides from Ketones via Beckmann Rearrangement Using Hydroxylamine-O-sulfonic Acid in Aqueous Media. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707809] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A zinc(II)-catalyzed single-step protocol for the Beckmann rearrangement using hydroxylamine-O-sulfonic acid (HOSA) as the nitrogen source in water was developed. This direct method efficiently produces secondary amides under open atmosphere in a pure form after basic aqueous workup. It is environmentally benign and operationally simple.
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Affiliation(s)
- Jawahar L. Jat
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University)
| | - Saumya Verma
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University)
| | - Puneet Kumar
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University)
| | - Anil K. Khatana
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research, SGPGIMS-Campus
| | - Dinesh Chandra
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University)
| | - Ajay K. Yadav
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University)
| | - Bhoopendra Tiwari
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research, SGPGIMS-Campus
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10
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Matelienė née Dauksaîtė L, Knaup J, von Horsten F, Gu X, Brunner H. Benign Arylations of Dimethyl Itaconate via Heck-Matsuda Reaction Utilizing in-Situ Generated Palladium on Aluminum Oxide. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901708] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
| | - Jan Knaup
- R&D Organic Chemistry; Atotech Deutschland GmbH; Erasmusstrasse 20 10553 Berlin Germany
| | - Frank von Horsten
- R&D Organic Chemistry; Atotech Deutschland GmbH; Erasmusstrasse 20 10553 Berlin Germany
| | - Xiaoting Gu
- R&D Material Science; Atotech Inc. USA; c/o Case Western Reserve University; 2111 Martin Luther King Jr. Dr. 44106 Cleveland OH USA
| | - Heiko Brunner
- R&D Organic Chemistry; Atotech Deutschland GmbH; Erasmusstrasse 20 10553 Berlin Germany
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11
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Munnuri S, Verma S, Chandra D, Anugu RR, Falck JR, Jat JL. Cu(OTf) 2-catalyzed Beckmann Rearrangement of Ketones Using Hydroxylamine -O-sulfonic Acid (HOSA). SYNTHESIS-STUTTGART 2019; 51:3709-3714. [PMID: 32684655 PMCID: PMC7367085 DOI: 10.1055/s-0039-1690005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The Beckmann Rearrangement (BKR) of ketones to secondary amides often requires harsh reaction conditions that limit its practicality and scope. Herein, we describe the Cu(OTf)2-catalyzed BKR of ketones under mild reaction conditions using hydroxylamine-O-sulfonic acid (HOSA), a commercial water soluble aminating agent. This method is compatible with most functional groups and directly provides the desired amides in good to excellent yields.
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Affiliation(s)
- Sailu Munnuri
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Saumya Verma
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
| | - Dinesh Chandra
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
| | - Raghunath Reddy Anugu
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - John R. Falck
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Jawahar L. Jat
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
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12
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13
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Riemer N, Shipman M, Wessig P, Schmidt B. Iterative Arylation of Itaconimides with Diazonium Salts through Electrophilic Palladium Catalysis: Divergent β-H-Elimination Pathways in Repetitive Matsuda–Heck Reactions. J Org Chem 2019; 84:5732-5746. [DOI: 10.1021/acs.joc.9b00627] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Nastja Riemer
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24−25, D-14476 Potsdam-Golm, Germany
- Department of Chemistry, University of Warwick, Gibbet Hill Road, CV4 7AL Coventry, U.K
| | - Michael Shipman
- Department of Chemistry, University of Warwick, Gibbet Hill Road, CV4 7AL Coventry, U.K
| | - Pablo Wessig
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24−25, D-14476 Potsdam-Golm, Germany
| | - Bernd Schmidt
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24−25, D-14476 Potsdam-Golm, Germany
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14
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Brunner H, Vedder L. Utilization of Synthetic Calcium‐Phyllosilicates as Bifunctional Bases in the Matsuda‐Heck Reaction. ChemCatChem 2018. [DOI: 10.1002/cctc.201801519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Heiko Brunner
- R&D Organic ChemistryAtotech Deutschland GmbH Erasmusstrasse 20 Berlin D-10553 Germany
| | - Lennart Vedder
- R&D Organic ChemistryAtotech Deutschland GmbH Erasmusstrasse 20 Berlin D-10553 Germany
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15
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Schultze C, Schmidt B. Ring-closing-metathesis-based synthesis of annellated coumarins from 8-allylcoumarins. Beilstein J Org Chem 2018; 14:2991-2998. [PMID: 30591822 PMCID: PMC6296409 DOI: 10.3762/bjoc.14.278] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 11/22/2018] [Indexed: 11/23/2022] Open
Abstract
8-Allylcoumarins are conveniently accessible through a microwave-promoted tandem Claisen rearrangement/Wittig olefination/cyclization sequence. They serve as a versatile platform for the annellation of five- to seven-membered rings using ring-closing olefin metathesis (RCM). Furano-, pyrano-, oxepino- and azepinocoumarins were synthesized from the same set of precursors using Ru-catalyzed double bond isomerizations and RCM in a defined order. One class of products, pyrano[2,3-f]chromene-2,8-diones, were inaccessible through direct RCM of an acrylate, but became available from the analogous allyl ether via an assisted tandem catalytic RCM/allylic oxidation sequence.
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Affiliation(s)
- Christiane Schultze
- Universität Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24–25, D-14476 Potsdam-Golm, Germany
| | - Bernd Schmidt
- Universität Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24–25, D-14476 Potsdam-Golm, Germany
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16
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de Souza AAN, Silva NS, Müller AV, Polo AS, Brocksom TJ, de Oliveira KT. Porphyrins as Photoredox Catalysts in Csp 2-H Arylations: Batch and Continuous Flow Approaches. J Org Chem 2018; 83:15077-15086. [PMID: 30456953 DOI: 10.1021/acs.joc.8b02355] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We have investigated both batch and continuous flow photoarylations of enol-acetates to yield different α-arylated aldehyde and ketone building blocks by using diazonium salts as the aryl-radical source. Different porphyrins were used as SET photocatalysts, and photophysical as well as electrochemical studies were performed to rationalize the photoredox properties and suggest mechanistic insights. Notably, the most electron-deficient porphyrin ( meso-tetra(pentafluorophenyl)porphyrin) shows the best photoactivity as an electron donor in the triplet excited state, which was rationalized by the redox potentials of excited states and the turnover of the porphyrins in the photocatalytic cycle. A two-step continuous protocol and multigram-scale reactions are also presented revealing a robust, cost-competitive, and easy methodology, highlighting the significant potential of porphyrins as SET photocatalysts.
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Affiliation(s)
- Aline A N de Souza
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , São Paulo 13565-905 , Brazil
| | - Nathalia S Silva
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , São Paulo 13565-905 , Brazil
| | - Andressa V Müller
- Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , Santo André , São Paulo 09210-580 , Brazil
| | - André S Polo
- Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , Santo André , São Paulo 09210-580 , Brazil
| | - Timothy J Brocksom
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , São Paulo 13565-905 , Brazil.,Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , Santo André , São Paulo 09210-580 , Brazil
| | - Kleber T de Oliveira
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , São Paulo 13565-905 , Brazil
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17
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Polley A, Varalaxmi K, Jana R. Palladium-Catalyzed Ortho C-H Arylation of Aniline Carbamates with Diazonium Salts under Mild Conditions: Expedient Synthesis of Carbazole Alkaloids. ACS OMEGA 2018; 3:14503-14516. [PMID: 31458136 PMCID: PMC6644385 DOI: 10.1021/acsomega.8b02009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 10/19/2018] [Indexed: 06/10/2023]
Abstract
Despite the significant progress, C-H arylation with aryldiazonium salts is a major challenge because of the faster rate of oxidative addition compared to the C-H insertion, leading to a deleterious homocoupling product. Recently, this limitation has been overcome by merging a photoredox catalyst with transition-metal catalysts which proceeds through a distinct single electron-transfer mechanism. However, we have observed that the photoredox catalyst is not necessary for the C-H arylation of aniline rather chemical reactivity can be controlled by tuning the electronic nature of the substrate. We report, herein, a palladium-catalyzed C-H arylation of aniline carbamates with aryldiazonium salts under external oxidant, acid, base free conditions at room temperature. Mechanistic studies suggest that the present reaction proceeds through a directed electrophilic metalation pathway which is the slowest step. However, the oxidative addition may take place through either ionic (2e-) or radical (1e-) pathway to generate hypervalent Pd(IV) or Pd(III) intermediate, respectively. A facile reductive elimination from the hypervalent palladium complex furnishes the C-H arylation product under mild conditions. The carbamate directing group is easily removed from the product to obtain the corresponding ortho-arylated aniline, which is a precursor for plethora of carbazole alkaloids and other biologically active molecules. The reaction is scaled-up to gram scale to furnish the desired product in comparable yields. Finally, we have applied this C-H arylation methodology for the synthesis of series of carbazole alkaloids such as clausine V, clauszoline K, O-methoxymahanine, and O-methylmurrayamine-D.
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Affiliation(s)
- Arghya Polley
- Organic
and Medicinal Chemistry Division, CSIR-Indian
Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West
Bengal, India
- Academy
of Scientific and Innovative Research (AcSIR), Kolkata 700032, West Bengal, India
| | - Kasarla Varalaxmi
- Organic
and Medicinal Chemistry Division, CSIR-Indian
Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West
Bengal, India
- National
Institute of Pharmaceutical Education and Research, Kolkata 700054, West Bengal, India
| | - Ranjan Jana
- Organic
and Medicinal Chemistry Division, CSIR-Indian
Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West
Bengal, India
- Academy
of Scientific and Innovative Research (AcSIR), Kolkata 700032, West Bengal, India
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18
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Formal group insertion into aryl C‒N bonds through an aromaticity destruction-reconstruction process. Nat Commun 2018; 9:3423. [PMID: 30143605 PMCID: PMC6109128 DOI: 10.1038/s41467-018-05637-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 07/16/2018] [Indexed: 12/01/2022] Open
Abstract
Given the abundance and the ready availability of anilines, the selective insertion of atoms into the aryl carbon–nitrogen bonds will be an appealing route for the synthesis of nitrogen-containing aromatic molecules. However, because aryl carbon–nitrogen bonds are particularly inert, anilines are normally activated by conversion to more reactive intermediates such as aryldiazonium salts to achieve functionalization of the aryl carbon–nitrogen bonds, but the nitrogen atom is usually not incorporated into products, instead being discarded. The selective insertion of groups into aryl carbon–nitrogen bonds remains an elusive challenge and an unmet need in reaction design. Here we show an aromaticity destruction-reconstruction process that selectively inserts a trimethylenemethane (TMM) group into the aromatic carbon–nitrogen bond of anilines concomitant with a benzylic carbon–hydrogen bond functionalization. This process provides a transformative mode for anilines, and the insertion products are versatile precursor to various nitrogen-containing aromatic molecules through simple conversions. Activation of C–N bonds of anilines requires transformation of the amino group into a more reactive functionality. Here, the authors report an aromaticity destruction-reconstruction process that converts abundant anilines into valuable amines through group insertion into the C–N bond and benzylic C–H functionalization.
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19
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Chang FR, Li PS, Huang Liu R, Hu HC, Hwang TL, Lee JC, Chen SL, Wu YC, Cheng YB. Bioactive Phenolic Components from the Twigs of Atalantia buxifolia. JOURNAL OF NATURAL PRODUCTS 2018; 81:1534-1539. [PMID: 29975532 DOI: 10.1021/acs.jnatprod.7b00938] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Five new compounds named buxifoximes A-C (1-3), buxifobenzoate (4), and 7- O-(7'-peroxygeranyl) coumarin (5), together with 25 known compounds, were identified from the twigs of Atalantia buxifolia. Compounds 1-3 are unique secondary metabolites with the aldoxime functionality. The structures of the isolates were determined on the basis of spectroscopic data analyses, and the structure of 1 was confirmed by an X-ray single-crystallographic analysis. With respect to bioactivity, antidengue virus, anti-inflammatory, and cytotoxic activities of all purified compounds were tested and evaluated. Compound 1 showed a significant anti-inflammatory effect by inhibiting superoxide anion generation with an IC50 value of 4.8 ± 0.7 μM. Among the acridone alkaloids, 5-hydroxy- N-methylseverifoline (23) exhibited antidengue activity (IC50 = 5.3 ± 0.4 μM), and atalaphyllinine (20) demonstrated cytotoxicity (IC50 = 6.5 ± 0.0 μM) against the human liver cancer cell line, HepG2.
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Affiliation(s)
- Fang-Rong Chang
- National Research Institute of Chinese Medicine , Taipei 112 , Taiwan
| | | | - Rosa Huang Liu
- School of Nutrition, College of Health Care and Management , Chung Shan Medical University , Taichung 402 , Taiwan
| | | | - Tsong-Long Hwang
- Graduate Institute of Natural Products, College of Medicine , Chang Gung University , Taoyuan 333 , Taiwan
| | | | | | - Yang-Chang Wu
- Department of Medical Research , Kaohsiung Medical University Hospital , Kaohsiung 807 , Taiwan
| | - Yuan-Bin Cheng
- Department of Medical Research , Kaohsiung Medical University Hospital , Kaohsiung 807 , Taiwan
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Lucks S, Brunner H. In Situ Generated Palladium on Aluminum Phosphate as Catalytic System for the Preparation of β,β-Diarylated Olefins by Matsuda–Heck Reaction. Org Process Res Dev 2017. [DOI: 10.1021/acs.oprd.7b00279] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sandra Lucks
- Atotech Deutschland GmbH, Erasmusstrasse 20, D-10553 Berlin, Germany
| | - Heiko Brunner
- Atotech Deutschland GmbH, Erasmusstrasse 20, D-10553 Berlin, Germany
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