1
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Chen P, Wu H, Li Y, Tang Y. Total syntheses of (+)-arisugacins F, G. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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2
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Acharyya RK, Rej RK, Nanda S. Exploration of Ring Rearrangement Metathesis Reaction: A General and Flexible Approach for the Rapid Construction [5,n]-Fused Bicyclic Systems en Route to Linear Triquinanes. J Org Chem 2018; 83:2087-2103. [PMID: 29308638 DOI: 10.1021/acs.joc.7b03021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structurally diverse [5,n] bicyclic systems with cis ring junction stereochemistry were accessed readily through RRM (ring rearrangement metathesis) reaction of properly functionalized [2.2.1]norbornene skeletons. Several bicyclic enones, ketones, alcohols, and ethers acted as the substrates and yielded the respective linearly fused [5,n] bicyclic systems stereoselectively after the RRM reaction. Such [5,5]bicyclic enone scaffolds were then synthetically manipulated to core structural analogue of naturally occurring liner triquinane hirsutene having cis-syn-cis stereochemistry.
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Affiliation(s)
- Ranjan Kumar Acharyya
- Department of Chemistry, Indian Institute Technology Kharagpur , Kharagpur 721302, India
| | - Rohan Kalyan Rej
- Department of Chemistry, Indian Institute Technology Kharagpur , Kharagpur 721302, India
| | - Samik Nanda
- Department of Chemistry, Indian Institute Technology Kharagpur , Kharagpur 721302, India
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3
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Jiang XL, Shi Y, Tian WS. Synthesis of 18-Demethoxy Analogues of the Aglycon of Saundersiosides A and B, Based on a Cascade Process. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xiao-Ling Jiang
- Key Laboratory of Synthetic Chemistry of Natural Substances; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Yong Shi
- Key Laboratory of Synthetic Chemistry of Natural Substances; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Wei-Sheng Tian
- Key Laboratory of Synthetic Chemistry of Natural Substances; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
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4
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Danda A, Kesava-Reddy N, Golz C, Strohmann C, Kumar K. Asymmetric Roadmap to Diverse Polycyclic Benzopyrans via Phosphine-Catalyzed Enantioselective [4 + 2]-Annulation Reaction. Org Lett 2016; 18:2632-5. [DOI: 10.1021/acs.orglett.6b01030] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Adithi Danda
- Max-Planck-Institut für Molekulare Physiologie, Abteilung
Chemische Biologie, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
- Fakultät
Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany
| | - Naredla Kesava-Reddy
- Max-Planck-Institut für Molekulare Physiologie, Abteilung
Chemische Biologie, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
| | - Christopher Golz
- Fakultät
Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany
| | - Carsten Strohmann
- Fakultät
Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany
| | - Kamal Kumar
- Max-Planck-Institut für Molekulare Physiologie, Abteilung
Chemische Biologie, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
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5
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Al-Rashid ZF, Hsung RP. A computational view on the significance of E-ring in binding of (+)-arisugacin A to acetylcholinesterase. Bioorg Med Chem Lett 2015; 25:4848-4853. [PMID: 26159481 PMCID: PMC4670034 DOI: 10.1016/j.bmcl.2015.06.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 06/09/2015] [Accepted: 06/11/2015] [Indexed: 01/14/2023]
Abstract
A computational docking study of a series of de novo structural analogs of the highly potent, non-nitrogen containing, acetylcholinesterase inhibitor (+)-arisugacin A is presented. In direct comparison to the recently reported X-ray single-crystal structure of (+)-territrem B bound hAChE, the modeling suggests that there is a unique conformational preference for the E-ring that is responsible for the superior inhibitory activity of (+)-arisugacin A against hAChE relative to (+)-territrem B, and that substitutions on the E-ring also play an important role in the protein-ligand interaction.
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Affiliation(s)
- Ziyad F Al-Rashid
- Alchemical Research, LLC, 260 East Wall Street, Bethlehem, PA 18018, USA.
| | - Richard P Hsung
- Division of Pharmaceutical Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, WI 53705, USA.
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6
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Lone SH, Bhat KA. Hemisynthesis of a naturally occurring clinically significant antitumor arglabin from ludartin. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Martín-Santos C, Jarava-Barrera C, del Pozo S, Parra A, Díaz-Tendero S, Mas-Ballesté R, Cabrera S, Alemán J. Highly Enantioselective Construction of Tricyclic Derivatives by the Desymmetrization of Cyclohexadienones. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402853] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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8
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Martín-Santos C, Jarava-Barrera C, del Pozo S, Parra A, Díaz-Tendero S, Mas-Ballesté R, Cabrera S, Alemán J. Highly Enantioselective Construction of Tricyclic Derivatives by the Desymmetrization of Cyclohexadienones. Angew Chem Int Ed Engl 2014; 53:8184-9. [DOI: 10.1002/anie.201402853] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 05/01/2014] [Indexed: 11/10/2022]
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9
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Rad-Moghadam K, Sharifi-Kiasaraie M, Azimi SC. Synthesis of 4-substituted pyrano[4,3-b]pyran-2,5-diones in an ionic liquid. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.113] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Buchanan GS, Cole KP, Li G, Tang Y, You LF, Hsung RP. Constructing the Architecturally Distinctive ABD-Tricycle of Phomactin A through an Intramolecular Oxa-[3 + 3] Annulation Strategy. Tetrahedron 2011; 67:10105-10118. [PMID: 23750054 PMCID: PMC3676308 DOI: 10.1016/j.tet.2011.09.111] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Our efforts in constructing the ABD-ring of phomactin A through an intramolecular oxa-[3 + 3] annulation strategy is described. This struggle entailed finding a practical and efficient preparation of annulation precursor, and a realization of the unexpected competing regioisomeric pathway. The success entailed accessing the A-ring through Diels-Alder cycloaddition of Rawal's diene. Furthermore, the discovery that the regioisomers from the annulation existed as atropisomers with respect to the D-ring olefin and that they could be equilibrated to the desired ABD-tricycle, allowing large quantities of tricycle to be accessed.
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Affiliation(s)
- Grant S Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705 USA
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11
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Buchanan GS, Cole KP, Tang Y, Hsung RP. Total synthesis of (±)-phomactin A. Lessons learned from respecting a challenging structural topology. J Org Chem 2011; 76:7027-39. [PMID: 21819039 PMCID: PMC3163054 DOI: 10.1021/jo200936r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Our struggles and ultimate success in achieving a total synthesis of phomactin A are described. Our strategy features an intramolecular oxa-[3 + 3] annulation to construct its unique ABD-tricyclic manifold. Although the synthesis would constitute a distinctly new approach with the 12-membered D-ring of phomactin A being assembled simultaneously with the 1-oxadecalin at an early stage, the ABD-tricycle represents a unique structural topology that would pose a number of unprecedented challenges. One challenge concerned elaborating this tricycle to have oxygenation at the proper carbon atoms. To overcome this, we would utilize a Kornblum-DeLaMare ring-opening of a peroxide bridge as well as a challenging late-stage 1,3-allylic alcohol transposition. Further, the structural intricacies of the ABD-tricycle were uncovered by a conformational analysis that would be critical for the C5a-homologation.
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Affiliation(s)
- Grant S. Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry University of Wisconsin, Madison, WI 53705
| | - Kevin P. Cole
- Chemical Product R&D, Eli Lilly and Company, Indianapolis, IN 46284
| | - Yu Tang
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072 P. R. China
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry University of Wisconsin, Madison, WI 53705
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12
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Al-Rashid ZF, Hsung RP. (+)-Arisugacin A--computational evidence of a dual binding site covalent inhibitor of acetylcholinesterase. Bioorg Med Chem Lett 2011; 21:2687-91. [PMID: 21216144 PMCID: PMC3082004 DOI: 10.1016/j.bmcl.2010.12.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 12/04/2010] [Accepted: 12/07/2010] [Indexed: 01/14/2023]
Abstract
A computation docking study of the highly potent, non-nitrogen containing, acetylcholinesterase inhibitor (+)-arisugacin A is presented. The model suggests that (+)-arisugacin A is a dual binding site covalent inhibitor of AChE. These findings are examined in the context of Alzheimer's disease-modifying therapeutic design. (+)-Arisugacin A's revealed mode of action is unique, and may serve as a basis for the development of AD therapeutics capable of treating the symptomatic aspects of AD, while being neuroprotective with long term efficacy.
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Affiliation(s)
- Ziyad F. Al-Rashid
- Alchemical Research, LLC, 426 Heckewelder Place, Bethlehem, Pennsylvania 18018, USA
| | - Richard P Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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13
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Abstract
A total synthesis of (+/-)-phomactin A is described to highlight the final completion of a complex natural product target that had commenced with an intramolecular oxa-[3 + 3] annulation strategy in the construction of the ABD-tricycle. These efforts reveal structural intricacies of this ABD-tricycle with an illustrative example being the conformational analysis that was ultimately critical for the C5a-homolgation.
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Affiliation(s)
- Yu Tang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Kevin P. Cole
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Grant S. Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Gang Li
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
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14
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You LF, Hsung RP, Bedermann AA, Kurdyumov AV, Tang Y, Buchanan GS, Cole KP. An Enantioselective Synthesis of the ABD Tricycle for (-)-Phomactin A Featuring Rawal's Asymmetric Diels-Alder Cycloaddition. Adv Synth Catal 2008; 350:10.1002/adsc.200800552. [PMID: 24273477 PMCID: PMC3834967 DOI: 10.1002/adsc.200800552] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An enantioselective synthesis of the ABD-ring of (-)-phomactin A is described here. The sequence features Rawal's asymmetric Diels-Alder cycloaddition. The overall length is significantly reduced from our previous attempt.
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Affiliation(s)
- Ling-Feng You
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Aaron A. Bedermann
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Aleksey V. Kurdyumov
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Yu Tang
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Grant S. Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
| | - Kevin P. Cole
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, WI 53705
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15
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Abstract
An enantioselective total synthesis of (+)-lepadin F is described. The synthetic sequence features an intermolecular aza-[3 + 3] annulation, homologation of a vinylogous amide via Eschenmoser's episulfide contraction, and a highly stereoselective hydrogenation essential for achieving the 1,3-anti relative stereochemistry at C2 and C8a.
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Affiliation(s)
- Gang Li
- Division of Pharmaceutical Sciences and Department of Chemistry, 777 Highland Avenue, University of Wisconsin, Madison, Wisconsin 53705, USA
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16
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Wang Y, Fang DC, Liu RZ. Computational study of intermolecular formal oxa-[3+3] cycloaddition reactions. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2007.11.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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18
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Gerasyuto AI, Hsung RP. An Intramolecular aza-[3 + 3] Annulation Approach to Azaphenalene Alkaloids. Total Synthesis of Myrrhine. J Org Chem 2007; 72:2476-84. [PMID: 17338572 DOI: 10.1021/jo062533h] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A detailed account on the stereoselective total syntheses of azaphenalene alkaloids via an intramolecular aza-[3+3] annulation strategy is described here. All five members of the Coccinellidae family of defensive alkaloids were prepared from the same common intermediate, which was derived from a stereoselective aza-[3+3] annulation reaction.
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Affiliation(s)
- Aleksey I Gerasyuto
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Rennebohm Hall, 777 Highland Avenue, Madison, Wisconsin 53705, USA
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19
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Tang Y, Oppenheimer J, Song Z, You L, Zhang X, Hsung RP. Strategies and approaches for constructing 1-oxadecalins. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.08.054] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Kurdyumov AV, Lin N, Hsung RP, Gullickson GC, Cole KP, Sydorenko N, Swidorski JJ. A Lewis acid-catalyzed formal [3 + 3] cycloaddition of alpha,beta-unsaturated aldehydes with 4-hydroxy-2-pyrone, diketones, and vinylogous esters. Org Lett 2006; 8:191-3. [PMID: 16408872 DOI: 10.1021/ol0523042] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A Lewis acid-catalyzed formal cycloaddition of alpha,beta-unsaturated aldehydes with 6-methyl-4-hydroxy-2-pyrone, 1,3-diketones, and vinylogous silyl esters is described here.
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21
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Kurdyumov AV, Hsung RP. An Unusual Cationic [2 + 2] Cycloaddition in a Divergent Total Synthesis of Hongoquercin A and Rhododaurichromanic Acid A. J Am Chem Soc 2006; 128:6272-3. [PMID: 16683764 DOI: 10.1021/ja054872i] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An unusual polyene cyclization pathway that led to a divergent total synthesis of hongoquercin A and rhododaurichromanic acid A is described here. This work uncovered a unique cationic cyclobutane formation that could be relevant to the biosynthetic pathway for the formation of cyclobutane containing terpenoids in addition to rhododaurichromanic acids.
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Affiliation(s)
- Aleksey V Kurdyumov
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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22
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Sunazuka T, Omura S. Total synthesis of alpha-pyrone meroterpenoids, novel bioactive microbial metabolites. Chem Rev 2006; 105:4559-80. [PMID: 16351054 DOI: 10.1021/cr040628i] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toshiaki Sunazuka
- Kitasato Institute for Life Sciences, Kitasato University, and The Kitasato Institute, Shirokane, Minato-ku, Japan
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23
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24
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Jung ME, Min SJ. Intramolecular Diels−Alder Reactions of Optically Active Allenic Ketones: Chirality Transfer in the Preparation of Substituted Oxa-Bridged Octalones. J Am Chem Soc 2005; 127:10834-5. [PMID: 16076181 DOI: 10.1021/ja052771e] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intramolecular Diels-Alder reaction of allenic ketones containing a furyl unit (IMDAF) to generate oxatricyclic systems in good yields is described. The alkene dienophiles 1ab give poor yields of the cycloadducts 2ab, presumably due to the facile retro Diels-Alder reaction. However, the analogous allenic dienophile 7 afforded the desired cycloadduct 8 in 91% yield on treatment with dimethylaluminum chloride. When the allene bears an alkyl substituent on the terminal carbon, complete diastereoselectivity is seen in the IMDAF, e.g. cyclization of 14 gave only the cycloadduct 15 in 80% yield presumably due to greater steric hindrance in the transition state II as compared to that in I. Finally we report complete chirality transfer of the stereochemistry of an allene to the carbon framework of the oxatricyclic system. Thus, the optically active allenic ketone 20 afforded only the desired cycloadduct 21 with the correct absolute stereochemistry needed for the synthesis of the arisugacin class of natural products.
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Affiliation(s)
- Michael E Jung
- Department of Chemistry and Biochemistry, University of California-Los Angeles, CA 90095-1569, USA.
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25
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Jiang X, Ao L, Zhou C, Yang L, Zhang Q, Li H, Sun L, Wu X, Bai H, Zhao Y. Design, Synthesis, and Biological Evaluation of New Territrem B Analogues. Chem Biodivers 2005; 2:557-67. [PMID: 17192004 DOI: 10.1002/cbdv.200590036] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Some 23 analogues of the potent acetylcholinesterase (AChE) inhibitor territrem B (1) were designed, synthesized, and tested for their biological activities. Some of the new synthetic derivatives exhibited IC50 values for AChE inhibition in the upper micromolar range. Molecular-modeling studies indicated that a planar conformation seems to be crucial for AChE inhibition. The two N-atoms of the piperazine moieties in 5o, 5p, and 5r might further enhance the inhibitory effects. The cytotoxicities of selected compounds against six human tumor cell lines were also determined.
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Affiliation(s)
- Xiangrui Jiang
- Department of Traditional Chinese Medicine and Natural Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310031, PR China
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26
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Zhang Y, Hsung RP, Zhang X, Huang J, Slafer BW, Davis A. Brønsted Acid-Catalyzed Highly Stereoselective Arene-Ynamide Cyclizations. A Novel Keteniminium Pictet−Spengler Cyclization in Total Syntheses of (±)-Desbromoarborescidines A and C. Org Lett 2005; 7:1047-50. [PMID: 15760135 DOI: 10.1021/ol0473391] [Citation(s) in RCA: 173] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A Brønsted acid-catalyzed highly stereoselective arene-ynamide cyclization is described. These reactions constitute a keteniminium variant of Pictet-Spengler cyclizations, leading to efficient synthesis of nitrogen heterocycles and related alkaloids. Total syntheses of desbromoarborescidines A and C are illustrated here as first applications of this methodology.
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Affiliation(s)
- Yanshi Zhang
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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27
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Cole KP, Hsung RP. Unique structural topology and reactivities of the ABD tricycle in phomactin A. Chem Commun (Camb) 2005:5784-6. [PMID: 16307145 DOI: 10.1039/b511338e] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stereoselective and transannular reactivities are described for the ABD tricyclic manifold of phomactin A that possesses a unique structural topology.
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Affiliation(s)
- Kevin P Cole
- Department of Chemistry, University of Minnesota, Minneapolis, 55455-0431, USA
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28
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Hsung R, Kurdyumov A, Sydorenko N. A Formal [3 + 3] Cycloaddition Approach to Natural‐Product Synthesis. European J Org Chem 2004. [DOI: 10.1002/ejoc.200400567] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Richard P. Hsung
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Aleksey V. Kurdyumov
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Nadiya Sydorenko
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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29
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Sunazuka T, Handa M, Nagai K, Shirahata T, Harigaya Y, Otoguro K, Kuwajima I, Ōmura S. Absolute stereochemistries and total synthesis of (+)-arisugacins A and B, potent, orally bioactive and selective inhibitors of acetylcholinesterase. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.059] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Jung ME, Min SJ. Novel formation of a bridged bicyclic furan by rearrangement of a tetrahydroxydecalinone. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.07.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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31
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Kurdyumov AV, Hsung RP, Ihlen K, Wang J. Formal [3 + 3] Cycloaddition Approach to Chromenes and Chromanes. Concise Total Syntheses of (±)-Rhododaurichromanic Acids A and B and Methyl (±)-Daurichromenic Ester. Org Lett 2003; 5:3935-8. [PMID: 14535747 DOI: 10.1021/ol030100k] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Total syntheses of (+/-)-rhododaurichromanic acids A and B and methyl (+/-)-daurichromenic ester are described here. Despite the complex appearances of these compounds, their syntheses are completed in six steps with a 15% overall yield as a mixture by featuring our formal oxa-[3 + 3] cycloaddition methodology.
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Affiliation(s)
- Aleksey V Kurdyumov
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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