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Cui Y, Lv J, Song T, Ren J, Wang Z. Highly efficient construction of an oxa-[3.2.1]octane-embedded 5-7-6 tricyclic carbon skeleton and ring-opening of the bridged ring via C-O bond cleavage. RSC Adv 2022; 12:9519-9523. [PMID: 35424922 PMCID: PMC8985103 DOI: 10.1039/d2ra01315k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 03/21/2022] [Indexed: 12/03/2022] Open
Abstract
We report herein a highly efficient strategy for construction of a bridged oxa-[3.2.1]octane-embedded 5–7–6 tricyclic carbon skeleton through [3 + 2] IMCC (intramolecular [3 + 2] cross-cycloaddition), and the substituents and/or stereochemistries on C-4, C-6, C-7 and C-10 fully match those in the rhamnofolane, tigliane and daphnane diterpenoids. Furthermore, ring-opening of the bridged oxa-[3.2.1]octane via C–O bond cleavage was also successfully achieved. We reported a highly efficient construction of an oxa-[3.2.1]octane-embedded 5–7–6 tricyclic carbon skeleton with a full match of the substituents and stereochemistries on C-4/-6/-7/-10 with those in the rhamnofolane/tigliane/daphnane diterpenoids.![]()
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Affiliation(s)
- Yi Cui
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 PR China
| | - Jiayuan Lv
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 PR China
| | - Tianhang Song
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 PR China
| | - Jun Ren
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 PR China
| | - Zhongwen Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 PR China
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2
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Tibhe GD, Macías MA, Schapiro V, Suescun L, Pandolfi E. General Method for the Synthesis of (-)-Conduritol C and Analogs from Chiral Cyclohexadienediol Scaffolds. MOLECULES (BASEL, SWITZERLAND) 2018; 23:molecules23071653. [PMID: 29986401 PMCID: PMC6100410 DOI: 10.3390/molecules23071653] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 06/29/2018] [Accepted: 07/01/2018] [Indexed: 11/16/2022]
Abstract
An efficient and facile general method for the synthesis of conduritol C analogs, taking advantage of an enantioselective biocatalysis process of monosubstituted benzenes, is described. The absolute stereochemical patterns of the target molecules (−)-conduritol C, (−)-bromo-conduritol C, and (−)-methyl-conduritol C were achieved by means of chemoenzymatic methods. The stereochemistry present at the homochiral cyclohexadiene-cis-1,2-diols derived from the arene biotransformation and the enantioselective ring opening of a non-isolated vinylepoxide derivative permitted the absolute configuration of the carbon bearing the hydroxyl groups at the target molecules to be established. All three conduritols and two intermediates were crystallized, and their structures were confirmed by X-ray diffraction. The three conduritols and intermediates were isostructural. The versatility of our methodology is noteworthy to expand the preparation of conduritol C analogs starting from toluene dioxygenase (TDO) monosubstituted arene substrates.
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Affiliation(s)
- Gaurao D Tibhe
- Laboratorio de Síntesis Orgánica, Departamento de Química Orgánica, Facultad de Química, Av. Gral. Flores 2124, Universidad de la República, Montevideo CP11800, Uruguay.
| | - Mario A Macías
- Cryssmat-Lab/DETEMA, Facultad de Química, Av. Gral. Flores 2124, Universidad de la República, Montevideo CP11800, Uruguay.
- Department of Chemistry, Universidad de los Andes, Carrera 1 N8 18 A-12, Bogotá 111711, Colombia.
| | - Valeria Schapiro
- Laboratorio de Síntesis Orgánica, Departamento de Química Orgánica, Facultad de Química, Av. Gral. Flores 2124, Universidad de la República, Montevideo CP11800, Uruguay.
| | - Leopoldo Suescun
- Cryssmat-Lab/DETEMA, Facultad de Química, Av. Gral. Flores 2124, Universidad de la República, Montevideo CP11800, Uruguay.
| | - Enrique Pandolfi
- Laboratorio de Síntesis Orgánica, Departamento de Química Orgánica, Facultad de Química, Av. Gral. Flores 2124, Universidad de la República, Montevideo CP11800, Uruguay.
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Hudlicky T, Rulin F, Tsunoda T, Luna H, Andersen C, Price JD. Biocatalysis as a Rational Approach to Enantiodivergent Synthesis of Highly Oxygenated Compounds: (+)- and (-)-Pinitol and Other Cyclitols. Isr J Chem 2013. [DOI: 10.1002/ijch.199100027] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Padwa A, Flick AC. Intramolecular Diels–Alder Cycloaddition of Furans (IMDAF) for Natural Product Synthesis. ADVANCES IN HETEROCYCLIC CHEMISTRY 2013. [DOI: 10.1016/b978-0-12-408100-0.00001-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Fraser CJ, Howell GP, Harrity JPA. A furan Diels–Alder cycloaddition approach to scyphostatin analogues. Org Biomol Chem 2012; 10:9058-66. [DOI: 10.1039/c2ob26793d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Duchek J, Adams DR, Hudlicky T. Chemoenzymatic Synthesis of Inositols, Conduritols, and Cyclitol Analogues. Chem Rev 2011; 111:4223-58. [DOI: 10.1021/cr1004138] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan Duchek
- Department of Chemistry and the Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines ON L2S 3A1, Canada
| | - David R. Adams
- Department of Chemistry and the Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines ON L2S 3A1, Canada
| | - Tomas Hudlicky
- Department of Chemistry and the Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines ON L2S 3A1, Canada
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Martel F, Estrine B, Plantier-Royon R, Hoffmann N, Portella C. Development of Agriculture Left-Overs: Fine Organic Chemicals from Wheat Hemicellulose-Derived Pentoses. Top Curr Chem (Cham) 2010; 294:79-115. [DOI: 10.1007/128_2010_54] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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10
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Bellomo A, Bertucci A, Stefani H, Vázquez Á, Gonzalez D. Novel deoxy-selenylconduritols: chemoenzymatic synthesis and biological evaluation. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Schindler C, Diethelm S, Carreira E. Nucleophilic Opening of Oxabicyclic Ring Systems. Angew Chem Int Ed Engl 2009; 48:6296-9. [DOI: 10.1002/anie.200902046] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Schindler C, Diethelm S, Carreira E. Nucleophilic Opening of Oxabicyclic Ring Systems. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Padwa A, Wang Q. Rhodium(I)-catalyzed nucleophilic ring-opening reactions of oxabicyclo adducts derived from the [4 + 2]-cycloaddition of 2-imido-substituted furans. J Org Chem 2007; 71:3210-20. [PMID: 16599620 PMCID: PMC2495029 DOI: 10.1021/jo060238r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of 2-imido-substituted furans containing tethered unsaturation were prepared by the addition of the lithium carbamate of furan-2-ylcarbamic acid tert-butyl ester to a solution of the mixed anhydride of an appropriately substituted 3-butenoic acid. The initially formed imido furans undergo a rapid intramolecular [4 + 2]-cycloaddition at room temperature to deliver the Diels-Alder cycloadducts in good to excellent yield. Isolation of the highly labile oxabicyclic adduct is believed to be a consequence of the lower reaction temperatures employed as well as the presence of the extra carbonyl group, which diminishes the basicity of the nitrogen atom, thereby retarding the ring cleavage/rearrangement reaction generally encountered with related systems. By using a Rh(I)-catalyzed ring opening of the oxabicyclic adduct with various nucleophilic reagents, it was possible to prepare highly functionalized hexahydro-1H-indol-2(3H)-one derivatives in good yield. The major stereoisomer obtained possesses a cis-relationship between the nucleophile and hydroxyl group in the ring-opened product. The stereochemistry was unequivocally established by X-ray crystallographic analysis. Coordination of Rh(I) to the alkenyl pi-bond followed by a nitrogen-assisted cleavage of the carbon-oxygen bond occurs to furnish a pi-allyl rhodium(III) species. Addition of the nucleophile then occurs from the least hindered terminus of the resulting pi-allyl rhodium(III) complex. Proton exchange followed by rhodium(I) decomplexation ultimately leads to the cis-diastereomer.
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Uebelhart P, Weymuth C, Linden A, Hansen HJ. Benzo[a]heptalenes from Heptaleno[1,2-c]furans. Part 2. Helv Chim Acta 2007. [DOI: 10.1002/hlca.200790069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Lang M, Ziegler T. Synthesis of Both Enantiomers of Conduritol C Tetraacetate and ofmeso-Conduritol D Tetraacetate by Oxidation of Benzoquinone Bis(ethylene acetal). European J Org Chem 2007. [DOI: 10.1002/ejoc.200600764] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Josien-Lefebvre D, Le Drian C. Total Synthesis of (2Z)-[(4R,5R,6S)-6-(β-D-Glucopyranosyloxy)-4,5-dihydroxycyclohex-2-en-1-ylidene]ethanenitrile, a Cyanoglucoside fromIlex warburgii. Helv Chim Acta 2007. [DOI: 10.1002/hlca.200790015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Padwa A, Crawford KR, Straub CS, Pieniazek SN, Houk KN. Halo Substituent Effects on Intramolecular Cycloadditions Involving Furanyl Amides. J Org Chem 2006; 71:5432-9. [PMID: 16839120 DOI: 10.1021/jo0602322] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular Diels-Alder reactions involving a series of N-alkenyl-substituted furanyl amides were investigated. Stable functionalized oxanorbornenes were formed in high yield upon heating at 80-110 degrees C. The cycloaddition reactions include several bromo-substituted furanyl amides, and these systems were found to proceed at a much faster rate and in higher yield than without substitution. This effect was observed by incorporating a halogen in the 3- or 5-position of the furan ring and appears to be general. The origin of increased cycloaddition rates for halo-substituted furans has been investigated with quantum mechanical calculations. The success of these reactions is attributed to increases in reaction exothermicities; this both decreases activation enthalpies and increases barriers to retrocycloadditions. Halogen substitution on furan increases reactant energy and stabilizes the product, which is attributed to the preference of electronegative halogens to be attached to a more highly alkylated and therefore more electropositive framework.
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Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
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Namboothiri INN, Ganesh M, Mobin SM, Cojocaru M. A Stereoselective and Atom-Efficient Approach to Multifunctionalized Five- and Six-Membered Rings via a Novel Michael-Initiated Intramolecular Diels−Alder Furan Reaction. J Org Chem 2005; 70:2235-43. [PMID: 15760210 DOI: 10.1021/jo048262x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A variety of key precursors to the intramolecular Diels-Alder reaction of furan diene (IMDAF) have been prepared via a very facile 1,4-addition of O-, S-, N-, and C-centered nucleophiles possessing unsaturated tether to beta-furyl nitroethylene. Subsequent IMDAF reaction of the 1,4-adducts, carried out under thermal conditions, provided five- and six-membered carbocycles and heterocycles fused to an easily cleavable oxabicycloheptene moiety. The structure and stereochemistry of the cycloadducts were determined by 2D-NMR experiments and further confirmed by X-ray crystallography. The salient features of the strategy include high degree of stereoselectivity (>80:20) in the cycloaddition, atom and step economy, and generation of multiple chiral centers and functionalities. The feasibility of the cleavage of the oxa bridge in the cycloadducts to afford novel multifunctional molecules has also been demonstrated.
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Affiliation(s)
- Irishi N N Namboothiri
- Department of Chemistry and National Single-Crystal X-ray Diffraction Facility, Indian Institute of Technology, Bombay, Mumbai 400 076, India.
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Abstract
A short synthetic strategy for preparation of the conduritols is described. The key step employs a zinc-mediated fragmentation of protected methyl 5-deoxy-5-iodo-d-pentofuranosides followed by an allylation of the intermediate aldehyde in the same pot. The allylation is performed with 3-bromopropenyl benzoate and occurs with good diastereoselectivity. An amino group can be introduced in the product by trapping the intermediate aldehyde as the imine prior to the allylation. The functionalised 1,7-octadienes, thus obtained, are converted into protected conduritols by ring-closing olefin metathesis.
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Affiliation(s)
- Lise Keinicke
- Center for Sustainable and Green Chemistry, Department of Chemistry, Building 201, Technical University of Denmark, DK-2800, Lyngby, Denmark
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20
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Baran A, Kazaz C, Seçen H, Sütbeyaz Y. Synthesis of haloconduritols from an endo-cycloadduct of furan and vinylene carbonate. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00510-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Padwa A, Crawford KR, Rashatasakhon P, Rose M. Several convenient methods for the synthesis of 2-amido substituted furans. J Org Chem 2003; 68:2609-17. [PMID: 12662029 DOI: 10.1021/jo026757l] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Several new methods for the synthesis of differently substituted 2-amidofurans are described. The thermolysis of furan-2-carbonyl azide results in a Curtius rearrangement and the resulting furanyl isocyanate was trapped with various organometallic reagents. A second method consists of a C-N cross-coupling reaction of a bromo-substituted furan with various amides, carbamates, and lactams. The CuI-catalyzed cross-coupling reaction between furanyl bromides and amides furnished 2- and 3-substituted amidofurans in 45-95% yield. The third protocol used involves the reaction of cyclic carbinol amides with triflic anhydride. The reaction proceeds under very mild conditions to provide alpha-(trifluoromethyl)sulfonamido-substituted furans in high yield. The resulting iminium ion derived from the reaction of the hydroxy pyrrolidinone with Tf(2)O undergoes a facile ring opening as a consequence of the adjacent hydroxyl group to produce an imino triflate intermediate. Subsequent cyclization of this highly electrophilic imine with the oxygen atom of the adjacent carbonyl group leads to an imino dihydrofuran that reacts further with another equivalent of Tf(2)O to give the observed product.
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Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
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Padwa A, Ginn JD, Bur SK, Eidell CK, Lynch SM. Synthesis of azapolycyclic systems via the intramolecular [4 + 2] cycloaddition chemistry of 2-(alkylthio)-5-amidofurans. J Org Chem 2002; 67:3412-24. [PMID: 12003554 DOI: 10.1021/jo0111816] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of 2-(methylthio)-5-amidofurans containing tethered unsaturation were prepared via the reaction of dimethyl(methylthio)sulfonium tetrafluoroborate (DMTSF) with beta-alkoxy-gamma-dithiane amides 13-16 and 27-32 in 40-70% yield. Thermolysis of these furans resulted in an intramolecular Diels-Alder reaction (IMDAF). With the exception of 45 and 46, the oxa-bridged cycloadducts could not be isolated but immediately underwent a 1,2-methylthio shift to form bicyclic lactams in 60-100% yield. It was determined that incorporation of the amido carbonyl in the tether allowed the IMDAF reaction to proceed at a lower temperature. A dramatic example of this is seen in the IMDAF reaction of furan 35, in which the presence of an amido carbonyl as part of the dienophile tether, as opposed to the annealed ring (66) or the lack of a carbonyl (67), was necessary for the cycloaddition to occur. Furan 37, annealed to an azepine ring, underwent the IMDAF reaction at or below room temperature. To identify structural features that promote the IMDAF reaction, a computational study was undertaken. Ground-state and transition-state energies were calculated for furans 17, 33, 37, and 64 using the Becke 3LYP/6-31G model. The theoretical results were in good agreement with those observed. The results indicate that the incorporation of an amide carbonyl as part of the tether system works to place the dienophile in closer proximity to the furan ring, thereby lowering the activation energy needed to reach the transition state.
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Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
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Kwon YU, Lee C, Chung SK. Facile syntheses of all possible diastereomers of conduritol and various derivatives of inositol stereoisomers in high enantiopurity from myo-inositol. J Org Chem 2002; 67:3327-38. [PMID: 12003543 DOI: 10.1021/jo016237a] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phosphoinositide-based signaling processes are crucially important in intracellular signal transduction events. Inositol phosphate analogues have been useful in probing the structure-activity relationships between inositol phosphates and biomacromolecules, and in studying biological functions of newly found inositol phosphates. Thus, a systematic and ready access to inositol stereoisomers is highly desirable. And practical and convenient syntheses of conduritols and related compounds are also important because of their biological activities and their synthetic utilities in the preparation of other bioactive molecules. We herein report the first syntheses of all possible diastereomers of conduritol and various derivatives of eight inositol stereoisomers in high enantiopurity from myo-inositol, which involve efficient enzymatic resolution of the intermediates conduritol B and C derivatives, followed by oxidation-reduction or the Mitsunobu reaction, and cis-dihydroxylation in stereo- and regioselective manners.
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Affiliation(s)
- Yong-Uk Kwon
- Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science & Technology, Pohang 790-784, South Korea
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Kwon YU, Chung SK. Facile synthetic routes to all possible enantiomeric pairs of conduritol stereoisomers via efficient enzymatic resolution of conduritol B and C derivatives. Org Lett 2001; 3:3013-6. [PMID: 11554831 DOI: 10.1021/ol0164233] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first synthesis of all possible enantiomeric pairs of conduritol stereoisomers has been accomplished by efficient enzymatic resolution of conduritol B and C derivatives, followed by oxidation/reduction and the Mitsunobu reaction in stereo- and regioselective manners. Reaction: see text.
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Affiliation(s)
- Y U Kwon
- Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang 790-784, South Korea
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Hyldtoft L, Madsen R. Carbohydrate Carbocyclization by a Novel Zinc-Mediated Domino Reaction and Ring-Closing Olefin Metathesis. J Am Chem Soc 2000. [DOI: 10.1021/ja001415n] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lene Hyldtoft
- Contribution from the Department of Organic Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Robert Madsen
- Contribution from the Department of Organic Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
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Padwa A, Reger TS. Construction of bicyclic tetrahydroisoquinolinones by combination of an IMDAF-ring cleavage reaction of N-allyl-2-furan-2-yl-acetamides. CAN J CHEM 2000. [DOI: 10.1139/v99-234] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The intramolecular Diels-Alder reaction of furanyl amides derived from 2-furylacetic acid has been examined. Substrates containing either an imide or tertiary amide linkage between the furan and the dienophile underwent smooth cycloaddition upon thermolysis. By varying the reaction conditions, either the primary cycloadduct or the ring-opened and acetylated product could be isolated in excellent yield. The stereochemical outcome of the IMDAF cycloaddition has the side arm of the tethered alkenyl group oriented syn with respect to the oxygen bridge. Semi-empirical AM1 calculations show that the exo-cycloadduct is 11 kcal lower in energy than the corresponding endo adduct and, presumably, some of this energy difference is reflected in the transition state for the cycloaddition. The IMDAF reaction of N-allyl-[2-(3,4-dimethoxyphenethyl)]-2-furanyl-2-yl-acetamide proceeded in 90% yield upon heating in xylene. The 4+2-cycloadduct undergoes ring-opening on treatment with base and the resulting alcohol was converted into the corresponding benzyl ether. Raney nickel reduction followed by Bischler-Napieralski cyclization furnished the tetracyclic skeleton of the berberine alkaloids.Key words: intramolecular, cycloaddition, Diels-Alder, furanylamide, heterocycle.
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Vogel P, Cossy J, Plumet J, Arjona O. Derivatives of 7-oxabicyclo[2.2.1]heptane in nature and as useful synthetic intermediates. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00845-5] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Padwa A, Brodney MA, Satake K, Straub CS. Cycloaddition-Rearrangement Sequence of 2-Amido Substituted Furans as a Method of Synthesizing Hexahydroindolinones. J Org Chem 1999; 64:4617-4626. [PMID: 11674531 DOI: 10.1021/jo982061+] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convenient synthesis of various substituted hexahydroindolinones has been achieved by an intramolecular Diels-Alder cycloaddition (IMDAF) reaction of 2-amido substituted furans. The initially formed [4 + 2] cycloadduct undergoes nitrogen-assisted ring opening followed by deprotonation of the resulting zwitterion to give the rearranged ketone. The stereochemical outcome of the IMDAF cycloaddition has the sidearm of the tethered alkenyl group oriented syn with respect to the oxygen bridge. The reaction rate and product yield were found to be markedly dependent upon the electronic properties of the alkenyl pi-bond. 2-[2-(tert-Butoxycarbonylfuran-2-yl-amino)ethyl]acrylic acid methyl ester was synthesized from 3-chlorocarbonyl-but-3-enoic acid methyl ester. Thermolysis of the carbomethoxy activated furanamide occurred at 80 degrees C to produce a rearranged hexahydroindolinone. When Me(3)Al or (MeO)(3)Al was used as a Lewis acid to promote the cycloaddition, a rearranged alcohol was obtained. The initially formed [4 + 2] cycloadduct undergoes ring opening in the presence of the Lewis acid, and the resulting aluminum intermediate delivers the substituent group from the same face as the neighboring oxygen to ultimately furnish a rearranged cis-alcohol. In contrast to this result, a mixture of diastereomeric methoxy alcohols was isolated when the IMDAF cycloaddition was carried out in methanol. The major isomer corresponds to the trans-diastereomer that results from trapping of the iminium ion from the less crowded face of the pi-bond.
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Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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Yoshizaki H, Bäckvall JE. Efficient Synthesis of (±)-, (+)-, and (−)-Conduritol C via Palladium(II)-Catalyzed 1,4-Diacetoxylation in Combination with Enzymatic Hydrolysis. J Org Chem 1998. [DOI: 10.1021/jo981281k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroki Yoshizaki
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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Beusker PH, M. Aben RW, Seerden JPG, Smits JMM, Scheeren HW. Exploration of High-Pressure Cycloadducts of Furans and Citraconic Anhydride as Precursors for CD-Ring Fragments of Paclitaxel and Its Analogues. European J Org Chem 1998. [DOI: 10.1002/(sici)1099-0690(199811)1998:11<2483::aid-ejoc2483>3.0.co;2-m] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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31
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Padwa A, Dimitroff M, Waterson AG, Wu T. IMDAF Cycloaddition as a Method for the Preparation of Pyrrolophenanthridine Alkaloids. J Org Chem 1998. [DOI: 10.1021/jo980008f] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Martin Dimitroff
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Alex G. Waterson
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Tianhua Wu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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Padwa A, Dimitroff M, Waterson AG, Wu T. Diels−Alder Reaction of 2-Amino-Substituted Furans as a Method for Preparing Substituted Anilines. J Org Chem 1997. [DOI: 10.1021/jo9702599] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Martin Dimitroff
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Alex G. Waterson
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Tianhua Wu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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Padwa A, Kappe CO, Cochran JE, Snyder JP. Studies Dealing with the Cycloaddition/Ring Opening/Elimination Sequence of 2-Amino-Substituted Isobenzofurans. J Org Chem 1997; 62:2786-2797. [PMID: 11671641 DOI: 10.1021/jo962358c] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The alpha-thiocarbocation generated from the Pummerer reaction of an o-amido-substituted sulfoxide is intercepted by the adjacent amido carbonyl group to produce a 2-amino-substituted isobenzofuran as a transient intermediate. In the presence of an electron-deficient dienophile, the reactive isobenzofuran undergoes a Diels-Alder cycloaddition followed by ring opening to furnish a vinylogous C-acyliminium ion that readily aromatizes. The one-pot intramolecular cascade process only occurs either if the olefinic tether is activated by an ester or if a carbonyl group is located adjacent to the nitrogen atom of the 2-amino-substituted isobenzofuran. To examine the amine vs amide influence on the course of intramolecular cycloaddition, density functional theory (DFT) calculations have been carried out for both ground and transition states. The results strongly suggest that the amide-substituted isobenzofurans are destabilized by steric effects between the aromatic ring and the nitrogen-containing side chain. Raising of the ground-state amide energies thereby reduces the activation energy for internal cycloaddition and leads to Diels-Alder adducts more rapidly than for the corresponding amines. Amide tethers emerge as remote-site promoters of intramolecular cycloaddition for tandem processes yielding products with multiple fused rings.
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Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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34
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Chiu P, Lautens M. Using ring-opening reactions of oxabicyclic compounds as a strategy in organic synthesis. Top Curr Chem (Cham) 1997. [DOI: 10.1007/bfb0119245] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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35
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Patti A, Sanfilippo C, Piattelli M, Nicolosi G. Enantioselective Synthesis of (-)- and (+)-Conduritol F via Enzymatic Asymmetrization of cis-Cyclohexa-3,5-diene-1,2-diol. J Org Chem 1996; 61:6458-6461. [PMID: 11667496 DOI: 10.1021/jo960251j] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Angela Patti
- Istituto CNR per lo Studio delle Sostanze Naturali di Interesse Alimentare e Chimico-Farmaceutico, Via del Santuario 110, 95028 Valverde CT, Italy
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Enzymatic desymmetrisation of conduritol D. preparation of homochiral intermediates for the synthesis of cyclitols and aminocyclitols. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00342-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Ancerewicz J, Vogel P, Schenk K. TheDiels-Alder Reactivity of 2,2?-Ethylidenebis[3,5-dimethylfuran] and Exploratory Chemistry of the Mono-adducts. Helv Chim Acta 1996. [DOI: 10.1002/hlca.19960790514] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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38
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Marchionni C, Vogel P, Roversi P. The simultaneous double Diels-Alder addition of 1,1-bis(3,5-dimethylfur-2-yl)ethane; toward a new, asymmetric synthesis of long-chain polypropionate fragments and analogues. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)00771-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hudlicky T, Entwistle DA, Pitzer KK, Thorpe AJ. Modern Methods of Monosaccharide Synthesis from Non-Carbohydrate Sources. Chem Rev 1996; 96:1195-1220. [PMID: 11848785 DOI: 10.1021/cr9403300] [Citation(s) in RCA: 200] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomas Hudlicky
- Department of Chemistry, University of Florida, Gainesville, Florida 32611
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Arjona O, de Dios A, Montero C, Plumet J. Synthesis of optically pure, differentially protected 1,4- and 1,6-mannosyl-D-myo-inositol derivatives from 7-oxabicyclo[2.2.1]heptan-2-one. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00524-c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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41
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Allemann S, Vogel P. Enantioselective synthesis of (?)-conduramine C1 and aminobromocyclitol derivatives. Helv Chim Acta 1994. [DOI: 10.1002/hlca.19940770103] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mereyala HB, Gaddam BR. Synthesis of conduritols A, (+)-C and (–)-C fromD-galactose. ACTA ACUST UNITED AC 1994. [DOI: 10.1039/p19940002187] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Akiyama T, Shima H, Ohnari M, Okazaki T, Ozaki S. Synthesis of (−)-Conduritol F, (+)-Conduritol B, Cyclophellitol from L-Quebrachitol. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1993. [DOI: 10.1246/bcsj.66.3760] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Arjona O, de Dios A, Plumet J. Regio- and stereocontrolled alkylative ring opening of unsymmetrical 8-oxabicyclo[3.2.1]octene systems. Synthesis of highly substituted hydroxycycloheptenyl sulfones. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60150-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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45
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Kernen P, Vogel P. The Homoconjugated Electron-Releasing Carbonyl Group of 1-Methylbicyclo[2.2.1]hept-5-en-2-one. Regioselective syntheses of 5-chloro- and 6-chloro-1-methylbicyclo[2.2.1]hept-5-en-2-one. Helv Chim Acta 1993. [DOI: 10.1002/hlca.19930760619] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Carless HA. Complementary enantiospecific syntheses of conduritol E epoxides from halobenzenes. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)60978-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Seçen H, Maraş A, Sütbeyaz Y, Balci M. A Novel Synthesis of Conduritol-C and Conduritol-E via p-Benzoquinone. SYNTHETIC COMMUN 1992. [DOI: 10.1080/00397919208021660] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Tschamber T, Backenstrass F, Fritz H, Streith J. Catalytic One-Pot Osmylation of Cyclohexadienes: Stereochemical and conformational studies of the resulting polyols. Helv Chim Acta 1992. [DOI: 10.1002/hlca.19920750408] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Carless HAJ. Enantiospecific and stereoselective synthesis of (–)-conduritol C from chlorobenzene via microbial oxidation and epoxidation. ACTA ACUST UNITED AC 1992. [DOI: 10.1039/c39920000234] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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