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Novel d-Annulated Pentacyclic Steroids: Regioselective Synthesis and Biological Evaluation in Breast Cancer Cells. Molecules 2020; 25:molecules25153499. [PMID: 32752019 PMCID: PMC7435891 DOI: 10.3390/molecules25153499] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 12/19/2022] Open
Abstract
The acid-catalyzed cyclization of benzylidenes based on 16-dehydropregnenolone acetate (16-DPA) was studied. It was found that these compounds readily undergo regioselective interrupted Nazarov cyclization with trapping chloride ion and an efficient method of the synthesis of d-annulated pentacyclic steroids based on this reaction was proposed. The structures of the synthesized pentacyclic steroids were determined by NMR and X-ray diffraction. It was found that the reaction affords a single diastereomer, but the latter can crystallize as two conformers depending on the structure. Antiproliferative activity of synthesized compounds was evaluated against two breast cancer cell lines: MCF-7 and MDA-MB-231. All tested compounds showed relatively high antiproliferative activity. The synthetic potential of the protocol developed was illustrated by the gram-scale experiment.
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2
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Sugimoto K, Oshiro M, Hada R, Matsuya Y. 2,2'-Biphenol/B(OH) 3 Catalyst System for Nazarov Cyclization. Chem Pharm Bull (Tokyo) 2019; 67:1019-1022. [PMID: 31474725 DOI: 10.1248/cpb.c19-00399] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A novel catalyst system-a combination of the readily available 2,2'-biphenol with the inexpensive, nontoxic, and eco-friendly B(OH)3-promoted the Nazarov cyclization of activated and inactivated divinyl ketones to afford the corresponding cyclopentenones up to 96% yield under, in a cis-selective manner. Compared with the conventional harsh conditions with hazardous reagents, user-friendly method was established with bench-stable and easy-to-handle reagents.
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Affiliation(s)
- Kenji Sugimoto
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Miyu Oshiro
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Ryuhei Hada
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Yuji Matsuya
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
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3
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Holt C, Alachouzos G, Frontier AJ. Leveraging the Halo-Nazarov Cyclization for the Chemodivergent Assembly of Functionalized Haloindenes and Indanones. J Am Chem Soc 2019; 141:5461-5469. [DOI: 10.1021/jacs.9b00198] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Connor Holt
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
| | - Georgios Alachouzos
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
| | - Alison J. Frontier
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
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Ashley WL, Timpy EL, Coombs TC. Flow Photo-Nazarov Reactions of 2-Furyl Vinyl Ketones: Cyclizing a Class of Traditionally Unreactive Heteroaromatic Enones. J Org Chem 2018; 83:2516-2529. [PMID: 29400058 DOI: 10.1021/acs.joc.7b03171] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Nazarov reactions of 2-furyl vinyl ketones and related heteroaromatic enones, to produce furan-fused cyclopentanones using a flow photochemical approach, are described. Compounds possessing this connectivity between heterocycle and ketone (2-furyl, 2-benzofuryl, 2-thiophene-yl, and 2-benzothiophene-yl) have traditionally proven difficult or impossible to cyclize with typical Brønsted and Lewis acid mediated methods. Using mild flow photochemistry conditions and acetic acid (AcOH) or hexafluoroisopropanol (HFIP) as solvent, these compounds were found to cyclize in 45-97% yields, with typical UV exposure times of 3.4-6.8 min. In all cases, 2-furyl and 2-thiophene-yl enones cyclized, whereas 2-benzofuryl and 2-benzothiophene-yl enones exhibited divergent properties with reactivity patterns tied to the identity of the vinyl group. This report discloses the first photo-Nazarov reactions of tetrahydropyridine-substituted 2-furyl ketones, providing a direct approach to the corresponding fused heterocyclic motifs built around a central cyclopentanone. These motifs constitute the core structures of biologically active natural products, including the marine alkaloid nakadomarin A.
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Affiliation(s)
- William L Ashley
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington , Dobo Hall, Wilmington, North Carolina 28403, United States
| | - Evan L Timpy
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington , Dobo Hall, Wilmington, North Carolina 28403, United States
| | - Thomas C Coombs
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington , Dobo Hall, Wilmington, North Carolina 28403, United States
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Affiliation(s)
- Kolluru Srinivas
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Chepuri V. Ramana
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
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Manchala N, Law HYL, Kerr DJ, Volpe R, Lepage RJ, White JM, Krenske EH, Flynn BL. Multistereocenter-Containing Cyclopentanoids from Ynamides via Oxazolidinone-Controlled Nazarov Cyclization. J Org Chem 2017; 82:6511-6527. [PMID: 28511015 DOI: 10.1021/acs.joc.7b00082] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Achieving ready-enantioselective access to multistereocenter-containing cyclopentyl rings is an area of great significance to organic synthesis. In this work, we describe a general protocol for accessing multistereocenter-containing cyclopentanoids from simple N-alkynyloxazolidinones (Ox-ynamides). This protocol involves conversion of Ox-ynamides into Ox-activated divinyl and aryl vinyl ketones that undergo facile Nazarov cyclization with excellent chemo-, regio-, and stereocontrol. The Ox auxiliary directs all aspects of reactivity and selectivity, both in the electrocyclization and in the subsequent transformations of the resulting oxyallyl intermediate. Stereoinduction in the electrocyclization results from a "coupled-torque" mechanism in which rotation of the Ox group, driven by increasing orbital overlap of the nitrogen lone pair with the incipient oxyallyl cation, is coupled with the rotation of the termini of the pentadienyl cation, favoring a particular direction of conrotatory ring closure (torquoselectivity). The associated lone-pair stabilization of the transition state by Ox promotes cyclization of traditionally resistant substrates, broadening the scope of this asymmetric Nazarov cyclization. The Ox group also facilitates the stereo- and regioselective incorporation of nucleophiles (Nu) and dienes, giving more complex, multistereocenter containing cyclopentanoids. Finally, the Ox group is readily removed and recovered or can be converted into other amine functionalities.
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Affiliation(s)
- Narasimhulu Manchala
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Hanson Y L Law
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Daniel J Kerr
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Rohan Volpe
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Romain J Lepage
- School of Chemistry and Molecular Biosciences, The University of Queensland , Brisbane, Queensland 4072, Australia
| | - Jonathan M White
- Bio21 Institute, School of Chemistry, University of Melbourne , Parkville, Victoria 3010, Australia
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland , Brisbane, Queensland 4072, Australia
| | - Bernard L Flynn
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
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Jana N, Driver TG. Assembly of functionalized carbocycles or N-heterocycles through a domino electrocyclization-[1,2] migration reaction sequence. Org Biomol Chem 2016; 13:9720-41. [PMID: 26275170 DOI: 10.1039/c5ob01334h] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The development of processes that streamline the synthesis of complex, functionalized carbocycles and heterocycles remains a hotly pursued topic because their scaffolds are present in a range of bioactive molecules and electronic materials. Although the Nazarov reaction has emerged to be useful in the synthesis of carbocycles and heterocycles, using an electrocyclization to trigger a migration remains underdeveloped. By constructing several bonds in one operation, domino reaction sequences are particularly effective at improving the efficiency of synthesis. The use of transition metal catalysts has the potential to render these processes stereoselective. This review examines the use of electrocyclization-[1,2] migrations to construct molecules and is organized by the type of ring constructed and the order of the two steps in this process.
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Affiliation(s)
- Navendu Jana
- University of Illinois at Chicago, Department of Chemistry, 845 West Taylor Street, Chicago, IL 60607, USA.
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He C, Wang J, Gu Z. BF3·OEt2-Promoted Synthesis of 2,3-Metallocenocyclohexanones: A 1,2-Hydride Shift and Cationic Cyclization Strategy. J Org Chem 2015. [DOI: 10.1021/acs.joc.5b01511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Congfa He
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China
| | - Jie Wang
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China
| | - Zhenhua Gu
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China
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Wenz DR, Read de Alaniz J. The Nazarov Cyclization: A Valuable Method to Synthesize Fully Substituted Carbon Stereocenters. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402825] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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Germain N, Schlaefli D, Chellat M, Rosset S, Alexakis A. Domino Asymmetric Conjugate Addition–Conjugate Addition. Org Lett 2014; 16:2006-9. [DOI: 10.1021/ol5005752] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolas Germain
- Department of Organic Chemistry, University of Geneva, Quai Ernest
Ansermet, 30, 1211 Geneva 4, Switzerland
| | - Doriane Schlaefli
- Department of Organic Chemistry, University of Geneva, Quai Ernest
Ansermet, 30, 1211 Geneva 4, Switzerland
| | - Mathieu Chellat
- Department of Organic Chemistry, University of Geneva, Quai Ernest
Ansermet, 30, 1211 Geneva 4, Switzerland
| | - Stéphane Rosset
- Department of Organic Chemistry, University of Geneva, Quai Ernest
Ansermet, 30, 1211 Geneva 4, Switzerland
| | - Alexandre Alexakis
- Department of Organic Chemistry, University of Geneva, Quai Ernest
Ansermet, 30, 1211 Geneva 4, Switzerland
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11
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Vaidya T, Cheng R, Carlsen PN, Frontier AJ, Eisenberg R. Cationic cyclizations and rearrangements promoted by a heterogeneous gold catalyst. Org Lett 2014; 16:800-3. [PMID: 24432741 PMCID: PMC3969096 DOI: 10.1021/ol403542k] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Indexed: 12/02/2022]
Abstract
A heterogeneous gold catalyst with remarkable activity for promoting the electrophilic reactions of aryl vinyl ketones and aryl dienyl ketones is described. The catalyst is easy to prepare, is robust, and can be recycled. Low loadings are effective for different types of cationic reactions, including Nazarov cyclizations, lactonizations, and [1,2] shifts.
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Affiliation(s)
- Tulaza Vaidya
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Ryan Cheng
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Peter N. Carlsen
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Alison J. Frontier
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Richard Eisenberg
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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12
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Li E, Li C, Wang J, Wang J, Dong L, Guo X, Song C, Chang J. Lewis acid-catalyzed tandem acylation–Nazarov cyclization for the syntheses of fused cyclopentenones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Joy S, Nakanishi W, West F. Hydroxylic additives enhance yield and scalability of silicon-directed Nazarov reaction. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.139] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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14
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Masuyama Y, Miyazaki K, Suzuki N. Cyclotrimerization of Terminal Alkynes Catalyzed by a Phosphine-Free Chloro(1,5-cyclooctadiene)iridium(I) Dimer and Induced by Tin(II) Chloride. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Naredla RR, Klumpp DA. Contemporary Carbocation Chemistry: Applications in Organic Synthesis. Chem Rev 2013; 113:6905-48. [DOI: 10.1021/cr4001385] [Citation(s) in RCA: 263] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Rajasekhar Reddy Naredla
- Department of Chemistry
and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115,
United States
| | - Douglas A. Klumpp
- Department of Chemistry
and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115,
United States
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Du J, Zhou B, Yang Y, Li Y. Rhodium(III)-Catalyzed Synthesis of Cyclopenta[b]pyrroles from 1,2-Diketones, 2-Aminopyridine, and Alkynes. Chem Asian J 2013; 8:1386-90. [DOI: 10.1002/asia.201300341] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 04/05/2013] [Indexed: 01/13/2023]
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17
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Li W, Li Y, Zhou G, Wu X, Zhang J. Gold(I)-Catalyzed Regiodivergent Rearrangements: 1,2- and 1,2′-Alkyl Migration in Skipped Alkynyl Ketones. Chemistry 2012; 18:15113-21. [DOI: 10.1002/chem.201201727] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Indexed: 11/06/2022]
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Guo F, Wang L, Mao S, Zhang C, Yu J, Han J. Cationic bromonium complex: NBS/P(OPh)3 as an efficient catalyst for Nazarov cyclization. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.06.107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kerr DJ, Miletic M, Chaplin JH, White JM, Flynn BL. Oxazolidinone-promoted, torquoselective Nazarov cyclizations. Org Lett 2012; 14:1732-5. [PMID: 22455473 DOI: 10.1021/ol300316a] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxazolidinones are powerful promoters of the Nazarov reaction, enabling the cyclization of conventionally resistant substrates to be achieved under mild conditions. They exert excellent regio- and torquoselective control in both the conventional Nazarov reaction giving cyclopentenones and in the "interrupted" Nazarov reaction, giving more highly substituted multistereocenter containing products.
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Affiliation(s)
- Daniel J Kerr
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
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Maity AK, Roy S. A Multimetallic Piano-Stool Ir–Sn3 Catalyst for Nucleophilic Substitution Reaction of γ-Hydroxy Lactams through N-Acyliminium Ions. J Org Chem 2012; 77:2935-41. [DOI: 10.1021/jo202359e] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Arnab Kumar Maity
- Organometallics & Catalysis Laboratory, Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Sujit Roy
- School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 751013,
India
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Yeung KS, Peng XS, Wu J, Hou XL. Five-Membered Ring Systems: Furans and Benzofurans. PROGRESS IN HETEROCYCLIC CHEMISTRY 2012. [DOI: 10.1016/b978-0-08-096807-0.00007-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Patil DV, Cavitt MA, France S. Diastereoselective Intramolecular Friedel–Crafts Cyclizations of Substituted Methyl 2-(1H-indole-1-carbonyl)acrylates: Efficient Access to Functionalized 1H-Pyrrolo[1,2-a]indoles. Org Lett 2011; 13:5820-3. [DOI: 10.1021/ol202431x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dadasaheb V. Patil
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Marchello A. Cavitt
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Stefan France
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Xu X, Hu WH, Zavalij PY, Doyle MP. Divergent Outcomes of Carbene Transfer Reactions from Dirhodium- and Copper-Based Catalysts Separately or in Combination. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105557] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Xu X, Hu WH, Zavalij PY, Doyle MP. Divergent outcomes of carbene transfer reactions from dirhodium- and copper-based catalysts separately or in combination. Angew Chem Int Ed Engl 2011; 50:11152-5. [PMID: 25097911 DOI: 10.1002/anie.201105557] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xinfang Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
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Xu T, Yang Q, Ye W, Jiang Q, Xu Z, Chen J, Yu Z. Substituent‐Dependent, Iron‐Mediated Tandem Cyclization of Diynes with Benzaldehyde Acetals to Form Highly Functionalized Indene Derivatives. Chemistry 2011; 17:10547-51. [DOI: 10.1002/chem.201101667] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tongyu Xu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Qin Yang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Wenjing Ye
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Quanbin Jiang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Zhaoqing Xu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Jiping Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
| | - Zhengkun Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023 (P.R. China), Fax: (+86) 411‐8437‐9227
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry (CAS), 354 Fenglin Road, Shanghai 200032 (P. R. China)
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Patil DV, Cavitt MA, Grzybowski P, France S. An efficient synthesis of hydropyrido[1,2-a]indole-6(7H)-ones via an In(iii)-catalyzed tandem cyclopropane ring-opening/Friedel–Crafts alkylation sequence. Chem Commun (Camb) 2011; 47:10278-80. [DOI: 10.1039/c1cc14131g] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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