1
|
Beller MP, Ivlev S, Koert U. Preussochromone Puzzle: Structural Revision of Preussochromones E and F by Total Synthesis. Org Lett 2022; 24:912-915. [PMID: 35041436 DOI: 10.1021/acs.orglett.1c04261] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A stereoselective synthesis of the proposed and actual structures of the natural products preussochromones E and F is reported. The key step is a ring-closing metathesis to close the five-membered ring and install the trans configuration of the annulated five-six ring system. The analysis of the 3J NMR couplings of the isolated natural product with the synthesized compound revealed its real structure with a cis annulation, which could also be synthesized using an intramolecular aldol reaction of a vic-tricarbonyl compound.
Collapse
Affiliation(s)
- Marc Paul Beller
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
| | - Sergei Ivlev
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
| | - Ulrich Koert
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
| |
Collapse
|
2
|
Rashid S, Bhat BA, Mehta G. Conceptualization and Synthesis of the First Inosito-Inositol (Decahydroxydecalin, DHD): In silico Binding to β-Amyloid Protein. Chemistry 2020; 26:17005-17010. [PMID: 32783222 DOI: 10.1002/chem.202003367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/04/2020] [Indexed: 11/10/2022]
Abstract
Previously unknown entities in the form of 1,2,3,4,5,6,7,8,9,10-decahydroxydecalins (DHDs) have been conceptualized and the first member of this class, an inosito-inositol, has been synthesized from aromatic hydrocarbon naphthalene following a flexible strategy that is amenable to diversity creation. The DHD accessed here has been subjected to preliminary in silico evaluation with Aβ and may hold some promise in Alzheimer's disease therapeutics.
Collapse
Affiliation(s)
- Showkat Rashid
- CSIR -, Indian Institute of Integrative Medicine, Sanatnagar, Srinagar, 190005 Jammu & Kashmir, India.,Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, 180001, India
| | - Bilal A Bhat
- CSIR -, Indian Institute of Integrative Medicine, Sanatnagar, Srinagar, 190005 Jammu & Kashmir, India.,Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, 180001, India
| | - Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad, 500046, India
| |
Collapse
|
3
|
Schäfer A, Köhler SC, Lohe M, Wiese M, Hiersemann M. Synthesis of Homoverrucosanoid-Derived Esters and Evaluation as MDR Modulators. J Org Chem 2017; 82:10504-10522. [PMID: 28949536 DOI: 10.1021/acs.joc.7b02012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The synthesis of the A-B-cis,B-C-trans-annulated cyclohepta[e]hydrindane core of a gagunin E analogue is reported in detail. The tricarbocyclic scaffold was assembled starting from an easily accessible A ring building block by a (4 + 2)-cycloaddition for annulation of the B ring. A ring-closing metathesis served for construction of the seven-membered C ring. The angular methyl groups were attached by electrophilic cyclopropanation-ring opening. A library based on the most active lead compound was made accessible by esterification of the terpenols with commercially available acids. A transannular etherification reaction gave access to tetracyclic derivatives of the synthetic inhibitors. The members of the compound library of non-natural homoverrucosanoid-derived esters were examined as modulators of the membrane transporter proteins ABCB1 (P-gp), ABCG2 (BCRP), and ABCC1 (MRP1), which are involved in the formation of multidrug resistance (MDR) in cancer chemotherapy.
Collapse
Affiliation(s)
- Andreas Schäfer
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund , 44227 Dortmund, Germany
| | - Sebastian C Köhler
- Pharmazeutisches Institut, Pharmazeutische Chemie II, Universität Bonn , 53121 Bonn, Germany
| | - Markus Lohe
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund , 44227 Dortmund, Germany
| | - Michael Wiese
- Pharmazeutisches Institut, Pharmazeutische Chemie II, Universität Bonn , 53121 Bonn, Germany
| | - Martin Hiersemann
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund , 44227 Dortmund, Germany
| |
Collapse
|
4
|
Noda N, Nambu H, Fujiwara T, Yakura T. Total Synthesis of Sphingofungin E and 4,5-Di-epi-sphingofungin E. Chem Pharm Bull (Tokyo) 2017; 65:687-696. [PMID: 28674344 DOI: 10.1248/cpb.c17-00322] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Total synthesis of sphingofungin E and 4,5-di-epi-sphingofungin E was achieved from an intermediate same as that of myriocin and mycestericin D via antipodal stereoselective dihydroxylations.
Collapse
Affiliation(s)
- Narumi Noda
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Hisanori Nambu
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Tomoya Fujiwara
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Takayuki Yakura
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| |
Collapse
|
5
|
A monocyclic neodysiherbaine analog: Synthesis and evaluation. Bioorg Med Chem Lett 2016; 26:5164-5167. [DOI: 10.1016/j.bmcl.2016.09.074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 09/29/2016] [Indexed: 11/21/2022]
|
6
|
Csatayová K, Davies SG, Figuccia AL, Fletcher AM, Ford JG, Lee JA, Roberts PM, Saward BG, Song H, Thomson JE. Asymmetric syntheses of polysubstituted homoprolines and homoprolinols. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
7
|
Willwacher J, Heggen B, Wirtz C, Thiel W, Fürstner A. Total Synthesis, Stereochemical Revision, and Biological Reassessment of Mandelalide A: Chemical Mimicry of Intrafamily Relationships. Chemistry 2015; 21:10416-30. [PMID: 26094957 DOI: 10.1002/chem.201501491] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Indexed: 11/06/2022]
Abstract
Mandelalide A and three congeners had recently been isolated as the supposedly highly cytotoxic principles of an ascidian collected off the South African coastline. Since these compounds are hardly available from the natural source, a concise synthesis route was developed, targeting structure 1 as the purported representation of mandelalide A. The sequence involves an iridium-catalyzed two-directional Krische allylation and a cobalt-catalyzed carbonylative epoxide opening as entry points for the preparation of the major building blocks. The final stages feature the first implementation of terminal acetylene metathesis into natural product total synthesis, which is remarkable in that this class of substrates had been beyond the reach of alkyne metathesis for decades. Synthetic 1, however, proved not to be identical with the natural product. In an attempt to clarify this issue, NMR spectra were simulated for 20 conceivable diastereomers by using DFT followed by DP4 analysis; however, this did not provide a reliable assignment either. The puzzle was ultimately solved by the preparation of three diastereomers, of which compound 6 proved identical with mandelalide A in all analytical and spectroscopic regards. As the entire "northern sector" about the tetrahydrofuran ring in 6 shows the opposite configuration of what had originally been assigned, it is highly likely that the stereostructures of the sister compounds mandelalides B-D must be corrected analogously; we propose that these natural products are accurately represented by structures 68-70. In an attempt to prove this reassignment, an entry into mandelalides C and D was sought by subjecting an advanced intermediate of the synthesis of 6 to a largely unprecedented intramolecular Morita-Baylis-Hillman reaction, which furnished the γ-lactone derivative 74 as a mixture of diastereomers. Whereas (24R)-74 was amenable to a hydroxyl-directed dihydroxylation by using OsO4 /TMEDA as the reagent, the sister compound (24S)-74 did not follow a directed path but simply obeyed Kishi's rule; only this unexpected escape precluded the preparation of mandelalides C and D by this route. A combined spectroscopic and computational (DFT) study showed that the reasons for this strikingly different behavior of the two diastereomers of 74 are rooted in their conformational peculiarities. This aspect apart, our results show that the OsO4 /TMEDA complex reacts preferentially with electron deficient double bonds even if other alkenes are present that are more electron rich and less encumbered. Finally, in a brief biological survey authentic mandelalide A (6) was found to exhibit appreciable cytotoxicity only against one out of three tested human cancer cell lines and all synthetic congeners were hardly active. No significant fungicidal properties were observed.
Collapse
Affiliation(s)
- Jens Willwacher
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr (Germany)
| | - Berit Heggen
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr (Germany)
| | - Conny Wirtz
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr (Germany)
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr (Germany)
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr (Germany).
| |
Collapse
|
8
|
Jeon J, Shin N, Kim YG. Stereocontrolled Dihydroxylation Reactions of Acyclic Allylic Amines. APPLIED CHEMISTRY FOR ENGINEERING 2014. [DOI: 10.14478/ace.2014.1113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
9
|
Hartung J, Grubbs RH. Catalytic, enantioselective synthesis of 1,2-anti-diols by asymmetric ring-opening/cross-metathesis. Angew Chem Int Ed Engl 2014; 53:3885-8. [PMID: 24554613 PMCID: PMC4037230 DOI: 10.1002/anie.201310767] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Indexed: 01/14/2023]
Abstract
An enantioselective method for the synthesis of 1,2-anti-diols has been developed. A cyclometalated chiral-at-ruthenium complex catalyzes the asymmetric ring-opening/cross-metathesis of dioxygenated cyclobutenes, thus resulting in functionally rich synthetic building blocks. Syntheses of the insect pheromone (+)-endo-brevicomin and monosaccharide ribose demonstrate the synthetic utility of the 1,2-anti-diol fragments generated in the title reaction.
Collapse
Affiliation(s)
- John Hartung
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Robert H. Grubbs
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| |
Collapse
|
10
|
Hartung J, Grubbs RH. Catalytic, Enantioselective Synthesis of 1,2-anti-Diols by Asymmetric Ring-Opening/Cross-Metathesis. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310767] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
11
|
Singh P, Manna SK, Panda G. Synthesis of polyhydroxylated indolizidines and piperidines from Garner's aldehyde: total synthesis of (−)-swainsonine, (+)-1,2-di-epi-swainsonine, (+)-8,8a-di-epi-castanospermine, pentahydroxy indolizidines, (−)-1-deoxynojirimycin, (−)-1-deoxy-altro-nojirimycin, and related diversity. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.11.074] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
12
|
Csatayová K, Davies SG, Ford JG, Lee JA, Roberts PM, Thomson JE. Asymmetric Syntheses of Methyl N,O-Diacetyl-d-3-epi-daunosaminide and Methyl N,O-Diacetyl-d-ristosaminide. J Org Chem 2013; 78:12397-408. [DOI: 10.1021/jo4020563] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kristína Csatayová
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Stephen G. Davies
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - J. Gair Ford
- AstraZeneca Pharmaceutical
Development, Silk Road Business Park, Macclesfield, Cheshire SK10 2QH, U.K
| | - James A. Lee
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James E. Thomson
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| |
Collapse
|
13
|
El-Mansy MF, Sar A, Lindeman S, Donaldson WA. Generation of Molecular Complexity from Cyclooctatetraene: Preparation of Optically Active Protected Aminocycloheptitols and Bicyclo[4.4.1]undecatriene. Chemistry 2013; 19:2330-6. [DOI: 10.1002/chem.201203754] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Indexed: 11/11/2022]
|
14
|
Ma Z, Naylor BC, Loertscher BM, Hafen DD, Li JM, Castle SL. Regioselective base-free intermolecular aminohydroxylations of hindered and functionalized alkenes. J Org Chem 2012; 77:1208-14. [PMID: 22188212 DOI: 10.1021/jo202375a] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Regioselective base-free intermolecular aminohydroxylations of functionalized trisubstituted and 1,1-disubstituted alkenes employing benzoyloxycarbamate 3a and catalytic OsO(4) are described. In all cases, the more substituted alcohol isomer is favored. Sluggish reactions could be promoted by gentle heating, the use of amine ligands, or increased catalyst loadings. A competitive rearrangement was observed with a secondary allylic alcohol substrate. The adducts serve as useful precursors to dehydroamino acids.
Collapse
Affiliation(s)
- Zhiwei Ma
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
| | | | | | | | | | | |
Collapse
|
15
|
Csatayová K, Davies SG, Lee JA, Roberts PM, Russell AJ, Thomson JE, Wilson DL. Highly Diastereoselective and Stereodivergent Dihydroxylations of Acyclic Allylic Amines: Application to the Asymmetric Synthesis of 3,6-Dideoxy-3-amino-l-talose. Org Lett 2011; 13:2606-9. [DOI: 10.1021/ol200717n] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kristína Csatayová
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James A. Lee
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Angela J. Russell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - David L. Wilson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| |
Collapse
|
16
|
Markó IE, Giles PR, Janousek Z, Hindley NJ, Declercq JP, Tinant B, Feneau-Dupont J, Svendsen JS. Syn-Stereocontrolled dihydroxylation of Baylis-Hillman adducts. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19951140418] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
17
|
Paquette LA, Moura-Letts G, Wang GP. From D-glucose to enantiomerically pure cycloctanoses. The glycosidase inhibitory capacity of medium-ring carbasugars. J Org Chem 2010; 74:2099-107. [PMID: 19173597 DOI: 10.1021/jo802620h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Exhaustive dihydroxylation of the pair of cyclooctadienols consisting of 4 and 5, which are available in enantiomerically pure form from d-glucose, resulted in the formation of two diastereomeric tetraols in each case. The difference in polarity of the 6/7 and 8/9 pairs facilitated their chromatographic separation. Ensuing acetylation and PMB deprotection allowed for the assignment of relative (and ultimately absolute) stereochemistry to the resulting monohydric alcohols on the basis of J(HH) analysis of their (1)H NMR spectra. The highly functionalized exomethylenecyclooctanes 14-17, which were derived by periodinane oxidation and Wittig olefination, were further elaborated by hydroboration and global deprotection. The eight members of the cyclooctanose family of carbasugars and their precursor intermediates consistently showed patterns of J(HH) values in line with the contiguous stereochemical relationships. Also assayed was their specific inhibitory behavior toward glycosidases.
Collapse
Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA.
| | | | | |
Collapse
|
18
|
Sar A, Lindeman S, Donaldson WA. De novo synthesis of polyhydroxyl aminocyclohexanes. Org Biomol Chem 2010; 8:3908-17. [PMID: 20623062 DOI: 10.1039/c004730a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses of 12 stereochemically diverse polyhydroxyl aminocyclohexane ("aminocyclitols") derivatives are described. These short syntheses require 2-5 steps from N-(2,4-cyclohexadien-1-yl)phthalimide, which is prepared in two steps from tricarbonyl(cyclohexadienyl)iron(1+). The relative stereochemistries of the aminocyclitols were assigned by (1)H NMR spectroscopy as well as X-ray diffraction analysis.
Collapse
Affiliation(s)
- Anobick Sar
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI, USA
| | | | | |
Collapse
|
19
|
Wang P, Chun BK, Rachakonda S, Du J, Khan N, Shi J, Stec W, Cleary D, Ross BS, Sofia MJ. An Efficient and Diastereoselective Synthesis of PSI-6130: A Clinically Efficacious Inhibitor of HCV NS5B Polymerase. J Org Chem 2009; 74:6819-24. [DOI: 10.1021/jo901345j] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Peiyuan Wang
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Byoung-Kwon Chun
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | | | - Jinfa Du
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Noshena Khan
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Junxing Shi
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Wojciech Stec
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Darryl Cleary
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Bruce S. Ross
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| | - Michael J. Sofia
- Pharmasset, Inc., 303A College Road E., Princeton, New Jersey 08540
| |
Collapse
|
20
|
Anti-Selective Dihydroxylation Reactions of Monosubstituted and (E)-Ester Conjugated Allylic Amines by Bulky Alkyl Groups. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.5.1003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
21
|
Fernández de la Pradilla R, Lwoff N, Viso A. Stereoselective Functionalization of Dihydropyran-3-ols: Application to the Synthesis of Enantiopure Ethyl Deoxymonate B. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801133] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Fukui H, Shiina I. Total Synthesis of Botcinolides and Botcinins; Determination of the Structure of Natural Products Isolated from Botrytis cinerea. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
23
|
Moura-Letts G, Paquette LA. Contiguously Substituted Cyclooctane Polyols. Configurational Assignments via 1H NMR Correlations and Symmetry Considerations. J Org Chem 2008; 73:7663-70. [DOI: 10.1021/jo801443d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Gustavo Moura-Letts
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| |
Collapse
|
24
|
Pacheco MC, Purser S, Gouverneur V. The chemistry of propargylic and allylic fluorides. Chem Rev 2008; 108:1943-81. [PMID: 18543877 DOI: 10.1021/cr068410e] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M Carmen Pacheco
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK
| | | | | |
Collapse
|
25
|
Synthesis of C-disaccharides via a hetero-Diels–Alder reaction and further stereocontrolled transformations. Carbohydr Res 2008; 343:1754-65. [DOI: 10.1016/j.carres.2008.03.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2008] [Revised: 03/05/2008] [Accepted: 03/09/2008] [Indexed: 11/17/2022]
|
26
|
Quan W, Yu B, Zhang J, Liang Q, She X, Pan X. Facile total synthesis of the (−)-Heliconol A. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.07.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
27
|
Chakraborty TK, Goswami RK. Studies directed towards the total synthesis of botcinic acid, the revised structure of botcinolide: synthesis of the highly substituted tetrahydropyran moiety. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.068] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
28
|
McGarvey GJ, Kimura M, Oh T, Williams JM. Acyclic Stereoselective Synthesis of Carbohydrates. J Carbohydr Chem 2006. [DOI: 10.1080/07328308408058813] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
29
|
Kawashima E, Sekine T, Umabe K, Naito Y, Kamaike K, Kojima C, Mizukoshi T, Suzuki EI, Ishido Y. Synthesis of 2′-Deoxy[5′-13C]Ribonucleotides and HMQC-Noesy NMR Study of the Dickerson's Dodecamer with13C-Labeling at the 5′ Positions. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/07328319908044794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
30
|
Oldendorf J, Haufe G. Synthesis of Both Enantiomers of Diastereomeric 4-Fluoro-4,5-Dihydroceramides. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600456] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
31
|
Abstract
[structure: see text] The C5-C10 relative stereochemistry of sagittamide A was predicted, with the use of the 3JH,H profiles assembled from the spin-coupling constants reported in the literature. The predicted relative stereochemistry was then confirmed by a total synthesis of two relevant remote diastereomers. The absolute configuration of sagittamide A was established through a detailed 1H NMR analysis of the two remote diastereomers, followed by doping experiments of them with the authentic natural product.
Collapse
Affiliation(s)
- Hirofumi Seike
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
| | | | | |
Collapse
|
32
|
Nising CF, Ohnemüller UK, Friedrich A, Lesch B, Steiner J, Schnöckel H, Nieger M, Bräse S. Diastereoselective Synthesis of Highly Functionalized Tetrahydroxanthenols—Unprecedented Access to Privileged Structural Motifs. Chemistry 2006; 12:3647-54. [PMID: 16502456 DOI: 10.1002/chem.200501485] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Tetrahydroxanthenones, which can be easily prepared by a domino oxa-Michael aldol condensation, offer various possibilities for diastereoselective functionalization, giving access to the stereocontrolled synthesis of stereochemical triades or tetrades, which represent privileged structural motifs. In most cases, the relative stereochemistry was unequivocally established by crystal structure analysis.
Collapse
Affiliation(s)
- Carl F Nising
- Institut für Organische Chemie, Universität Karlsruhe TH, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Fürstner A, Wuchrer M. Concise Approach to the “Higher Sugar” Core of the Nucleoside Antibiotic Hikizimycin. Chemistry 2006; 12:76-89. [PMID: 16196060 DOI: 10.1002/chem.200500791] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A highly productive synthesis of phenylthio glycoside 33 is described which constitutes a fully functional surrogate for the hikosamine core of hikizimycin 1, a complex nucleoside antibiotic endowed with promising anthelmintic properties. The chosen approach to this undecose derivative starts from mannofuranose 7 which was one-carbon homologated to alkyne 8 in one step on treatment with lithio (trimethylsilyl)diazomethane. Alkynyl iodide 12 derived from 8 was combined with the tartrate-derived aldehyde 17 by a Nozaki-Hiyama-Kishi reaction that can either be performed using overstoichiometric amounts of CrCl2 or by means of a catalytic manifold based on the turnover of a cat. CrCl2/chlorosilane/manganese redox couple. Semi-hydrogenation of the resulting alkyne 18 to (Z)-olefin 19 required the use of Pd/C as the catalyst, whereas conventional Lindlar reduction was unsatisfactory. Attempted cis-dihydroxylation of alkene 22 (formed from 19 by a Mitsunobu reaction with phthalimide) by using catalytic amounts of OsO4 and NMO as the stoichiometric oxidant essentially failed, whereas a stoichiometric osmylation afforded the stable osmate ester 26 a as a single diastereomer. Since the use of OsO4 in stoichiometric amounts deemed inappropriate for a total synthesis project, recourse was taken to catalytic "Blitz dihydroxylation" with RuO4 in the presence of FeCl2.4H2O as co-catalyst. Application of these conditions to alkene 30 bearing a free aldehyde function at the terminus of the "higher sugar" chain furnished pyranose 32 in good yield and excellent diastereoselectivity, which was converted into the targeted thioglycoside 33 on treatment with PhSSPh/Et3P. It is particularly noteworthy that the conformational constraints of the acyclic substrate 30 enforce the dihydroxylation to violate Kishi's empirical rule for transformations of this type.
Collapse
Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany.
| | | |
Collapse
|
34
|
Ermolenko L, Sasaki NA. Diastereoselective Synthesis of All Eight l-Hexoses from l-Ascorbic Acid. J Org Chem 2005; 71:693-703. [PMID: 16408982 DOI: 10.1021/jo0521192] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A novel versatile method for the synthesis of all eight diastereomerically pure L-hexoses was developed. L-Ascorbic acid was converted to two diastereomers A. These alpha-hydroxy esters were transformed into four gamma-alkoxy-alpha,beta-unsaturated esters C via the intermediates B and subsequent Wittig olefination reactions. Each one of compounds C was subjected to dihydroxylation to provide a set of two diols D. Anti/syn-differentiation in diol formation was manipulated by using (DHQD)2PHAL and (DHQ)2PHAL as chiral ligands. Further two-step reaction sequence affords all eight diastereopure L-hexoses.
Collapse
Affiliation(s)
- Ludmila Ermolenko
- Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | | |
Collapse
|
35
|
Abstract
[Reaction: see text]. Two efficient routes to the C1-C22 subunit of halichondrin B are described. The cage ketal 7, which contains 11 asymmetric centers embedded within the ABCDEF-ring framework, was assembled from (+)-conduritol E (27) in 18 steps and 4% overall yield. In a separate route, 7 was also synthesized in 18 steps and 2% overall yield from a derivative of alpha-d-glucoheptonic acid gamma-lactone (62). While the former route installs the fully elaborated C-ring endowed with the correct C12 stereochemistry early in the synthesis, the latter features a late-stage introduction of the C12 stereocenter during the ultimate one-pot Michael addition/ketalization cascade to form the CDE-ring system of the cage. The importance of the C12 stereocenter to the crucial ketalization event is discussed through comparison of these two strategies.
Collapse
Affiliation(s)
- William T Lambert
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
| | | | | | | |
Collapse
|
36
|
Trost BM, Wrobleski ST, Chisholm JD, Harrington PE, Jung M. Total Synthesis of (+)-Amphidinolide A. Assembly of the Fragments. J Am Chem Soc 2005; 127:13589-97. [PMID: 16190724 DOI: 10.1021/ja0533646] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The structure elucidation of (+)-amphidinolide A, a cytotoxic macrolide, has been accomplished by employing a combination of total synthesis and NMR spectroscopic analysis. Amphidinolide A possesses two skipped 1,4-diene subunits which are accessible by ruthenium-catalyzed alkene-alkyne couplings. Previous total syntheses had revealed that the reported structure was incorrect; therefore, to incorporate maximum flexibility into the synthesis, with the ultimate goal of determining the correct structure, a highly convergent approach was chosen. Furthermore, liberal use was made of catalytic asymmetric transformations to set individual stereocenters. Three different strategies were envisioned for the end game, and due to the highly convergent nature of the synthesis, all three routes disconnect to the same three key intermediates, 5, 6, and 7. Diastereomers of 6 and 7 were easily prepared by modification of the synthetic routes to allow access to multiple diastereomers of 1 for structural determination.
Collapse
Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
| | | | | | | | | |
Collapse
|
37
|
Glänzer BI, Györgydeák Z, Bernet B, Vasella A. Analogues of Sialic Acids as Potential Sialidase Inhibitors. Synthesis of C6and C7Analogues ofN-Acetyl-6-amino-2,6-dideoxyneuraminic Acid. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19910740214] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
38
|
Higashibayashi S, Czechtizky W, Kobayashi Y, Kishi Y. Universal NMR Databases for Contiguous Polyols. J Am Chem Soc 2003; 125:14379-93. [PMID: 14624586 DOI: 10.1021/ja0375481] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On the basis of 1,2,3-triols 1a approximately d, 1,2,3,4-tetraols 2a approximately h, and 1,2,3,4,5-pentaols 3a approximately p, NMR databases with four types of profile-descriptors ((13)C-, (1)H-, and (1)H(OH)-chemical shifts and vicinal spin-coupling constants) for contiguous polyols are reported. To systematically assess the relative values of these databases, a case study has been conducted on heptaols 4a approximately d, through which the gamma- and delta-effects have been recognized to refine the (13)C and (1)H chemical shift profile predicted via an application of the concept of self-contained nature. The magnitudes of gamma- and delta-effects depend on a specific stereochemical arrangement of the functional groups present in both the inside and outside of a self-contained box and are significant only for the stereoisomers belonging to a specific sub-group. With the exception of the stereochemical arrangement of functional groups belonging to a specific sub-group, the gamma- and delta-effects can, at the first order of approximation, be ignored for the stereochemical analysis of unknown compounds. For the stereoisomers belonging to a specific sub-group, it is necessary to refine, with incorporation of the gamma- and delta-effects, the profile predicted at the first order of approximation. With use of heptaols 4a approximately d, the values of (3)J(H,H) profiles have been assessed. Two methods, one using profiles consisting of three contiguous (3)J(H,H) constants and the other using profiles consisting of two contiguous (3)J(H,H) constants, have been developed. A stereochemical analysis based on three, or two, contiguous (3)J(H,H) profiles is operationally simpler than one based on (13)C and (1)H chemical shift profiles. Therefore, it is recommended to use a (3)J(H,H) profile as the primary device to predict the stereochemistry of unknown polyols and (13)C and (1)H chemical shift profiles as the secondary devices to confirm the predicted stereochemistry.
Collapse
Affiliation(s)
- Shuhei Higashibayashi
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
| | | | | | | |
Collapse
|
39
|
Lambert WT, Burke SD. Halichondrin B: synthesis of a C1-C14 model via desymmetrization of (+)-conduritol E. Org Lett 2003; 5:515-8. [PMID: 12583757 DOI: 10.1021/ol027389a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A model C1-C14 segment (1) of halichondrin B was synthesized from (+)-conduritol E (7) in 18 steps and 2.9% overall yield. Key features of the synthesis include the novel ozonolytic desymmetrization of C(2)-symmetric diol 6, the early-stage construction of the C-ring which accompanies installation of the crucial C12 stereocenter, and the use of an enol ether C14-ketone surrogate as a precursor to the CDE-"caged" ketal.
Collapse
Affiliation(s)
- William T Lambert
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
| | | |
Collapse
|
40
|
|
41
|
Abstract
The first total synthesis of a naturally occurring siderophore antibiotic, desferrisalmycin B, is described, and the configuration of the unknown stereocenter is assigned. The synthesis features a synthetic strategy of constructing the novel amino-heptopyranoside component by stereoselective dihydroxylation followed by a Bose-modified Mitsunobu reaction. Through this convergent approach, other members of salmycins should also be synthetically accessible.
Collapse
Affiliation(s)
- Li Dong
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, IN 46556-5670, USA
| | | | | |
Collapse
|
42
|
Donohoe TJ, Blades K, Moore PR, Waring MJ, Winter JJG, Helliwell M, Newcombe NJ, Stemp G. Directed dihydroxylation of cyclic allylic alcohols and trichloroacetamides using OsO4/TMEDA. J Org Chem 2002; 67:7946-56. [PMID: 12423122 DOI: 10.1021/jo026161y] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxidation of a range of cyclic allylic alcohols and amides with OsO4/TMEDA is presented. Under these conditions, hydrogen bonding control leads to the (contrasteric) formation of the syn isomer in almost every example that was examined. Evidence for the bidentate binding of TMEDA to OsO4 is presented and a plausible mechanism described.
Collapse
|
43
|
|
44
|
Cox C, Danishefsky SJ. Concise synthesis of a lactonamycin model system by diastereoselective dihydroxylation of a highly functionalized naphthoquinone. Org Lett 2001; 3:2899-902. [PMID: 11529785 DOI: 10.1021/ol016361g] [Citation(s) in RCA: 27] [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
[reaction: see text]. In this Letter, we describe an approach to the highly functionalized tetracycle 6, a model compound corresponding to the CDEF ring system contained in the recently discovered antibiotic lactonamycin. Our approach features an unprecedented, highly stereoselective dihydroxylation of quinone 13a, which leads directly to spirocyclic lactone 15, following acid-promoted deprotection/cyclization. The methodology described herein paves the way for a concise, highly diastereo- and enantioselective synthesis of the natural product.
Collapse
Affiliation(s)
- C Cox
- Department of Chemistry, Columbia University, Havemeyer Hall, New York, New York 10027, USA
| | | |
Collapse
|
45
|
Razavi H, Polt R. Asymmetric syntheses of (-)-8-epi-swainsonine triacetate and (+)-1, 2-Di-epi-swainsonine. Carbonyl addition thwarted by an unprecedented aza-pinacol rearrangement. J Org Chem 2000; 65:5693-706. [PMID: 10970313 DOI: 10.1021/jo000527u] [Citation(s) in RCA: 44] [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
Indolizidines (-)-8-epi-swainsonine triacetate and (+)-1, 2-di-epi-swainsonine were synthesized from the O'Donnell Schiff base ester 1 derived from D-serine. Reductive-alkenylation of 1 with (i)()Bu(5)Al(2)H/H(2)C=CHMgBr followed by substrate-directed dihydroxylation of the pendant allylic group with OsO(4), reduction of imine, and cyclization with Ph(3)P/CCl(4) gave the polyhydroxylated pyrrolidines 8a and 8b as advanced intermediates. Efficient protecting group manipulations converted pyrrolidines 8a and 8b to their corresponding partially protected analogues 10a and 10b, which upon Swern oxidation and diastereoselective Keck-type allylation with BF(3).Et(2)O afforded the required three-carbon homologues (10a, >20:1 de; 10b, 3.5:1 de). Use of the chelating Lewis acid MgBr(2) instead of BF(3).Et(2)O with 10a led to a novel aza-pinacol rearrangement and allylation at the alpha-carbon to yield amino alcohol 17, which is similar to a hydride migration in the biosynthetic pathway of indolizidine alkaloids. Subsequent hydroboration, cyclization, and deprotection furnished (-)-8-epi-swainsonine triacetate 15a and (+)-1,2-di-epi-swainsonine 16b in good overall yields (6.3% for 1 --> 15a, 13 steps, and 4.0% for 1 --> 16b, 14 steps).
Collapse
Affiliation(s)
- H Razavi
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721, USA
| | | |
Collapse
|
46
|
St-Denis Y, Chan TH. Synthesis of 8-epi-castanospermine and 6,7,8-tri-epi-castanospermine. CAN J CHEM 2000. [DOI: 10.1139/v00-043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
8-epi-Castanospermine (11) and 6,7,8-tri-epi-castanospermine (12) were synthesized from the hydroxyproline precursor 13 which was obtained enantioselectively via an enzymatic process.Key words: castanospermine, synthesis of, enzymatic reduction, enzymatic resolution, asymmetric synthesis.
Collapse
|
47
|
Donohoe TJ, Blades K, Helliwell M, Moore PR, Winter JJG, Stemp G. Directed Dihydroxylation of Allylic Trichloroacetamides. J Org Chem 1999; 64:2980-2981. [PMID: 11674383 DOI: 10.1021/jo982468e] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy J. Donohoe
- SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Third Avenue, Harlow, Essex CM19 5AW, U.K
| | | | | | | | | | | |
Collapse
|
48
|
Imashiro R, Sakurai O, Yamashita T, Horikawa H. A short and efficient synthesis of phytosphingosines using asymmetric dihydroxylation. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00615-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
49
|
Sharma G, Hymavathi L, Krishna PR. Carbon — carbon linked disaccharides by de novo construction from furanyl sugar templates. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01624-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
50
|
Wade PA, D'Ambrosio SG, Rao JA, Shah-Patel S, Cole DT, Murray, JK, Carroll PJ. Synthesis ofl-Daunosamine Derivatives on the Basis of the Asymmetric Dihydroxylation of 3-((E)-1-Propenyl)-4,5-dihydroisoxazole. J Org Chem 1997. [DOI: 10.1021/jo962293d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|