1
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Cabeza JA, García-Álvarez P, Gómez-Gallego M, Sierra MA. Advances in the synthesis and reactivity of group 6 metal allenyls. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2022. [DOI: 10.1016/bs.adomc.2022.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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2
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Yao L, Hu Q, Bao L, Zhu W, Hu Y. Fully Substituted Conjugate Benzofuran Core: Multiyne Cascade Coupling and Oxidation of Cyclopropenone. Org Lett 2021; 23:4971-4975. [PMID: 34114466 DOI: 10.1021/acs.orglett.1c01304] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An unprecedented C═C double bond cleavage of cyclopropenone and dioxygen activation by multiyne cascade coupling has been developed. This chemistry provides a novel, simple, and efficient approach to synthesize fully substituted conjugate benzofuran derivatives from simple substrates under mild conditions. The density functional theory (DFT) calculations reveal that the unique homolytic cleavages of cyclopropenone and molecular oxygen are crucial to the success of this reaction.
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Affiliation(s)
- Liangliang Yao
- Key Laboratory of Functional Molecular Solids, Ministry of Education; Anhui Laboratory of Molecule-Based Materials, State Laboratory Cultivation Base, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Qiong Hu
- Key Laboratory of Functional Molecular Solids, Ministry of Education; Anhui Laboratory of Molecule-Based Materials, State Laboratory Cultivation Base, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Li Bao
- Key Laboratory of Functional Molecular Solids, Ministry of Education; Anhui Laboratory of Molecule-Based Materials, State Laboratory Cultivation Base, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Wenjing Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education; Anhui Laboratory of Molecule-Based Materials, State Laboratory Cultivation Base, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Yimin Hu
- Key Laboratory of Functional Molecular Solids, Ministry of Education; Anhui Laboratory of Molecule-Based Materials, State Laboratory Cultivation Base, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
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3
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Feliciano A, Vázquez JL, Benítez-Puebla LJ, Velazco-Cabral I, Cruz Cruz D, Delgado F, Vázquez MA. Fischer Carbene Complexes: A Glance at Two Decades of Research on Higher-Order Cycloaddition Reactions. Chemistry 2021; 27:8233-8251. [PMID: 33871119 DOI: 10.1002/chem.202005434] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Indexed: 01/06/2023]
Abstract
The structure of Fischer carbene complexes (FCCs) is electron deficient. If bearing an α,β-unsaturated system, it can generate a wide variety of compounds by undergoing many different transformations, including higher-order cycloadditions. The latter are described as pericyclic reactions in which more than six electrons participate. These reactions have been employed in various areas of organic synthesis, resulting in highly selective compounds with a broad range of scaffolds. The first studies on higher-order cycloadditions involving FCCs frequently yielded competing byproducts. Many groups have attempted to increase selectivity by exploring distinct reaction conditions, reagents and co-catalysts (e. g., metal-mediated cycloadditions). The present review is the first to focus exclusively on using higher-order cycloadditions involving FCCs to synthesize carbocycles and heterocycles. Based on two decades of reports, an analysis is made of the main aspects of the mechanisms proposed for higher-order cycloadditions and the structural diversity obtained by the substituent effect.
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Affiliation(s)
- Alberto Feliciano
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
| | - Juan L Vázquez
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
| | - Luis J Benítez-Puebla
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
| | - Iván Velazco-Cabral
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
| | - David Cruz Cruz
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
| | - Francisco Delgado
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. Carpio y Plan de Ayala S/N, 11340, Cd. de Mexico, Mexico
| | - Miguel A Vázquez
- Departamento de Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Gto, Mexico
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4
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Zhang L, Cao T, Jiang H, Zhu S. Deconstructive Reorganization: De Novo Synthesis of Hydroxylated Benzofuran. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ling Zhang
- Key Laboratory of Functional Molecular Engineering of Guangdong ProvinceSchool of Chemistry and Chemical EngineeringSouth China University of Technology 510640 Guangzhou China
| | - Tongxiang Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong ProvinceSchool of Chemistry and Chemical EngineeringSouth China University of Technology 510640 Guangzhou China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong ProvinceSchool of Chemistry and Chemical EngineeringSouth China University of Technology 510640 Guangzhou China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong ProvinceSchool of Chemistry and Chemical EngineeringSouth China University of Technology 510640 Guangzhou China
- State Key Laboratory of Elemento-Organic ChemistryNankai University 300071 Tianjing China
- Singfar Laboratories 510670 Guangzhou China
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5
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Zhang L, Cao T, Jiang H, Zhu S. Deconstructive Reorganization: De Novo Synthesis of Hydroxylated Benzofuran. Angew Chem Int Ed Engl 2020; 59:4670-4677. [PMID: 31961991 DOI: 10.1002/anie.201915212] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/18/2020] [Indexed: 12/26/2022]
Abstract
An unprecedented deconstructive reorganization strategy for the de novo synthesis of hydroxylated benzofurans from kojic acid- or maltol-derived alkynes is reported. In this reaction, both the benzene and furan rings were simultaneously constructed, whereas the pyrone moiety of the kojic acid or maltol was deconstructed and then reorganized into the benzene ring as a six-carbon component. Through this strategy, at least one free hydroxyl group was introduced into the benzene ring in a substitution-pattern tunable fashion without protection-deprotection and redox adjustment. With this method, a large number of hydroxylated benzofuran derivatives with different substitution-patterns have been prepared efficiently. This methodology has also been shown as the key step in a collective total synthesis of hydroxylated benzofuran-containing natural products (11 examples).
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Affiliation(s)
- Ling Zhang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China
| | - Tongxiang Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjing, China.,Singfar Laboratories, 510670, Guangzhou, China
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6
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Lvov AG, Kavun AM, Kachala VV, Lyssenko KA, Shirinian VZ. Photorearrangement of dihetarylethenes as a tool for the benzannulation of heterocycles. Org Biomol Chem 2019; 17:4990-5000. [PMID: 30964495 DOI: 10.1039/c9ob00690g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A general strategy for the preparative benzannulation of aromatic heterocycles via photocyclization of 1,2-dihetarylethenes was proposed for the first time. The strategy includes two steps, namely, modular assembly of dihetarylethenes from widely available 3-hetarylacetic acids and 2-bromo-1-hetarylethanones, and subsequent preparative photorearrangement (using a UV lamp at 365 nm as the light source). This approach is efficient for the annulation of a wide range of heterocycles and provides C-, N-, O- or S-substituents in the benzoheterocycles obtained. The photochemical step is a metal-, acid-, and oxidant-free reaction, which requires non-inert conditions, and can be easily monitored by NMR spectroscopy. Applicability of the proposed strategy was tested in the synthesis of a wide range of substituted carbazoles and benzo[b]thiophenes as well as on a gram-scale benzannulation of 3-indoleacetic acid. Our study disclosed how to overcome two notable obstacles to the successful photorearrangement of dihetarylethenes: undesired reactions associated with photogenerated singlet oxygen, and the instability of desired products. The first problem was successfully solved by the addition of DABCO, while development of an in situ alkylation protocol to trap unstable photoproducts allowed us to overcome the second issue.
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Affiliation(s)
- Andrey G Lvov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47, Leninsky prospect, Moscow, Russian Federation.
| | - Alexey M Kavun
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47, Leninsky prospect, Moscow, Russian Federation. and Higher Chemical College, D. I. Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, Moscow, Russian Federation
| | - Vadim V Kachala
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47, Leninsky prospect, Moscow, Russian Federation.
| | - Konstantin A Lyssenko
- Department of Chemistry, Lomonosov Moscow State University, 119992 Moscow, Russian Federation
| | - Valerii Z Shirinian
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47, Leninsky prospect, Moscow, Russian Federation.
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Gómez A, Funes-Ardoiz I, Sampedro D, Santamaría J. Unexpected [4 + 2] Cycloaddition through Chromium Non-Heteroatom-Stabilized Alkynyl Carbene Complexes: Regioselective Access to Substituted 6-Azaindoles. Org Lett 2018; 20:4099-4102. [DOI: 10.1021/acs.orglett.8b01650] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Aránzazu Gómez
- Departamento de Química Orgánica e Inorgánica e Instituto Universitario de Química Organometálica “Enrique Moles”, Unidad Asociada al C.S.I.C. Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Spain
| | - Ignacio Funes-Ardoiz
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Madre de Dios 53, 26006 Logroño, Spain
| | - Diego Sampedro
- Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ), Madre de Dios 53, 26006 Logroño, Spain
| | - Javier Santamaría
- Departamento de Química Orgánica e Inorgánica e Instituto Universitario de Química Organometálica “Enrique Moles”, Unidad Asociada al C.S.I.C. Universidad de Oviedo, C/Julián Clavería 8, 33006 Oviedo, Spain
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8
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Barluenga J, Aguilar E. Group 6 Metal Fischer Carbene Complexes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2017. [DOI: 10.1016/bs.adomc.2017.04.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Li X, Xie H, Fu X, Liu JT, Wang HY, Xi BM, Liu P, Xu X, Tang W. Rhodium(I)-Catalyzed Benzannulation of Heteroaryl Propargylic Esters: Synthesis of Indoles and Related Heterocycles. Chemistry 2016; 22:10410-4. [PMID: 27189811 DOI: 10.1002/chem.201602088] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 11/06/2022]
Abstract
A de novo synthesis of a benzene ring allows for the preparation of a diverse range of heterocycles including indoles, benzofurans, benzothiophenes, carbazoles, and dibenzofurans from simple heteroaryl propargylic esters using a unified carbonylative benzannulation strategy. Multiple substituents can be easily introduced to the C4-C7 positions of indoles and related heterocycles.
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Affiliation(s)
- Xiaoxun Li
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Haibo Xie
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Xiaoning Fu
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, P. R. China
| | - Ji-Tian Liu
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Hao-Yuan Wang
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Bao-Min Xi
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Science, Southern Medical University, Gaungzhou, Guangdong, 510515, P. R. China.
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | - Xiufang Xu
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071, P. R. China.
| | - Weiping Tang
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, USA. .,Department of Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA.
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10
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Funes-Ardoiz I, González J, Santamaría J, Sampedro D. Understanding the Mechanism of the Divergent Reactivity of Non-Heteroatom-Stabilized Chromium Carbene Complexes with Furfural Imines: Formation of Benzofurans and Azetines. J Org Chem 2016; 81:1565-70. [DOI: 10.1021/acs.joc.5b02729] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ignacio Funes-Ardoiz
- Department
of Chemistry, Center for Research in Chemical Synthesis (CISQ), University of La Rioja, Madre de Dios, 53, 26006 Logroño, Spain
| | - Jairo González
- Department
of Organic and Inorganic Chemistry and University Institute of Organometallic
Chemistry “Enrique Moles”, University of Oviedo, C/Julián Clavería, 8, 33006 Oviedo, Spain
| | - Javier Santamaría
- Department
of Organic and Inorganic Chemistry and University Institute of Organometallic
Chemistry “Enrique Moles”, University of Oviedo, C/Julián Clavería, 8, 33006 Oviedo, Spain
| | - Diego Sampedro
- Department
of Chemistry, Center for Research in Chemical Synthesis (CISQ), University of La Rioja, Madre de Dios, 53, 26006 Logroño, Spain
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11
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López J, de la Cruz FN, Flores-Conde MI, Flores-Álamo M, Delgado F, Tamariz J, Vázquez MA. Regioselective Multicomponent Synthesis of 2,4,6-Trisubstituted Phenols from Fischer Alkynyl Carbene Complexes. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501211] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Santamaría J, Aguilar E. Beyond Fischer and Schrock carbenes: non-heteroatom-stabilized group 6 metal carbene complexes – a general overview. Org Chem Front 2016. [DOI: 10.1039/c6qo00206d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Non-heteroatom-stabilized group 6 metal carbene complexes: versatile reagents or intermediates in stoichiometric or catalytic reactions in organic synthesis.
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Affiliation(s)
- Javier Santamaría
- Instituto Universitario de Química Organometálica “Enrique Moles”
- Departamento de Química Orgánica e Inorgánica
- Universidad de Oviedo
- Oviedo
- Spain
| | - Enrique Aguilar
- Instituto Universitario de Química Organometálica “Enrique Moles”
- Departamento de Química Orgánica e Inorgánica
- Universidad de Oviedo
- Oviedo
- Spain
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13
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Stereoisomeric products of electrochemical reduction of heterocyclic Fischer aminocarbene Cr(0) complexes. Development of the electrochemistry-mass spectrometry tandem approach using biphasic (acetonitrile-hexane) preparative electrolysis. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.10.110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Funes-Ardoiz I, Sampedro D. Computational Assessment of Non-Heteroatom-Stabilized Carbene Complexes Reactivity: Formation of Oxazine Derivatives. J Org Chem 2014; 79:11824-8. [DOI: 10.1021/jo5023684] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ignacio Funes-Ardoiz
- Departamento de Química, Universidad de La Rioja, Centro de Investigación
en Síntesis Química
(CISQ), Madre de Dios,
51, 26006 Logroño, Spain
| | - Diego Sampedro
- Departamento de Química, Universidad de La Rioja, Centro de Investigación
en Síntesis Química
(CISQ), Madre de Dios,
51, 26006 Logroño, Spain
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15
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González J, Gómez A, Funes-Ardoiz I, Santamaría J, Sampedro D. Intermolecular and Regioselective Access to Polysubstituted Benzo- and Dihydrobenzo[c]azepine Derivatives: Modulating the Reactivity of Group 6 Non-Heteroatom-Stabilized Alkynyl Carbene Complexes. Chemistry 2014; 20:7061-8. [DOI: 10.1002/chem.201400281] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Indexed: 11/05/2022]
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16
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Dawande SG, Kanchupalli V, Kalepu J, Chennamsetti H, Lad BS, Katukojvala S. Rhodium Enalcarbenoids: Direct Synthesis of Indoles by Rhodium(II)-Catalyzed [4+2] Benzannulation of Pyrroles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400161] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Dawande SG, Kanchupalli V, Kalepu J, Chennamsetti H, Lad BS, Katukojvala S. Rhodium enalcarbenoids: direct synthesis of indoles by rhodium(II)-catalyzed [4+2] benzannulation of pyrroles. Angew Chem Int Ed Engl 2014; 53:4076-80. [PMID: 24590818 DOI: 10.1002/anie.201400161] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Indexed: 11/11/2022]
Abstract
Disclosed herein is the design of an unprecedented electrophilic rhodium enalcarbenoid which results from rhodium(II)-catalyzed decomposition of a new class of enaldiazo compounds. The synthetic utility of these enalcarbenoids has been successfully demonstrated in the first transition-metal-catalyzed [4+2] benzannulation of pyrroles, thus leading to substituted indoles. The new benzannulation has been applied to the efficient synthesis of the natural product leiocarpone as well as a potent adipocyte fatty-acid binding protein inhibitor.
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Affiliation(s)
- Sudam Ganpat Dawande
- Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh 462066 (India) http://home.iiserbhopal.ac.in/∼sk/
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2009. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.07.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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20
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Tandem catalysis in ionic liquids: a recyclable catalytic synthesis of benzofuran derivatives. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.109] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Gabriele B, Mancuso R, Salerno G. Acid-Catalysed or Radical-Promoted Allylic Substitution of 2-Methylene-2,3-dihydrobenzofuran-3-ols with Thiol Derivatives: a Novel and Expedient Synthesis of 2-(Thiomethyl)benzofurans. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000289] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Bochicchio A, Chiummiento L, Funicello M, Lopardo MT, Lupattelli P. Efficient synthesis of 5-nitro-benzo[b]furans via 2-bromo-4-nitro-phenyl acetates. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.03.072] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Barluenga J, Gómez A, Santamaría J, Tomás M. Sequential Five-Component Construction of the Cyclopenta[e][1,3]oxazine Skeleton using Stable 2-Azetine Derivatives. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906357] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Barluenga J, Gómez A, Santamaría J, Tomás M. Sequential Five-Component Construction of the Cyclopenta[e][1,3]oxazine Skeleton using Stable 2-Azetine Derivatives. Angew Chem Int Ed Engl 2010; 49:1306-8. [DOI: 10.1002/anie.200906357] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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