1
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Scarpi D, Capanni C, Visi S, Faggi C, Occhiato EG. Gold(I)-Catalyzed Rautenstrauch/Hetero-Diels-Alder/Retro-aza-Michael Cascade Reaction for the Synthesis of α-Hydrazineyl-2-cyclopentenones. J Org Chem 2024; 89:14108-14119. [PMID: 39267288 DOI: 10.1021/acs.joc.4c01518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/17/2024]
Abstract
A one-pot synthesis of ring-fused, α-hydrazineyl-2-cyclopentenone derivatives is achieved by a gold(I)-catalyzed Rautenstrauch/hetero Diels-Alder/ring opening tandem reaction of suitable propargyl esters. By mixing the latter with a dialkylazodicarboxylate in the presence of a gold(I) catalyst, the 1,2-acyloxy migration/cyclization process (Rautenstrauch reaction) leads to cyclopentadienyl ester intermediates which are trapped by the heterodienophile present in situ. This provides strained intermediates which spontaneously undergo highly regioselective ring opening by a retro aza-Michael reaction promoted by the gold(I) catalyst, eventually yielding the target compounds. Six- and seven-membered ring-fused cyclopentenones bearing a pendant α-hydrazineyl moiety can be obtained in moderate to excellent yield (50-98%) by this approach, with a minimal erosion of the initial optical purity when using enantioenriched substrates.
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Affiliation(s)
- Dina Scarpi
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Italy
| | - Claudia Capanni
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Italy
| | - Samuele Visi
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Italy
| | - Cristina Faggi
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Italy
| | - Ernesto G Occhiato
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Italy
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2
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Saini RK, Borpatra PJ, Chaubey TN, Pandey SK. I 2-Mediated Site-Selective C-H Functionalization: Access to p-Amino-Substituted Unsymmetrical Benzils and Quinoxalines from Sulfoxonium Ylides. J Org Chem 2024; 89:5536-5545. [PMID: 38569000 DOI: 10.1021/acs.joc.3c02975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
An I2-mediated approach for selective C-H functionalization of unprotected aniline derivatives for synthesizing benzils and quinoxaline derivatives from sulfoxonium ylides has been described. Aniline derivatives and sulfoxonium ylides ornamented with different functional groups showed good compatibility. They afforded the corresponding products with moderate to high yields via a mild and simple procedure. Finally, we validated the practicality of this method by scaling up the reaction and further conversion of the synthesized derivatives into other valuable molecules.
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Affiliation(s)
- Rahul Kumar Saini
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Paran J Borpatra
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Trayambek Nath Chaubey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Satyendra Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
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3
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Wen K, Feng M, Gao Q, Chen C, Wu Y, Zhou J, Huang L, Tang X. α‐Benzylation of Carbonyl Compounds Enabled by Synergistic Copper/Amine Catalyzed Decarboxylation of Arylacetic Acids. Adv Synth Catal 2023. [DOI: 10.1002/adsc.202300084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Affiliation(s)
- Kangmei Wen
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
| | - Mengxia Feng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China
| | - Qiwen Gao
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
| | - Chen Chen
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
| | - Yinrong Wu
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
| | - Jiamin Zhou
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
| | - Liangbin Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China
| | - Xiaodong Tang
- Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 P. R. China
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4
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Dutta L, Chattopadhyay A, Yadav N, Ramasastry SSV. Phosphine-catalysed denitrative rearomatising (3 + 2) annulation of α,β-ynones and 3-nitroindoles. Org Biomol Chem 2023; 21:738-742. [PMID: 36601997 DOI: 10.1039/d2ob02180c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We describe a metal-free strategy to access various α-arylidene cyclopenta[b]indoles via phosphine-catalysed (3 + 2) annulation of α,β-ynones and 3-nitroindoles. For the first time, the rearomatisation of the indole nucleus was observed in such an annulative transformation. The method was extended to the synthesis of an antimalarial natural product, bruceolline E.
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Affiliation(s)
- Lona Dutta
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
| | - Anwita Chattopadhyay
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
| | - Nisha Yadav
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
| | - S S V Ramasastry
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
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5
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Scarpi D, Bagni F, Faggi C, Carral-Menoyo A, Gómez-Bengoa E, Occhiato EG. Gold(I)-Catalyzed Cycloisomerization/Hetero-Diels-Alder Reaction/Ring Opening Cascade to Functionalized Cyclopentadienes. J Org Chem 2022; 87:6038-6051. [PMID: 35442687 DOI: 10.1021/acs.joc.2c00296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Six- and seven-membered ring-fused, functionalized cyclopentadienes can be obtained in moderate to excellent yields by a cascade process entailing the Au(I)-catalyzed propargyl Claisen rearrangement/Nazarov cyclization of propargyl vinyl ethers, the hetero-Diels-Alder reaction with dialkylazodicarboxylates, and the spontaneous conversion of cycloaddition products into cyclopentadienes by a highly regioselective cleavage of a C-N bond. Depending on the treatment of the crude reaction mixtures, two types of products can be obtained: cyclopentadienes with pendant hydrazine and aldehyde moieties that intramolecularly react to form hemiaminals are obtained in 43-52% overall yields when the crude reaction mixtures are left over K2CO3 in a DCM solution. Instead, by reducing in situ the aldehyde group just after addition of the heterodienophile, the regioselective C-N bond cleavage generates the corresponding cyclopentadienes bearing a hydrazine and an alcohol appendage in excellent yields (66-82%) over four steps, all in one pot. Two examples from the latter class of compounds were also converted into ring-fused, functionalized cyclopentadienes, bearing a protected amino group, by the selective N-N cleavage of the hydrazine moiety.
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Affiliation(s)
- Dina Scarpi
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, Sesto Fiorentino (FI) 50019, Italy
| | - Francesco Bagni
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, Sesto Fiorentino (FI) 50019, Italy
| | - Cristina Faggi
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, Sesto Fiorentino (FI) 50019, Italy
| | - Asier Carral-Menoyo
- Department of Organic Chemistry I, University of the Basque Country, UPV-EHU, Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain
| | - Enrique Gómez-Bengoa
- Department of Organic Chemistry I, University of the Basque Country, UPV-EHU, Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain
| | - Ernesto G Occhiato
- Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, Via della Lastruccia 13, Sesto Fiorentino (FI) 50019, Italy
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Zhang J, Shi SQ, Hao WJ, Dong GY, Tu SJ, Jiang B. Tunable Electrocatalytic Annulations of o-Arylalkynylanilines: Green and Switchable Syntheses of Skeletally Diverse Indoles. J Org Chem 2021; 86:15886-15896. [PMID: 33534572 DOI: 10.1021/acs.joc.0c02898] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tunable electrocatalytic annulation reactions of o-arylalkynylanilines have been established, leading to green and divergent syntheses of skeletally diverse indoles by adjusting the electrolytes and the solvents. The presence of ammonium halides as the electrolytes enabled the halogenation of o-arylalkynylanilines to give C3-halogenated indoles whereas naphtho[1',2':4,5]furo[3,2-b]indoles could be obtained by changing the electrolyte from ammonium halides to KI. Interestingly, by combining acetone as the solvent and both NH4I and NH4Cl as the electrolytes, the reaction worked through an intramolecular annulation and [5 + 1] cyclization cascade to form naphtho[1',2':5,6][1,3]oxazino[3,4-a]indoles.
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Affiliation(s)
- Jie Zhang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
| | - Shao-Qing Shi
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
| | - Guo-Yun Dong
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P.R. China
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7
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Morita N, Tamura O. Strategic Use of Difference of Valence of Gold Catalysts: Development of Cyclization Reactions Oriented toward Synthetic Diversity Using Propargylic Alcohols. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Zhuang S, Tang Y, He C, Chen X, Xue W, Wu Y, Wu A. Copper‐catalyzed Reaction of Anthranils with Methyl Ketones: Site‐Selective C5‐Dicarbonylation of Anthranils. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001334] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Shi‐Yi Zhuang
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
| | - Yong‐Xing Tang
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
| | - Cai He
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
| | - Xiang‐Long Chen
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
| | - Wei‐Jian Xue
- College of Chemistry and Chemical Engineering Qiqihar University Qiqihar 161006 People's Republic of China
| | - Yan‐Dong Wu
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
| | - An‐Xin Wu
- Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 People's Republic of China
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9
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Rinaldi A, Langé V, Scarpi D, Occhiato EG. Synthesis of (±)‐
epi
‐Jungianol by the Gold(I)‐Catalyzed Propargyl Claisen Rearrangement/Hydroarylation Cascade Reaction of Propargyl Vinyl Ethers. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Antonia Rinaldi
- Dipartimento di Chimica “U. Schiff” Università degli Studi di Firenze Via della Lastruccia 13 50019 Sesto Fiorentino (FI) Italy
| | - Vittoria Langé
- Dipartimento di Chimica “U. Schiff” Università degli Studi di Firenze Via della Lastruccia 13 50019 Sesto Fiorentino (FI) Italy
| | - Dina Scarpi
- Dipartimento di Chimica “U. Schiff” Università degli Studi di Firenze Via della Lastruccia 13 50019 Sesto Fiorentino (FI) Italy
| | - Ernesto G. Occhiato
- Dipartimento di Chimica “U. Schiff” Università degli Studi di Firenze Via della Lastruccia 13 50019 Sesto Fiorentino (FI) Italy
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10
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Zanella G, Petrović M, Scarpi D, Occhiato EG, Gómez-Bengoa E. Pentannulation of N-heterocycles by a tandem gold-catalyzed [3,3]-rearrangement/Nazarov reaction of propargyl ester derivatives: a computational study on the crucial role of the nitrogen atom. Beilstein J Org Chem 2020; 16:3059-3068. [PMID: 33414853 PMCID: PMC7753109 DOI: 10.3762/bjoc.16.255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/30/2020] [Indexed: 12/24/2022] Open
Abstract
The tandem gold(I)-catalyzed rearrangement/Nazarov reaction of enynyl acetates in which the double bond is embedded in a piperidine ring was computationally and experimentally studied. The theoretical calculations predict that the position of the propargylic acetate substituent has a great impact on the reactivity. In contrast to our previous successful cyclization of the 2-substituted substrates, where the nitrogen favors the formation of the cyclized final product, the substitution at position 3 was computed to have a deleterious effect on the electronic properties of the molecules, increasing the activation barriers of the Nazarov reaction. The sluggish reactivity of 3-substituted piperidines predicted by the calculations was further confirmed by the results obtained with some designed substrates.
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Affiliation(s)
- Giovanna Zanella
- Departamento de Química Orgánica I, University of the Basque Country, UPV-EHU, Manuel Lardizabal 3, 20018 Donostia, San Sebastián, Basque Country, Spain
| | - Martina Petrović
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Florence, Italy
| | - Dina Scarpi
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Florence, Italy
| | - Ernesto G Occhiato
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Florence, Italy
| | - Enrique Gómez-Bengoa
- Departamento de Química Orgánica I, University of the Basque Country, UPV-EHU, Manuel Lardizabal 3, 20018 Donostia, San Sebastián, Basque Country, Spain
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11
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Talukdar R. Rapid access to 3-acyl indoles using ethyl acetate/triflic acid couple as the acylium donor and Cu(OAc) 2 catalysed aerial oxidation of indole benzoins. Org Biomol Chem 2020; 18:8876-8880. [PMID: 33103169 DOI: 10.1039/d0ob01977a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Esters are potential acyl donors but are relatively unexplored for that purpose. A facile installation of acyl groups at the C-3 position of indoles under triflic acid catalysed conditions with easily available and cheap esters as new acylating agents is described herein. Furthermore, heterocycles like N-protected pyrrole, furan and thiophene were also suitable substrates for similar C-2 acylation. Analogous C-3 benzoylated products of indole were obtained, albeit in lower yields, by using methyl benzoate as a benzoyl donor. The benzoylated products were synthesised in much better yields via a copper(ii) catalysed aerial oxidation of indole containing benzoins.
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Affiliation(s)
- Ranadeep Talukdar
- Molecular Synthesis and Drug Discovery Laboratory, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow-226014, India.
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12
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Catalytic asymmetric dipolar cycloadditions of indolyl delocalized metal-allyl species for the enantioselective synthesis of cyclopenta [b]indoles and pyrrolo[1,2-a]indoles. Sci China Chem 2020. [DOI: 10.1007/s11426-020-9854-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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13
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Gaikwad D. Unprecedented total synthesis of bruceolline D, E, and H. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1795199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Dnyaneshwar Gaikwad
- Department of Chemistry, B.P.H.E. Society’s Ahmednagar College, Ahmednagar, India
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14
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Novel effective antibacterial small-molecules against Staphylococcus and Enterococcus strains. Future Med Chem 2020; 12:1205-1211. [PMID: 32515228 DOI: 10.4155/fmc-2020-0010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: Resistance developments against established antibiotics are an emerging problem for antibacterial therapies. Novel antibiotics are urgently needed. Materials & methods: We developed novel small-molecule antibacterials which are easily accessible in a simple one-pot synthesis. The central cyclopentaindole core is substituted with two indole residues. Various indole and cyclopentane substituents have been introduced. Additionally, first indole substituted propene compounds as ring-open variants of the cyclopentaindoles have been yielded and evaluated as antibacterials against Staphylococcus aureus and Enterococcus strains. Results: Most effective compounds have been those with a bromo cyclopentane and a chloro indole substitution. First lead compounds were identified with promising activities similar to that observed in vitro for last resort antibiotics, so that the novel compounds enriche the pool of perspective small-molecule antibacterial drug candidates.
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15
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Wang F, Zhang X, He Y, Fan X. Synthesis of β-Dicarbonylated Tetrahydropiperidines via Direct Oxidative Cross-Coupling between Different C(sp3)–H Bonds. J Org Chem 2019; 85:2220-2230. [DOI: 10.1021/acs.joc.9b02924] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Fang Wang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinying Zhang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yan He
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuesen Fan
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
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16
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Prandi C, Occhiato EG. From synthetic control to natural products: a focus on N-heterocycles. PEST MANAGEMENT SCIENCE 2019; 75:2385-2402. [PMID: 30624033 DOI: 10.1002/ps.5322] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/04/2019] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
Natural products containing a N-heterocycle motif are widespread in nature and medicinal plants, in particular, have proved to be a source of almost unlimited N-derived structures with high molecular diversity. Because of their intrinsic potential for use in both biomedical and agricultural applications, there is a general need for new compounds and for the synthesis of 'natural-inspired' analogues. Importantly, transition of a natural product from discovery to a 'market lead' is associated with an increasingly challenging demand for more of the compound, which cannot be met by isolation from natural plant sources, often due to low extraction yields and uneven availability of the plant source itself. Synthesis remains the most reliable approach to provide valuable products for the market. In this review, a comprehensive overview of our contribution to synthetic access to N-derived natural products is given. Major strengths of the proposed methodologies are discussed critically. © 2019 Society of Chemical Industry.
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Affiliation(s)
| | - Ernesto G Occhiato
- Department of Chemistry 'U. Schiff', Università degli Studi di Firenze, Sesto Fiorentino, Italy
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17
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Rinaldi A, Langé V, Gómez-Bengoa E, Zanella G, Scarpi D, Occhiato EG. Synthesis of Indenes by Tandem Gold(I)-Catalyzed Claisen Rearrangement/Hydroarylation Reaction of Propargyl Vinyl Ethers. J Org Chem 2019; 84:6298-6311. [DOI: 10.1021/acs.joc.9b00646] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Antonia Rinaldi
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino (FI), Italy
| | - Vittoria Langé
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino (FI), Italy
| | - Enrique Gómez-Bengoa
- Departamento de Química Orgánica I, Universidad del País Vasco/UPV-EHU, Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Giovanna Zanella
- Departamento de Química Orgánica I, Universidad del País Vasco/UPV-EHU, Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Dina Scarpi
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino (FI), Italy
| | - Ernesto G. Occhiato
- Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino (FI), Italy
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18
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Chandra A, Yadav NR, Moorthy JN. Facile synthesis of isatins by direct oxidation of indoles and 3-iodoindoles using NIS/IBX. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.02.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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19
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Bock J, Daniliuc CG, Hennecke U. Stable Bromiranium Ion Salts as Reagents for Biomimetic Indole Terpenoid Cyclizations. Org Lett 2019; 21:1704-1707. [DOI: 10.1021/acs.orglett.9b00259] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jonathan Bock
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
| | - Ulrich Hennecke
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Correnssstrasse 40, 48149 Münster, Germany
- Organic Chemistry Research Group, Departments of Chemistry and Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Elsene, Belgium
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Rinaldi A, Petrović M, Magnolfi S, Scarpi D, Occhiato EG. Pentannulation Reaction by Tandem Gold(I)-Catalyzed Propargyl Claisen Rearrangement/Nazarov Cyclization of Enynyl Vinyl Ethers. Org Lett 2018; 20:4713-4717. [DOI: 10.1021/acs.orglett.8b02141] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonia Rinaldi
- Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Florence, Italy
| | - Martina Petrović
- Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Florence, Italy
| | - Stefano Magnolfi
- Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Florence, Italy
| | - Dina Scarpi
- Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Florence, Italy
| | - Ernesto G. Occhiato
- Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino (FI), Florence, Italy
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21
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Vivekanand T, Satpathi B, Bankar SK, Ramasastry SSV. Recent metal-catalysed approaches for the synthesis of cyclopenta[ b]indoles. RSC Adv 2018; 8:18576-18588. [PMID: 35541103 PMCID: PMC9080641 DOI: 10.1039/c8ra03480j] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 05/14/2018] [Indexed: 12/15/2022] Open
Abstract
The cyclopenta[b]indole scaffold is ubiquitously present in several bioactive natural products and pharmaceutically interesting compounds. Of the numerous methods known for the synthesis of cyclopenta-fused indoles, this review highlights only the metal-catalysed approaches reported from the year 2015 onwards. This review encompasses our own efforts leading to the synthesis of cyclopentannulated indoles, in addition to the seminal contributions of several other researchers.
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Affiliation(s)
- Thavaraj Vivekanand
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India http://14.139.227.202/faculty/sastry/
| | - Bishnupada Satpathi
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India http://14.139.227.202/faculty/sastry/
| | - Siddheshwar K Bankar
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India http://14.139.227.202/faculty/sastry/
| | - S S V Ramasastry
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India http://14.139.227.202/faculty/sastry/
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Abe T. Nazarov Cyclization of an Indolyl Vinyl Ketone Promoted by Acetyl Chloride and Sodium Iodide: Formal Synthesis of Bruceolline E. HETEROCYCLES 2018. [DOI: 10.3987/com-18-13866] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
The first total synthesis of the bisindole alkaloid raputindole A from the rutaceous plant Raputia simulans is reported. The key step is a Au(I)-catalyzed cyclization that assembles the cyclopenta[f]indole tricycle from a 6-alkynylated indoline precursor. The isobutenyl side chain was installed by Suzuki-Miyaura cross-coupling, followed by a regioselective reduction employing LiDBB. Starting from 6-iodoindole, the sequence needs nine steps and provided (±)-raputindole A in 6.6% overall yield. The absolute configuration of the natural product (+)-raputindole A was determined by quantum chemical calculation of the ECD spectrum.
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Affiliation(s)
- Mario Kock
- TU Braunschweig , Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
| | - Peter G Jones
- TU Braunschweig , Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
| | - Thomas Lindel
- TU Braunschweig , Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
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