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Kotani S, Kai K, Sugiura M, Nakajima M. Sequential Catalysis of Phosphine Oxide for Stereoselective Synthesis of Stereopentads. Org Lett 2017. [PMID: 28636385 DOI: 10.1021/acs.orglett.7b01719] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient method for accessing enantiomerically pure stereopentads via a catalytic asymmetric sequential aldol reaction has been developed for the first time. The enantioselective sequential aldol reaction produces a wide range of chiral stereopentad precursors in good yields with excellent enantioselectivities. The key to success is the use of the sequential catalytic system involving a chiral phosphine oxide catalyst and trichlorosilyl triflate.
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Affiliation(s)
- Shunsuke Kotani
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.,Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Kosuke Kai
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Masaharu Sugiura
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Makoto Nakajima
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
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2
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Goswami D, Koli MR, Chatterjee S, Chattopadhyay S, Sharma A. syn-Selective crotylation of aldehydes using bismuth-crotyl bromide-(1-butyl-3-methylimidazolium bromide) combination: some synthetic applications. Org Biomol Chem 2017; 15:3756-3774. [PMID: 28406519 DOI: 10.1039/c7ob00626h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Bi-[bmim][Br] combination has been found to offer high syn-selectivity in the crotylation of aldehydes with crotyl bromide using practically stoichiometric amounts of the reagents. The room temperature ionic liquid (RTIL), [bmim][Br], activated Bi metal in the presence of oxygen to produce crotylbismuthdibromide, which reacted with the aldehydes at room temperature. The major anti-syn diastereomeric product obtained from the crotylation of (R)-cyclohexylideneglyceraldehyde was utilized for the synthesis of dictyostatin and cryptophycin segments, and (+)-cis-aerangis lactone, using standard synthetic protocols.
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Affiliation(s)
- Dibakar Goswami
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
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3
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4
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Yadav JS, Gyanchander E, Das S. Application of oxetane ring opening toward stereoselective synthesis of zincophorin fragment. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.020] [Citation(s) in RCA: 10] [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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5
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Chen M, Roush WR. Reprint of: Enantiodivergent hydroboration reactions of a racemic allenylsilane with diisopinocampheylborane and Curtin–Hammett controlled double asymmetric crotylboration reactions of (S)-E-α-phenyldimethylsilyl(ddiisopinocampheyl)-crotylborane. Tetrahedron 2013; 69:7551-7558. [DOI: 10.1016/j.tet.2013.06.053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Cooksey JP. Synthesis of a C1-C11 fragment of Zincophorin using planar chiral, neutral π-allyl iron complexes. Org Biomol Chem 2013; 11:5117-26. [PMID: 23812275 DOI: 10.1039/c3ob40894a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A key step in the synthesis of a C1-C11 fragment of the ionophore antibiotic Zincophorin involves the addition of an α-alkoxyalkylcopper(I) reagent to a planar chiral, neutral π-allyl iron complex. The key allylic alkylation reaction is highly regio- and stereoselective with addition taking place at the γ-position anti to the metal centre.
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Affiliation(s)
- John P Cooksey
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.
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7
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Chen M, Roush WR. Enantiodivergent Hydroboration Reactions of a Racemic Allenylsilane with Diisopinocampheylborane and Curtin-Hammett Controlled Double Asymmetric Crotylboration Reactions of ( S)- E-α-phenyldimethylsilyl( d diisopinocampheyl)-crotylborane. Tetrahedron 2013; 69:5468-5475. [PMID: 24039304 DOI: 10.1016/j.tet.2013.04.098] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The enantiodivergent hydroboration reactions of racemic allenylsilane (±)-4 with ( d Ipc)2BH and subsequent crotylboration of achiral aldehydes with the product crotylborane (S)-E-5 at -78 °C provide (E)-δ-silyl-anti-homoallylic alcohols 6 in 71-89% yield and with 93-96% ee. Intriguingly, mismatched double asymmetric crotylboration reactions of enantioenriched chiral aldehydes 20 with (S)-E-5 proceed under Curtin-Hammett control to give anti-3-hydroxylcrotylsilanes 24 as the only products.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, The Scripps Research Institute, Florida, 130 Scripps Way, Jupiter, FL 33458, USA
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8
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Malkov AV, Stončius S, Bell M, Castelluzzo F, Ramírez-López P, Biedermannová L, Langer V, Rulíšek L, Kočovský P. Mechanistic Dichotomy in the Asymmetric Allylation of Aldehydes with Allyltrichlorosilanes Catalyzed by Chiral Pyridine N
-Oxides. Chemistry 2013; 19:9167-85. [DOI: 10.1002/chem.201203817] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Indexed: 11/11/2022]
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9
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Tsai AS, Chen M, Roush WR. Chiral Brønsted acid catalyzed enantioselective synthesis of anti-homopropargyl alcohols via kinetic resolution-aldehyde allenylboration using racemic allenylboronates. Org Lett 2013; 15:1568-71. [PMID: 23484801 PMCID: PMC3640598 DOI: 10.1021/ol4003459] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A chiral phosphoric acid catalyzed kinetic resolution/allenylboration of racemic allenylboronates with aldehydes is described. Allenylboration of aldehydes with 2.8 equiv of allenylboronate (±)-1 in the presence of 10 mol % of catalyst (R)-2 provided anti-homopropargyl alcohols 3 in 83-95% yield with 9:1 to 20:1 diastereoselectivity and 73-95% ee. The catalyst enables the kinetic resolution of the racemic allenylboronate (±)-1 to set the methyl stereocenter and biases the facial attack of the aldehyde to set the stereochemistry of the hydroxyl group in 3.
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Affiliation(s)
- Andy S. Tsai
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, United States
| | - Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, United States
| | - William R. Roush
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, United States
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11
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Chen M, Roush WR. Enantioselective synthesis of anti- and syn-homopropargyl alcohols via chiral Brønsted acid catalyzed asymmetric allenylboration reactions. J Am Chem Soc 2012; 134:10947-52. [PMID: 22731887 PMCID: PMC3474359 DOI: 10.1021/ja3031467] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Chiral Brønsted acid catalyzed asymmetric allenylboration reactions are described. Under optimized conditions, anti-homopropargyl alcohols 2 are obtained in high yields with excellent diastereo- and enantioselectivities from stereochemically matched aldehyde allenylboration reactions with (M)-1 catalyzed by the chiral phosphoric acid (S)-4. The syn-isomers 3 can also be obtained in good diastereoselectivities and excellent enantioselectivities from the mismatched allenylboration reactions of aromatic aldehydes using (M)-1 in the presence of the enantiomeric phosphoric acid (R)-4. The stereochemistry of the methyl group introduced into 2 and 3 is controlled by the chirality of the allenylboronate (M)-1, whereas the configuration of the new hydroxyl stereocenter is controlled by the enantioselectivity of the chiral phosphoric acid catalyst used in these reactions. The synthetic utility of this methodology was further demonstrated in highly diastereoselective syntheses of a variety of anti, anti-stereotriads, the direct synthesis of which has constituted a significant challenge using previous generations of aldol and crotylmetal reagents.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
| | - William R. Roush
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
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12
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Schwarz D, Brendler E, Kroke E, Wagler J. Pentacoordinate Silicon Complexes withN-(2-pyridylmethyl)salicylamide as a Dianionic (ONN′) Tridentate Chelator. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200084] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Chen M, Roush WR. Highly stereoselective synthesis of anti,anti-dipropionate stereotriads: a solution to the long-standing problem of challenging mismatched double asymmetric crotylboration reactions. J Am Chem Soc 2012; 134:3925-31. [PMID: 22332989 DOI: 10.1021/ja300472a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereocontrolled synthesis of the β-branched anti,anti-dipropionate stereotriad 4 via aldol or crotylmetal chemistry represents a historical challenge to the organic synthesis community. Here we describe a general solution to the long-standing problem associated with the synthesis of 4 by utilizing mismatched double asymmetric crotylboration reactions of enantioenriched α-methyl substituted aldehydes with the chiral, nonracemic crotylborane reagent (S)-(E)-22 (or its enantiomer). This method not only provides direct access to anti,anti-dipropionate stereotriads 24 [a synthetic equivalent of 4] with very good (5-8:1) if not excellent (≥15:1) diastereoselectivity from β-branched chiral aldehydes with ≤50:1 intrinsic diastereofacial selectivity preferences but also provides a vinylstannane unit in the products that is properly functionalized for use in subsequent C-C bond-forming events. We anticipate that this method will be widely applicable and will lead to substantial simplification of strategies for synthesis of polyketide natural products.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
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14
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Hudrlik PF, Hudrlik AM, Jeilani YA. Intramolecular nucleophilic attack at silicon in o-silylbenzyl alcohols. Generation of allyl and benzyl anion equivalents. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.127] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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15
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Ying M, Roush WR. Studies on the Synthesis of Reidispongiolide A: Stereoselective Synthesis of the C(22)-C(36) Fragment. Tetrahedron 2011; 67:10274-10280. [PMID: 22711935 DOI: 10.1016/j.tet.2011.10.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A highly stereoselective synthesis of the C(22)-C(36) fragment 2 of reidispongiolide A is described. This synthesis features the highly stereoselective mismatched double asymmetric crotylboration reaction of the aldehyde derived from 5 and the new chiral reagent (S)-(E)-7 that provides 12 with >15:1 d.r. Subsequent coupling of the derived vinyl iodide 3 with aldehyde 16 provided allylic alcohol 17, that was elaborated by three steps into the targeted reidispongiolide fragment 2.
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Affiliation(s)
- Maben Ying
- Department of Chemistry, The Scripps Research Institute, Florida, 130 Scripps Way, Jupiter, FL 33458, USA
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16
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Mochirian P, Godin F, Katsoulis I, Fontaine I, Brazeau JF, Guindon Y. A Bidirectional Approach to the Synthesis of Polypropionates: Synthesis of C1–C13 Fragment of Zincophorin and Related Isomers. J Org Chem 2011; 76:7654-76. [DOI: 10.1021/jo2013884] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Philippe Mochirian
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - François Godin
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Ioannis Katsoulis
- NCSR “Demokritos”, Institute of Physical Chemistry, Agia Paraskevi, GR 15310, Greece
| | - Isabelle Fontaine
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Jean-François Brazeau
- Department of Chemistry, University of California, 619 Latimer Hall, Berkeley, California, 94720, United States
| | - Yvan Guindon
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada, H3A 2K6
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17
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Halvorsen GT, Roush WR. Stereoselective Synthesis of the Decahydrofluorene Core of the Hirsutellones. Tetrahedron Lett 2011; 52:2072-2075. [PMID: 21503271 DOI: 10.1016/j.tetlet.2010.10.111] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
A stereoselective synthesis of the decahydrofluorene core of the hirsutellones was accomplished in 8 steps and in 43% overall yield. The key step of the synthesis is the highly stereoselective intramolecular Diels-Alder cyclization of the siloxacyclopentene constrained tetraene 1.
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Affiliation(s)
- Geoff T Halvorsen
- Department of Chemistry, Scripps Florida, 130 Scripps Way, Jupiter, FL 33458, USA
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18
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Chattopadhyay A, Goswami D, Dhotare B. Crotylation of (R)-2,3-O-cyclohexylideneglyceraldehyde: a simple synthesis of (+)-trans-oak lactone. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.05.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Fagerholm AE, Habrant D, Koskinen AMP. Calyculins and related marine natural products as serine-threonine protein phosphatase PP1 and PP2A inhibitors and total syntheses of calyculin A, B, and C. Mar Drugs 2010; 8:122-72. [PMID: 20161975 PMCID: PMC2817927 DOI: 10.3390/md80100122] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 01/12/2010] [Accepted: 01/13/2010] [Indexed: 11/22/2022] Open
Abstract
Calyculins, highly cytotoxic polyketides, originally isolated from the marine sponge Discodermia calyx by Fusetani and co-workers, belong to the lithistid sponges group. These molecules have become interesting targets for cell biologists and synthetic organic chemists. The serine/threonine protein phosphatases play an essential role in the cellular signalling, metabolism, and cell cycle control. Calyculins express potent protein phosphatase 1 and 2A inhibitory activity, and have therefore become valuable tools for cellular biologists studying intracellular processes and their control by reversible phosphorylation. Calyculins might also play an important role in the development of several diseases such as cancer, neurodegenerative diseases, and type 2-diabetes mellitus. The fascinating structures of calyculins have inspired various groups of synthetic organic chemists to develop total syntheses of the most abundant calyculins A and C. However, with fifteen chiral centres, a cyano-capped tetraene unit, a phosphate-bearing spiroketal, an anti, anti, anti dipropionate segment, an alpha-chiral oxazole, and a trihydroxylated gamma-amino acid, calyculins reach versatility that only few natural products can surpass, and truly challenge modern chemists' asymmetric synthesis skills.
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Affiliation(s)
- Annika E. Fagerholm
- Laboratory of Organic Chemistry, Helsinki University of Technology, PO Box 6100, FIN-02015 HUT, Finland; E-Mails:
(A.E.F.);
(D.H.)
| | - Damien Habrant
- Laboratory of Organic Chemistry, Helsinki University of Technology, PO Box 6100, FIN-02015 HUT, Finland; E-Mails:
(A.E.F.);
(D.H.)
| | - Ari M. P. Koskinen
- Laboratory of Organic Chemistry, Helsinki University of Technology, PO Box 6100, FIN-02015 HUT, Finland; E-Mails:
(A.E.F.);
(D.H.)
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20
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Habrant D, Koskinen AMP. Towards the total synthesis of calyculin C: preparation of the C9–C25 spiroketal-dipropionate unit. Org Biomol Chem 2010; 8:4364-73. [DOI: 10.1039/c0ob00092b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Fleury E, Lannou MI, Bistri O, Sautel F, Massiot G, Pancrazi A, Ardisson J. Advances in the Universal NMR Database: Toward the Determination of the Relative Configurations of Large Polypropionates. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900616] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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22
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Metal-dependent modulation of diastereoselectivity in the Barbier-type crotylation of (R)-cyclohexylideneglyceraldehyde. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.08.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Torres W, Rodríguez RR, Prieto JA. Stereoselective construction of all-anti polypropionate modules: synthesis of the C5-C10 fragment of streptovaricin U. J Org Chem 2009; 74:2447-51. [PMID: 19236033 DOI: 10.1021/jo8026966] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A concise nonaldol approach for the stereoselective construction of all-anti polypropionate fragments was developed. The iterative epoxide-based methodology consists of the syn-selective epoxidation of cis homoallylic alcohols with use of the VO(acac)(2)-catalyzed conditions followed by epoxide cleavage with a propynyl aluminum reagent as key steps. The methodology was applied to the synthesis of the all-anti C6-C10 fragment of streptovaricin U.
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Affiliation(s)
- Wildeliz Torres
- Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, P.O. Box 23346, San Juan, Puerto Rico
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25
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Song Z, Lohse AG, Hsung RP. Challenges in the synthesis of a unique mono-carboxylic acid antibiotic, (+)-zincophorin. Nat Prod Rep 2009; 26:560-71. [PMID: 19642422 PMCID: PMC2828946 DOI: 10.1039/b821450f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
(+)-Zincophorin, also referred to as M144255 or griseocholin, is a polyoxygenated ionophoric antibiotic that was isolated from Streptomyces griseus in 1984. It possesses strong in vivo activity against Gram-positive bacteria and Clostridium coelchii. Its methyl ester was reported in a patent as having strong inhibitory properties against influenza WSN/virus with reduced toxicity for the host cell. Its ability to strongly bind with Zn2+, which is also present in its X-ray structure, is the basis for its name. Over the last two decades, (+)-zincophorin has attracted an impressive array of synthetic efforts including Danishefsky's first total synthesis, along with two recent elegant total syntheses reported by Cossy and Miyashita as well as our own formal total synthesis. This review provides a comparison of the different synthetic efforts on this novel mono-carboxylic acid antibiotic and documents its interesting isolation, structure determination, and biological activities.
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Affiliation(s)
- Zhenlei Song
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Andrew G. Lohse
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705 USA
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705 USA
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Lippe K, Gerlach D, Kroke E, Wagler J. Hypercoordinate Organosilicon Complexes of an ONN′O′ Chelating Ligand: Regio- and Diastereoselectivity of Rearrangement Reactions in Si−Salphen Systems. Organometallics 2008. [DOI: 10.1021/om801049q] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katrin Lippe
- Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany
| | - Daniela Gerlach
- Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany
| | - Edwin Kroke
- Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany
| | - Jörg Wagler
- Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany
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27
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Brazeau JF, Mochirian P, Prévost M, Guindon Y. Stereopentads Derived from a Sequence of Mukaiyama Aldolization and Free Radical Reduction on α-Methyl-β-alkoxy Aldehydes: A General Strategy for Efficient Polypropionate Synthesis. J Org Chem 2008; 74:64-74. [DOI: 10.1021/jo8021583] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-François Brazeau
- Institut de recherches cliniques de Montréal (IRCM), Bio-organic Chemistry Laboratory, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7, Department of Chemistry, Université de Montréal, C.P. 6128, succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7, and Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada H3A 2K6
| | - Philippe Mochirian
- Institut de recherches cliniques de Montréal (IRCM), Bio-organic Chemistry Laboratory, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7, Department of Chemistry, Université de Montréal, C.P. 6128, succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7, and Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada H3A 2K6
| | - Michel Prévost
- Institut de recherches cliniques de Montréal (IRCM), Bio-organic Chemistry Laboratory, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7, Department of Chemistry, Université de Montréal, C.P. 6128, succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7, and Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada H3A 2K6
| | - Yvan Guindon
- Institut de recherches cliniques de Montréal (IRCM), Bio-organic Chemistry Laboratory, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7, Department of Chemistry, Université de Montréal, C.P. 6128, succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7, and Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada H3A 2K6
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Halvorsen GT, Roush WR. Siloxacyclopentenes as dienophile-linked directing groups in intramolecular Diels-Alder reactions. Org Lett 2008; 10:5313-6. [PMID: 18954061 DOI: 10.1021/ol802266s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis and intramolecular Diels-Alder reactions of trienes 5 and 6 with a siloxacyclopentene-constrained dienophile are described. These reactions provide the primary cycloadducts 7 and 8 with high diastereoselectivity. These cycloadducts possess trans-relationships between the ring fusion proton and the adjacent C(1) alkoxy group and can be further elaborated to alcohols 9 and 11 (via protiodesilylation) or to 10 and 12 (via Fleming-Tamao oxidation) depending on the substitutent R.
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Affiliation(s)
- Geoff T Halvorsen
- Department of Chemistry, Scripps-Florida, Jupiter, Florida 33458, USA
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29
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Vishnevskiy YV, Abaev MA, Ivanov AA, Vilkov LV, Dakkouri M. Molecular structure of tris(cyclopropylsilyl)amine as determined by gas electron diffraction and quantum-chemical calculations. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.02.013] [Citation(s) in RCA: 2] [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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30
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Robles O, McDonald FE. Modular Synthesis of the C9−C27 Degradation Product of Aflastatin A via Alkyne−Epoxide Cross-Couplings. Org Lett 2008; 10:1811-4. [DOI: 10.1021/ol800659z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Omar Robles
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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31
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Robertson J, Green SP, Hall MJ, Tyrrell AJ, Unsworth WP. Further studies on silatropic carbonyl ene cyclisations: β-crotyl(diphenyl)silyloxy aldehyde substrates; synthesis of 2-deoxy-2-C-phenylhexoses. Org Biomol Chem 2008; 6:2628-35. [DOI: 10.1039/b804752a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Waetzig JD, Hanson PR. A multifaceted phosphate tether: application to the C1-C14 subunit of dolabelides A-D. Org Lett 2007; 10:109-12. [PMID: 18062695 DOI: 10.1021/ol7025944] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A phosphate tether approach to the C1-14 subunit of dolabelide is described. The phosphate tether serves a multifaceted role mediating several processes, including (i) diastereotopic differentiation via RCM, (ii) selective CM by imparting Type III behavior to the exocyclic olefin, (iii) regioselective hydrogenation, and (iv) regioselective Pd(0)-catalyzed reductive opening of the bicyclic phosphate. Overall, this strategy uses orthogonal protecting- and leaving-group properties innate to phosphate esters to rapidly assembly the titled subunit.
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Affiliation(s)
- Joshua D Waetzig
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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33
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Das S, Abraham S, Sinha SC. Studies toward the Total Synthesis of Sorangiolides and Their Analogues. A Convergent Stereoselective Synthesis of the Macrocyclic Lactone Precursors. Org Lett 2007; 9:2273-6. [PMID: 17503834 DOI: 10.1021/ol070517g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stereoselective synthesis of the fully protected 18-membered macrocyclic lactones as the immediate precursors of the natural products, sorangiolides A and B, is described. The key steps used in the synthesis include the sp3-hybridized carbon-carbon Fu cross coupling, the stereoselective Evans' aldol reaction with 1,5-anti induction, the 1,3-diastereoselective syn reduction of a beta-hydroxyketone intermediate, and Mukaiyama macrolactonization reactions.
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Affiliation(s)
- Sanjib Das
- The Skaggs Institute for Chemical Biology and the Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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34
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Kumaraswamy G, Markondaiah B. Stereoselective synthesis of belactosin C and its derivatives using a catalytic proline catalyzed crossed-aldol reaction. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.01.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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35
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Ward DE, Beye GE, Sales M, Alarcon IQ, Gillis HM, Jheengut V. Thiopyran Route to Polypropionates: Exploiting and Overcoming Double Stereodifferentiation and Mutual Kinetic Enantioselection in Aldol Couplings of Chiral Fragments. J Org Chem 2007; 72:1667-74. [PMID: 17261069 DOI: 10.1021/jo0622532] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aldol reaction of tetrahydro-4H-thiopyranone with 1,4-dioxa-8-thiaspiro[4.5]decane-6-carboxaldehyde (I) gives four possible diastereomeric adducts (II). Aldol reactions of I with each of the diastereomers of II and their corresponding methoxymethyl ethers III via the Ti enolates were investigated. Using racemic reactants, reactions with II proceeded with high levels of mutual kinetic enantioselection (MKE) and double stereodifferentiation (DS) to give one of the eight possible bisaldol adducts. Similar reactions of III proceeded with low levels of MKE and DS and gave two bisaldol adducts, one from each of the possible combinations of enantiomeric reactants. By extension, 11 of the 20 possible diastereomers of the bisaldol adduct could be obtained selectively. These adducts are useful for polypropionate synthesis.
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Affiliation(s)
- Dale E Ward
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon SK S7N 5C9, Canada.
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36
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Wang X, Meng Q, Perl NR, Xu Y, Leighton JL. Tandem Aldol−Allylation and Aldol−Aldol Reactions with Ketone-Derived Enolsilanes: Highly Diastereoselective Single-Step Synthesis of Complex Tertiary Carbinols. J Am Chem Soc 2005; 127:12806-7. [PMID: 16159267 DOI: 10.1021/ja053593s] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new tandem aldol-allylation reaction employing ketone-derived enolates has been developed that leads to the rapid, diastereoselective synthesis of tertiary carbinol containing fragments with relevance to polyketide natural product synthesis. In addition, the use of ketone-derived enolates has led to the development of a new tandem aldol-aldol reaction.
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Affiliation(s)
- Xiaolun Wang
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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37
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Karisalmi K, Koskinen AM. Stereoselective synthesis of the C9–C19 lactone-dipropionate fragment of calyculin C. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.012] [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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38
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Defosseux M, Blanchard N, Meyer C, Cossy J. Total Synthesis of Zincophorin and Its Methyl Ester. J Org Chem 2004; 69:4626-47. [PMID: 15230584 DOI: 10.1021/jo0496042] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A total synthesis of the naturally occurring ionophore zincophorin has been realized. The route features an intramolecular oxymercuration of a cyclopropanemethanol and a Carroll-Claisen rearrangement for the respective elaboration of the C1-C12 and C13-C25 subunits, which have been assembled by using a highly diastereoselective titanium-mediated aldol condensation.
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Affiliation(s)
- Magali Defosseux
- Laboratoire de Chimie Organique, asocié au CNRS, ESPCI, 10 rue Vauquelin 75231 Paris Cedex 05 - France
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39
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Zacuto MJ, O'Malley SJ, Leighton JL. Tandem silylformylation–allyl(crotyl)silylation: a new approach to polyketide synthesis. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.04.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Defosseux M, Blanchard N, Meyer C, Cossy J. Total Synthesis of Zincophorin Methyl Ester. Org Lett 2003; 5:4037-40. [PMID: 14572243 DOI: 10.1021/ol035177n] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text]. A convergent total synthesis of the methyl ester of zincophorin, an ionophore antibiotic, has been realized relying on a diastereoselective titanium-mediated aldol coupling between the C1-C12 and C13-C25 subunits. The latter fragment was prepared by using a Carroll-Claisen rearrangement.
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Affiliation(s)
- Magali Defosseux
- Laboratoire de Chimie Organique, associé au CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France
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41
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Pihko PM, Erkkilä A. Enantioselective synthesis of prelactone B using a proline-catalyzed crossed-aldol reaction. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.08.060] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Berger R, Rabbat PMA, Leighton JL. Toward a versatile allylation reagent: practical, enantioselective allylation of acylhydrazones using strained silacycles. J Am Chem Soc 2003; 125:9596-7. [PMID: 12904019 DOI: 10.1021/ja035001g] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly practical method for the enantioselective allylation of acylhydrazones has been developed. The previously reported strained silacycle reagent 1 reacts with a wide variety of acylhydrazones to give the hydrazide products with good enantioselectivity (83-89% ee, typically). It has been demonstrated that the products may be isolated without chromatography by recrystallization in >/=98% ee.
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Affiliation(s)
- Richard Berger
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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