1
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Zhao D, Ren J, Wang Q, Zhang Y. Synthesis of deuterium-labeled nelarabine and its active ingredient, ara-G. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07193-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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2
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Reverse ketal-acetal rearrangement of levoglucosenone and cyclohexanone Michael adducts and the possibilities of its use in the synthesis of native topology lactones. Chem Heterocycl Compd (N Y) 2019. [DOI: 10.1007/s10593-019-02506-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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3
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Mormul J, Breitenfeld J, Trapp O, Paciello R, Schaub T, Hofmann P. Synthesis of Adipic Acid, 1,6-Hexanediamine, and 1,6-Hexanediol via Double-n-Selective Hydroformylation of 1,3-Butadiene. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00189] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jaroslaw Mormul
- Catalysis
Research Laboratory (CaRLa), University of Heidelberg, Im Neuenheimer
Feld 584, D-69120 Heidelberg, Germany
| | - Jan Breitenfeld
- Catalysis
Research Laboratory (CaRLa), University of Heidelberg, Im Neuenheimer
Feld 584, D-69120 Heidelberg, Germany
| | - Oliver Trapp
- Catalysis
Research Laboratory (CaRLa), University of Heidelberg, Im Neuenheimer
Feld 584, D-69120 Heidelberg, Germany
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Rocco Paciello
- BASF SE, Carl-Bosch-Strasse
38, D-67056 Ludwigshafen, Germany
| | - Thomas Schaub
- Catalysis
Research Laboratory (CaRLa), University of Heidelberg, Im Neuenheimer
Feld 584, D-69120 Heidelberg, Germany
- BASF SE, Carl-Bosch-Strasse
38, D-67056 Ludwigshafen, Germany
| | - Peter Hofmann
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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4
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Li J, Noyori S, Nakajima K, Nishihara Y. New Entry to the Synthesis of α-Iminonitriles by Lewis Acid Mediated Isomerization of Cyano-Substituted Iminoisobenzofurans Prepared by Palladium-Catalyzed Three-Component Coupling of Arynes, Isocyanides, and Cyanoformates. Organometallics 2014. [DOI: 10.1021/om500408h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jing Li
- Division of Earth, Life, and Molecular Sciences,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Shintaro Noyori
- Division of Earth, Life, and Molecular Sciences,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kiyohiko Nakajima
- Department of Chemistry, Faculty of Education, Aichi University of Education, 1 Hirosawa, Igaya, Kariya, Aichi 448-8542, Japan
| | - Yasushi Nishihara
- Division of Earth, Life, and Molecular Sciences,
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
- ACT-C, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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5
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Huang J, Yang JR, Zhang J, Yang J. Total synthesis and structure-activity relationship study of the potent cAMP signaling agonist (-)-alotaketal A. Org Biomol Chem 2013; 11:3212-22. [PMID: 23584129 DOI: 10.1039/c3ob40120k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A detailed account of the first total synthesis of alotaketal A, a tricyclic spiroketal sesterterpenoid that potently activates the cAMP signaling pathway, is provided. The synthesis employs both intra- and intermolecular reductive allylation of esters for assembling one of the fragments and their coupling. A Hg(OAc)2-mediated allylic mercuration is used to introduce the C22-hydroxyl group. The subtle influence of substituents over the course of the spiroketalization process is revealed. The synthesis confirms the relative and absolute stereochemistry of (-)-alotaketal A and allows verification of alotaketal A's effect over cAMP signaling using reporter-based FRET imaging assays with HEK 293T cells. Our studies also revealed alotaketal A's unique activity in selectively targeting nuclear PKA signaling in living cells.
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Affiliation(s)
- Jinhua Huang
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
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6
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Castillo RR, Abet V, Aquino M, Gandara Z, Retailleau P, Arseniyadis S. Increasing the Dimensionality of Modular Domino Reactions Triggered by Oxidative Cleavage: A Two-Step Protocol Towards a Variety of Stereodefined Complex Oxygen Heterocycles. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201483] [Citation(s) in RCA: 3] [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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7
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Huang J, Yang JR, Zhang J, Yang J. Total synthesis of the potent cAMP signaling agonist (-)-alotaketal A. J Am Chem Soc 2012; 134:8806-9. [PMID: 22563931 DOI: 10.1021/ja303529z] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed a convergent synthetic route to the potent cAMP signaling agonist (-)-alotaketal A that employs two stages of SmI(2)-mediated reductive allylation reactions for assembling the polycycle and fragment coupling. Also notable are a Hg(OAc)(2)-mediated selective alkene oxidation and the subtlety of the formation of the unprecedented spiroketal ring system. The probes AKAR4 and ICUE3 were used to evaluate the cAMP singaling agonistic activity of (-)-alotaketal A and elucidate its structure-activity relationship.
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Affiliation(s)
- Jinhua Huang
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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8
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Castillo RR, Aquino M, Gandara Z, Safir I, Elkhayat Z, Retailleau P, Arseniyadis S. Diverging Pathways to Topologically Complex Polycyclic Bis-acetals and Their Ring System Interchange. Org Lett 2012; 14:1628-31. [DOI: 10.1021/ol300388b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rafael R. Castillo
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Maurizio Aquino
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Zoila Gandara
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Imad Safir
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Zobida Elkhayat
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Pascal Retailleau
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
| | - Siméon Arseniyadis
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, F-91198 Gif-sur-Yvette Cedex, France
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9
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Williams DR, Plummer SV, Patnaik S. Studies for the enantiocontrolled preparation of substituted tetrahydropyrans: Applications for the synthesis of leucascandrolide A macrolactone. Tetrahedron 2011; 67:5083-5097. [PMID: 24014149 PMCID: PMC3763842 DOI: 10.1016/j.tet.2011.05.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Strategies for the stereocontrolled preparations of 2,6-cis-and 2,6-trans-substituted tetrahydropyrans have been devised. These studies have explored methodology for asymmetric induction in SE' reactions using chiral 1,3,2-diazaborolidine controllers. Reactions with aldehydes at -78 °C yield nonracemic 1,5-diols for chemoselective internal backside displacements. This concept is developed as a flexible and reliable strategy in studies toward leucascandrolide A macrolactone 2 via the sequential applications of SE' reactions leading to the C1-C9 aldehyde 14, and the bis-tetrahydropyran 59, respectively.
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Affiliation(s)
- David R. Williams
- Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
| | - Scott V. Plummer
- Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
| | - Samarjit Patnaik
- Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
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10
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Asymmetric synthesis and σ receptor affinity of enantiomerically pure 1,4-disubstituted tetrahydro-1H-3-benzazepines. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Mak S, Curtis N, Payne A, Congreve M, Wildsmith A, Francis C, Davies J, Pascu S, Burton J, Holmes A. Synthesis of (+)-Obtusenyne. Chemistry 2008; 14:2867-85. [DOI: 10.1002/chem.200701567] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Riatto VB, Pilli RA, Victor MM. Fifteen years of biological and synthetic studies of decarestrictine family. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.034] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Yamamoto H. From designer Lewis acid to designer Brønsted acid towards more reactive and selective acid catalysis. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2008; 84:134-46. [PMID: 18941293 PMCID: PMC2858369 DOI: 10.2183/pjab.84.134] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2008] [Accepted: 02/28/2008] [Indexed: 05/26/2023]
Abstract
This review focuses on the development of acid catalysis for selective organic transformations conducted in our laboratories for the past 30 years. Several important concepts in designing of catalysts are described with some examples. Further, recent developments in super Brønsted acid and their applications in a one-pot procedure to construct complex molecules with high diastereoselectivities are described.(Communicated by Hitosi NOZAKI, M.J.A.).
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Affiliation(s)
- Hisashi Yamamoto
- Department of Chemistry, The University of Chicago, Chicago, Chicago, IL 60637, USA.
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14
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15
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Asami M, Taketoshi A, Miyoshi K, Hoshino H, Sakakibara K. Highly Diastereoselective Conjugate Addition of Aryllithium to Chiral β-Nitrostyrene Derivative: An Application to the Asymmetric Synthesis of 4-Aryl-1,2,3,4-tetrahydroisoquinoline. CHEM LETT 2007. [DOI: 10.1246/cl.2007.64] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Crawford C, Nelson A, Patel I. Development of an Approach to the Synthesis of the ABC Ring System of Hemibrevetoxin B. Org Lett 2006; 8:4231-4. [PMID: 16956194 DOI: 10.1021/ol0614323] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient approach for the synthesis of a model of the ABC ring system of Hemibrevetoxin B is described. Key features include a ring expansion to yield the ring C oxepane, the reduction of a 2-furyl ketone with high levels of 1,3-stereocontrol, and an Achmatowicz oxidative ring expansion to yield the ring A tetrahydropyran. All seven stereogenic centers present in the model compound were controlled with high levels (>98:<2) of diastereoselectivity.
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17
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Mori S, Iwamoto S, Yamauchi S. Synthesis of a glandular secretion of the civet cat, (2S,6S)-(6-methyltetrahydropyran-2-yl)acetic acid and its enantiomer, by using the yeast-reduction product and recovered substrate from yeast reduction. Biosci Biotechnol Biochem 2006; 70:712-7. [PMID: 16556990 DOI: 10.1271/bbb.70.712] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A glandular secretion of the civet cat, (2S,6S)-(6-methyltetrahydropyran-2-yl)acetic acid 1 and its enantiomer, were synthesized from the yeast-reduction product and recovered substrate from yeast reduction.
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Affiliation(s)
- Shunji Mori
- Faculty of Agriculture, Ehime University, Ehime, Japan
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18
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A tandem C–H insertion—acetal cleavage sequence: stereocontrolled synthesis of substituted tetrahydrofurans. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.08.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Morelli CF, Fornili A, Sironi M, Durì L, Speranza G, Manitto P. Evidence for a nucleophilic anti-attack on the cleaved C(2)–oxygen bond in Cl2AlH-catalyzed ring-opening of 2-substituted 1,3-dioxolanes. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.01.108] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Intramolecular Involvement of an Oxygen-containing Nucleophilic Group in Epoxy Ring Opening. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2005. [DOI: 10.1007/s11178-005-0141-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Alvarez-Manzaneda E, Romera J, Barrero A, Alvarez-Manzaneda R, Chahboun R, Meneses R, Aparicio M. Synthetic approach to pentacyclic quassinoids from communic acids, via ambracetal derivatives. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.11.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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22
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Dandapani S, Jeske M, Curran DP. Stereoisomer libraries: total synthesis of all 16 stereoisomers of the pine sawfly sex pheromone by a fluorous mixture-synthesis approach. Proc Natl Acad Sci U S A 2004; 101:12008-12. [PMID: 15159539 PMCID: PMC514425 DOI: 10.1073/pnas.0401677101] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
All 16 stereoisomers of the sex pheromone of pine sawfly (3,7,11-trimethylundecanol propanoate ester) have been synthesized on a 10- to 20-mg scale by a split-parallel fluorous mixture-synthesis approach. Spectral data obtained for all 32 compounds (16 alcohols and the corresponding propionates) matched well with published data, thereby validating the fluorous-tag encoding of diastereoisomers. This fluorous-tag encoding method is recommended for the efficient synthesis of multiple stereoisomers for spectroscopic studies, biological tests, or other structure-function relationships.
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Affiliation(s)
- Sivaraman Dandapani
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
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23
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Yang X, Luo S, Hua C, Zhai H. Efficient synthesis of beetle aggregation pheromone frontalin and its analogues. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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24
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Carreño MC, Des Mazery R, Urbano A, Colobert F, Solladié G. Reductive Cyclizations of Hydroxysulfinyl Ketones: Enantioselective Access to Tetrahydropyran and Tetrahydrofuran Derivatives. J Org Chem 2003; 68:7779-87. [PMID: 14510555 DOI: 10.1021/jo034817x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereocontrolled formation of cis-2,5-disubstituted tetrahydrofurans and cis-2,6-disubstituted tetrahydropyrans is achieved from enantiopure ketosulfinyl esters by reduction, Weinreb's amide, and ketone formation, followed by the reductive cyclization (Et3SiH/TMSOTf) of the resulting hydroxysulfinyl ketones. The sulfoxide-bearing heterocycles were transformed into two natural products, (-)-centrolobine (1) and both enantiomers of cis-(6-methyltetrahydropyran-2-yl)acetic acid (2).
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Affiliation(s)
- M Carmen Carreño
- Departamento de Química Orgánica (C-I), Universidad Autónoma, Cantoblanco, 28049-Madrid, Spain.
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25
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Roush WR, Newcom JS. Studies on the synthesis of tedanolide. 2. Stereoselective synthesis of a protected C(1)-C(12) fragment. Org Lett 2002; 4:4739-42. [PMID: 12489975 DOI: 10.1021/ol0272343] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Highly diastereoselective syntheses of diketo esters 6a and 6b are described. These intermediates undergo efficient aldol reactions with protected C(13)-C(21) aldehydes 3 and 23, thereby providing advanced C(1)-C(21) tedanolide seco ester precursors 9a and 9b.
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Affiliation(s)
- William R Roush
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA.
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26
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Morelli CF, Fornili A, Sironi M, Durı̀ L, Speranza G, Manitto P. Regio- and diastereoselectivity in TiCl4-promoted reduction of 2-aryl-substituted cis-4-methyl-5-trifluoromethyl-1,3-dioxolanes. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00687-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Francisco CG, Herrera AJ, Suárez E. Intramolecular hydrogen abstraction reaction promoted by alkoxy radicals in carbohydrates. Synthesis of chiral 2,7-dioxabicyclo[2.2.1]heptane and 6,8-dioxabicyclo[3.2.1]octane ring systems. J Org Chem 2002; 67:7439-45. [PMID: 12375977 DOI: 10.1021/jo026004z] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of specifically protected anhydroalditols with (diacetoxyiodo)benzene or iodosylbenzene and iodine is a mild and selective procedure for the synthesis of chiral 6,8-dioxabicyclo[3.2.1]octane and 2,7-dioxabicyclo[2.2.1]heptane ring systems under neutral conditions. This reaction can be considered to be an intramolecular glycosidation that goes through an intramolecular hydrogen abstraction promoted by an alkoxy radical followed by oxidation of the transient C-radical intermediate to an oxycarbenium ion. This methodology is useful not only for the preparation of chiral synthons but also for the selective oxidation of specific carbons of the carbohydrate skeleton, constituting a good procedure for the synthesis of protected uloses.
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Affiliation(s)
- Cosme G Francisco
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
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28
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Roush WR, Bannister TD, Wendt MD, Jablonowski JA, Scheidt KA. Studies on the synthesis of bafilomycin A(1): stereochemical aspects of the fragment assembly aldol reaction for construction of the C(13)-C25) segment. J Org Chem 2002; 67:4275-83. [PMID: 12054963 DOI: 10.1021/jo016413f] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Highly stereoselective syntheses of aldols 8a-c corresponding to the C(13)-C(25) segment of bafilomycin A(1) were developed by routes involving fragment assembly aldol reactions of chiral aldehyde 6a and the chiral methyl ketones 7. A remote chelation effect plays a critical role in determining the stereoselectivity of the key aldol coupling of 6a and the lithium enolate of 7b. The protecting group for C(23)-OH of the chiral aldehyde fragment also influences the selectivity of the lithium enolate aldol reaction. In contrast, the aldol reaction of 6a and the chlorotitanium enolates of 7a,c were much less sensitive to the nature of the C(15)-hydroxyl protecting group. Studies of the reactions of chiral aldehydes with Takai's (gamma-methoxyallyl)chromium reagent 40 are also described. The stereoselectivity of these reactions is also highly dependent on the protecting groups and stereochemistry of the chiral aldehyde substrates.
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Affiliation(s)
- William R Roush
- Department of Chemistry, Indiana University, Bloomington 47405, USA.
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29
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Sasaki M, Noguchi T, Tachibana K. Intramolecular radical cyclization-ring-closing metathesis approach to fused polycyclic ethers. Convergent synthesis and conformational analysis of the (E)FGH ring system of ciguatoxin. J Org Chem 2002; 67:3301-10. [PMID: 12003539 DOI: 10.1021/jo010974p] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convergent synthetic route to the (E)FGH ring system 4 of ciguatoxins, the causative toxins for ciguatera fish poisoning, has been developed. The synthesis features convergent coupling to form dioxane acetal, regioselective acetal cleavage by diethylaluminum phenylthiolate or diisobutylaluminum phenylselenolate followed by intramolecular radical cyclization to construct the oxepane ring G, and a ring-closing metathesis reaction to form the hexahydrooxonine ring F. The hexahydrooxonine ring F of tetracyclic model system 4 existed as a 5:1 equilibrium mixture of two conformers (UP and DOWN conformers), with the UP one predominating. This is the first illustration that reproduces the preference for the UP conformer over the DOWN one, which preference was observed for natural ciguatoxins.
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Affiliation(s)
- Makoto Sasaki
- Department of Chemistry, Graduate School of Science, The University of Tokyo, and CREST, Japan Science and Technology Corporation (JST), Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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30
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New synthesis of 2,6-anhydro-β-d-fructofuranoses, pivotal [2.2.1] bicyclic acetals for the conversion of d-fructose into 2,2,5-trisubstituted tetrahydrofurans. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00233-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Gauthier DR, Szumigala RH, Armstrong JD, Volante R. Stereoelectronic effects in the DIBAL reduction of aryl-1,2-ethanediol benzylidene acetals. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01466-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Steinreiber A, Edegger K, Mayer SF, Faber K. Enantio- and diastereo-convergent synthesis of (2R,5R)- and (2R,5S)-Pityol through enzyme-triggered ring closure. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0957-4166(01)00370-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bogaczyk S, Brescia MR, Shimshock YC, DeShong P. A highly stereoselective approach to the synthesis of functionalized pyran derivatives by Lewis acid assisted ketal reduction and allylation. J Org Chem 2001; 66:4352-5. [PMID: 11397176 DOI: 10.1021/jo010252y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reduction of bicyclic ketal 1 gave functionalized pyran derivatives 7a or 7b in a highly stereoselective manner, depending upon the reduction conditions utilized. For example, treatment of ketal 1 with TiCl4/Et3SiH produced exclusively diol 7b with the 2,5-syn relationship in good yield. Alternatively, reduction of ketal 1 by DIBALH gave 2,5-anti-diol 7a stereoselectively. Alane reductions of ketal 1 were highly stereoselective also; however, the syn/anti selectivity observed was strongly dependent on the ratio of reagents employed for in situ generation of the alane. Lewis acid catalyzed allylation of ketal 1 gave pyran 10 in a stereospecific alkylation reaction.
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Affiliation(s)
- S Bogaczyk
- Department of Chemistry and Biochemistry, The University of Maryland, College Park, Maryland 20742, USA
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Francisco* CG, Herrera AJ, Suárez E. Intramolecular hydrogen abstraction reaction in carbohydrate chemistry. Synthesis of chiral 2,7-dioxabicyclo[2.2.1]heptane and 6,8-dioxabicyclo[3.2.1]octane ring systems. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01393-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fujiwara K, Amano A, Tokiwano T, Murai A. Novel Oxepane Formation by TiCl4-Catalyzed Nucleophilic Cleavage of 1-Alkoxymethyl-6,8-dioxabicyclo[3.2.1]octanes. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00009-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hatakeyama S, Esumi T, Kimura R, Mori M, Iwabuchi Y, Irie H. Enantioselective Synthesis of (+)-Decarestrictine L from (2E,5E)-Dibenzyloxy-2,5-heptadien-4-ol. HETEROCYCLES 2000. [DOI: 10.3987/com-99-s60] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Magnesium bromide promoted Barbier-type intramolecular cyclization of halo-substituted acetals, ketals, and orthoesters. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)01813-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Brown B, Hegedus LS. Optically Active Cyclobutanone Chemistry: Synthesis of (−)-Cyclobut-A and (±)-3‘-Epi-Cyclobut-A. J Org Chem 1998. [DOI: 10.1021/jo9817063] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brian Brown
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Louis S. Hegedus
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
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Stereoselective synthesis of a 2,2,5-trisubstituted tetrahydropyran chiron via 1,3- and 1,6-asymmetric induction: A total synthesis of (−)-malyngolide. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00810-2] [Citation(s) in RCA: 14] [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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40
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Betancor C, Dorta RL, Freire R, Martín A, Prangé T, Suárez E. Stereospecific Synthesis of 1,6-Dioxadecalins and 2,2'-Linked Ditetrahydrofurans by Rearrangement of Steroidal Spiroacetals. J Org Chem 1998; 63:6355-6362. [PMID: 11672270 DOI: 10.1021/jo980834o] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reduction of steroidal spiroacetal methanesulfonate derivatives, containing the 1,6-dioxaspiro[4.5]decan-10-yl ring system, with DIBALH promotes a new rearrangement to give steroidal 1,6-dioxadecalin (octahydropyrano[3,2-b]pyran) or 2,2'-linked ditetrahydrofuran (octahydro[2,2']bifuranyl) derivatives. To study the scope and selectivity of the reaction, several steroidal spiroacetals such as (23R,25R)-3beta-methoxy-5alpha-spirostan-23-yl methanesulfonate (2) and its 23S-isomer (5) and (22R,23R,25R)-3beta-acetoxy-16beta,23:23,26-diepoxycholest-5-en-22-yl methanesulfonate (15) and its 22S-isomer (19) have been synthesized. Compound 2 was rearranged with absolute regio- and stereoselectivity to give (22S,23S,25R)-3beta-methoxy-16beta,23:22,26-diepoxy-5alpha-cholestane (3) which possesses a cis-fused 1,6-dioxadecalin ring system. The reaction of compound 5 gave exclusively (22S,23R,25R)-3beta-methoxy-23,26-epoxy-5alpha-furostane (6) in which the spiroacetal was converted into a ditetrahydrofuran subunit. The two other isomeric spiroacetals 15 and 19 were also mainly transformed into (22S,23S,25R)-3beta-acetoxy-16beta,23:22,26-diepoxycholest-5-ene (16) and (22R,23R,25R)-3beta-acetoxy-23,26-epoxyfurost-5-ene (20), respectively. A mechanism is proposed to explain the regio- and sterospecificity observed in the rearrangement.
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Affiliation(s)
- Carmen Betancor
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206-La Laguna, Tenerife, Spain, Instituto de Bio-Orgánica, Universidad de La Laguna, Tenerife, Spain, and LURE, Université Paris-Sud, Paris, 91405 ORSAY, Cedex, France
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Chern JH, Wu HJ. Chemical transformation of tetraacetal tetraoxa-cages to aza-cages and amido-cages mediated by iodotrimethylsilane and the combination of chlorotrimethylsilane and sodium iodide in nitriles. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00277-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Sasaki M, Inoue M, Noguchi T, Takeichi A, Tachibana K. Convergent and stereoselective method for synthesis of O -linked oxepane ring system by intramolecular radical cyclization. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)00338-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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43
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Hirota K, Monguchi Y, Kitade Y, Sajiki H. Ribofuranose-ring cleavage of purine nucleosides with diisobutylaluminum hydride: Convenient method for the preparation of purine acyclonucleosides. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)10098-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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44
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Jun JG, Lee DW. Ketal-lactone compounds and their stereoselective cleavage to cyclic ethers. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10196-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wu HJ, Chern JH. A Remarkable Effect of C-O-C Bond Angle Strain on the Regioselective Double Nucleophilic Substitution of the Acetal Group of Tetraacetal Tetraoxa-Cages and a Novel Hydride Rearrangement of Tetraoxa-Cages. J Org Chem 1997; 62:3208-3214. [PMID: 11671705 DOI: 10.1021/jo962285x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A remarkable effect of C-O-C bond angle strain on the regioselective double nucleophilic substitution of the acetal group of tetraacetal tetraoxa-cages and a novel regioselective and stereoselective hydride rearrangement of tetraoxa-cages are reported. Reaction of the tetraacetal tetraoxa-cages 1 with 3 equiv of triethylsilane (at -78 degrees C), cyanotrimethylsilane (at 25 degrees C), and allyltrimethylsilane (at -78 degrees C) in dichloromethane in the presence of TiCl(4) gave the double nucleophilic substitution products 2, 6, and 7 in 85-90% yields, respectively. No detectable amount of other regioisomers was obtained. Reaction of 1a with (methylthio)trimethylsilane and (phenylthio)trimethylsilane in dichloromethane in the presence of TiCl(4) at -78 degrees C gave the symmetric products 10a,b and the unsymmetric products 11a,b in ratios of 8-10:1. The stereochemistry of the symmetric substitution products was proven by X-ray analysis of the crystalline compound 10a. The mechanism of the double nucleophilic substitution of the tetraoxa-cages 1 are discussed. Treatment of the tetraoxa-cages 1a,c and 22a-c with 2 equiv of TiCl(4) or MeSO(3)H in dichloromethane at 25 degrees C for 3 h regioselectively and stereoselectively gave the novel hydride rearrangement products 16a,b and 23a-c respectively. No detectable amount of other regioisomers was observed. The stereochemistry of the hydride rearrangement was proven by DIBAL-H reduction of 16 and 23 and X-ray analysis of the reduction product 24a. We attribute the high regioselectivity of the double nucleophilic substitution and the hydride rearrangement of the tetraoxa-cages 1 to the bond angle strain of the unusually large bond angle of C(3)-O(4)-C(5) of the tetraoxa-cages.
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Affiliation(s)
- Hsien-Jen Wu
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan, China
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Sato T, Otera J. Mechanistic insight into the cinnamylmetal-thioacetal reaction employing 2-acetoxy-2-phenylacetaldehyde monothioacetal. J Organomet Chem 1994. [DOI: 10.1016/0022-328x(94)80105-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sugimura T, Tai A, Koguro K. Total syntheses of (+)-ipomeamarone and (−)-ngaione via novel intramolecular hydrogen abstraction. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85659-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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49
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Oikawa H, Oikawa M, Ichihara A, Kobayashi K, Uramoto M. Highly regio- and stereoselective reductions of spiroketals. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)73980-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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50
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