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Haberhauer G, Siera H, Semleit N, Kreuzahler M, Wölper C. Gold Catalysis of Non-Conjugated Haloacetylenes. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0040-1706606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractGold-catalyzed reactions of conjugated haloacetylenes are well known and usually result in the formation of addition or dimerization products. Herein, we report a gold-catalyzed reaction of non-conjugated haloacetylenes, which leads exclusively to the halogenated cyclization products. Remarkable is the gold-catalyzed reaction of tritylhaloacetylenes to haloindene derivatives, as mechanistic studies reveal that an 1,2-aryl shift occurs in the initially formed gold complex. The potential functionalization at the halogen atom and the wide scope of these cyclization reactions make them an attractive method for the construction of cyclic systems.
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Semleit N, Kreuzahler M, Haberhauer G. Gold(I)‐Catalyzed Allene–Diene–Alkyne Coupling Reaction to Polycycles. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Nina Semleit
- Institut für Organische Chemie Universität Duisburg‐Essen Universitätsstraße 7 45117 Essen Germany
| | - Mathis Kreuzahler
- Institut für Organische Chemie Universität Duisburg‐Essen Universitätsstraße 7 45117 Essen Germany
| | - Gebhard Haberhauer
- Institut für Organische Chemie Universität Duisburg‐Essen Universitätsstraße 7 45117 Essen Germany
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Synthesis of pterocarpans through palladium-catalyzed oxyarylation of alkoxy-2H-chromenes with o-iodophenols. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Alejo-Armijo A, Salido S, Altarejos JN. Synthesis of A-Type Proanthocyanidins and Their Analogues: A Comprehensive Review. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:8104-8118. [PMID: 32633514 DOI: 10.1021/acs.jafc.0c03380] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Proanthocyanidins (PACs) are oligomers or polymers composed of units of flavanols. A-type PACs are a subclass of PACs characterized by the presence of at least a double linkage between two consecutive monomers of flavanol. These A-type PACs are found in some fruits and spices and possess potential health benefits as a result of their interesting biological activities, and consequently, their isolation and synthesis have given rise to great interest in the past. This review summarizes the synthetic efforts made to obtain both naturally occurring A-type PACs and their structurally simplified analogues. Most of the synthetic protocols reported involve the addition of a π-nucleophilic molecule over a molecule with two electrophilic carbons, such as a chalcone, a flavylium salt, or a flavanol derivative, among others. Synthesis of A-type PACs remains an issue at a very early stage of development compared to that of PACs with single linkages between monomers (B-type PACs), but the advances that are taking place in the last few years point to a significant development of the subject in the near future.
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Affiliation(s)
- Alfonso Alejo-Armijo
- Departamento de Quı́mica Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus de Excelencia Internacional Agroalimentario, ceiA3, 23071 Jaén, Spain
| | - Sofía Salido
- Departamento de Quı́mica Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus de Excelencia Internacional Agroalimentario, ceiA3, 23071 Jaén, Spain
| | - Joaquı N Altarejos
- Departamento de Quı́mica Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus de Excelencia Internacional Agroalimentario, ceiA3, 23071 Jaén, Spain
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Schmidt B, Schultze C. A One-Pot Synthesis of Pyranocoumarins Through Microwave-Promoted Propargyl Claisen Rearrangement/Wittig Olefination. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701684] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Bernd Schmidt
- Institut für Chemie; Universität Potsdam; Karl-Liebknecht-Strasse 24-25 14476 Potsdam-Golm Germany
| | - Christiane Schultze
- Institut für Chemie; Universität Potsdam; Karl-Liebknecht-Strasse 24-25 14476 Potsdam-Golm Germany
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Thornbury RT, Saini V, Fernandes TDA, Santiago CB, Talbot EPA, Sigman MS, McKenna JM, Toste FD. The development and mechanistic investigation of a palladium-catalyzed 1,3-arylfluorination of chromenes. Chem Sci 2017; 8:2890-2897. [PMID: 28451354 PMCID: PMC5376715 DOI: 10.1039/c6sc05102b] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Accepted: 01/23/2017] [Indexed: 11/21/2022] Open
Abstract
A mild palladium-catalyzed ligand-controlled regioselective 1,3-arylfluorination of 2[H]-chromenes has been developed.
A mild palladium-catalyzed ligand-controlled regioselective 1,3-arylfluorination of 2[H]-chromenes has been developed. The products with a syn-1,3 substitution pattern were obtained with high enantiomeric excess using a PyrOx ligand, wherein the utility of these pyranyl-fluorides was further demonstrated through their participation in a diastereoselective C–C bond forming reaction. Ligand dependent divergent formation of both the 1,3- and 1,2- alkene difunctionalization products was observed. The nature of this bifurcation was investigated through experimental studies in combination with computational and statistical analysis tools. Ultimately, the site selectivity was found to rely on ligand denticity and metal electrophilicity, the electronics of the boronic acid, and the donor ability of the directing group in the substrate.
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Affiliation(s)
- Richard T Thornbury
- Department of Chemistry , University of California , Berkeley , California 94720 , USA .
| | - Vaneet Saini
- Novartis Institutes for Biomedical Research , Cambridge , Massachusetts 02139 , USA
| | - Talita de A Fernandes
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . .,Instituto de Química , Universidade de Brasília , Campus Universitário Darcy Ribeiro , Caixa Postal: 04478 , 70904-970 , Brasília , DF , Brazil
| | - Celine B Santiago
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , USA
| | - Eric P A Talbot
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . .,Novartis Institutes for Biomedical Research , Cambridge , Massachusetts 02139 , USA
| | - Matthew S Sigman
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , USA
| | - Jeffrey M McKenna
- Novartis Institutes for Biomedical Research , Cambridge , Massachusetts 02139 , USA
| | - F Dean Toste
- Department of Chemistry , University of California , Berkeley , California 94720 , USA .
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Xia L, Cai H, Lee YR. Catalyst-controlled regio- and stereoselective synthesis of diverse 12H-6,12-methanodibenzo[d,g][1,3]dioxocines. Org Biomol Chem 2014; 12:4386-96. [DOI: 10.1039/c4ob00691g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Regio- and stereoselective synthesis of 12H-6,12-methanodibenzo[d,g][1,3]dioxocines has been accomplished by the EDDA and PTSA-catalyzed cascade reactions of resorcinols and 2-hydroxychalcones.
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Affiliation(s)
- Likai Xia
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749, Republic of Korea
| | - Hongyun Cai
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749, Republic of Korea
| | - Yong Rok Lee
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749, Republic of Korea
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(D,L)-10-Camphorsulfonic-Acid-Catalysed Synthesis of Diaryl-Fused 2,8-Dioxabicyclo[3.3.1]nonanes from 2-Hydroxychalcones and Naphthol Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301295] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Jiménez-González L, Hernández-Cervantes C, Álvarez-Corral M, Muñoz-Dorado M, Rodríguez-García I. Synthesis of Pterocarpans. Nat Prod Commun 2011. [DOI: 10.1177/1934578x1100600414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The total synthesis of natural pterocarpans and analogs is reviewed.
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Lykakis IN, Efe C, Gryparis C, Stratakis M. Ph3PAuNTf2 as a Superior Catalyst for the Selective Synthesis of 2H-Chromenes: Application to the Concise Synthesis of Benzopyran Natural Products. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001674] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Appukkuttan P, Van der Eycken E. Microwave-Assisted Natural Product Chemistry. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/128_051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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Ashry EE, Kassem A, Ramadan E. Microwave Irradiation for Accelerating Organic Reactions – Part II: Six-, Seven-Membered, Spiro, and Fused Heterocycles. ADVANCES IN HETEROCYCLIC CHEMISTRY 2006. [DOI: 10.1016/s0065-2725(05)90001-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Subburaj K, Trivedi GK. Microwave-Assisted Rate-Enhanced Method for the Synthesis of 2,2-Dimethyl-2H-chromenes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1999. [DOI: 10.1246/bcsj.72.259] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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