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Würges K, Mackfeld U, Pohl M, Lütz S, Wilhelm S, Wiechert W, Kubitzki T. An Efficient Route to Both Enantiomers of allo-Threonine by Simultaneous Amino Acid Racemase-Catalyzed Isomerization of Threonine and Crystallization. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2
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Zeng CM, Kerrigan SA, Katzenellenbogen JA, Slocum C, Gallacher K, Shomali M, Lyttle CR, Hattersley G, Miller CP. Efficient synthesis of (2R,3S)-2-amino-3-(benzyloxy)-4,4,4-trifluorobutanoic acid (4,4,4-trifluoro-OBn-d-allothreonine). Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.147] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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3
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Morris WJ, Shair MD. Synthesis of the N-(tert-butyloxycarbonyl)-O-triisopropylsilyl-D-pyrrolosamine Glycal of Lomaiviticin A & B via Epimerization of L-Threonine. Tetrahedron Lett 2010; 51:4310-4312. [PMID: 20802782 PMCID: PMC2926667 DOI: 10.1016/j.tetlet.2010.06.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient synthesis of the N-(tert-butyloxycarbonyl)-O-triisopropylsilyl-D-pyrrolosamine glycal of lomaiviticin A (1) and lomaiviticin B (2) is described. The synthesis is highlighted by the epimerization of the L-threonine-derived oxazolidine 10 to oxazolidine 11. This key epimerization reaction, which serves to establish the correct relative configuration of the carbohydrate unit, was made possible only after conformational analysis indicated that substituted oxazolidines may adopt conformations that preclude enolization.
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Affiliation(s)
- William J. Morris
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street Cambridge, MA 02138
| | - Matthew D. Shair
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street Cambridge, MA 02138
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Walker S, Chen L, Hu Y, Rew Y, Shin D, Boger DL. Chemistry and Biology of Ramoplanin: A Lipoglycodepsipeptide with Potent Antibiotic Activity. Chem Rev 2005; 105:449-76. [PMID: 15700952 DOI: 10.1021/cr030106n] [Citation(s) in RCA: 108] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suzanne Walker
- The Department of Microbiology & Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.
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Jiang ZX, Qin YY, Qing FL. Asymmetric synthesis of both enantiomers of anti-4,4,4-trifluorothreonine and 2-amino-4,4,4-trifluorobutanoic acid. J Org Chem 2003; 68:7544-7. [PMID: 12968918 DOI: 10.1021/jo0344384] [Citation(s) in RCA: 42] [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
A short and efficient enantioselective synthesis of both enantiomers of anti-4,4,4-trifluorothreonine and 2-amino-4,4,4-trifluorobutanoic acid was successfully developed. Trifluoromethylation of benzyl-protected bromoalkene 4 provided key intermediate trifluoromethylated trans-disubstituted alkene 2 in good yield. The sequence then involved Sharpless asymmetric dihydroxylation, nucleophilic opening of cyclic sulfate with NaN(3), palladium-catalyzed selective hydrogenation, and oxidation.
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Affiliation(s)
- Zhong-Xing Jiang
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, 354 Fenglin Lu, Shanghai 200032, China
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6
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Jiang W, Wanner J, Lee RJ, Bounaud PY, Boger DL. Total synthesis of the ramoplanin A2 and ramoplanose aglycon. J Am Chem Soc 2003; 125:1877-87. [PMID: 12580615 DOI: 10.1021/ja0212314] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Full details of a convergent total synthesis of the ramoplanin A2 and ramoplanose aglycon are disclosed. Three key subunits composed of residues 3-9 (heptapeptide 15), pentadepsipeptide 26 (residues 1, 2 and 15-17), and pentapeptide 34 (residues 10-14) were prepared, sequentially coupled, and cyclized to provide the 49-membered depsipeptide core of the aglycon. Key to the preparation of the pentadepsipeptide 26 incorporating the backbone ester was the asymmetric synthesis of an orthogonally protected l-threo-beta-hydroxyasparagine and the development of effective and near-racemization free conditions for esterification of its hindered alcohol (EDCI, DMAP, 0 degrees C). The coupling sites were chosen to maximize the convergency of the synthesis including that of the three subunits, to prevent late stage racemization of carboxylate-activated phenylglycine-derived residues, and to enlist beta-sheet preorganization of an acyclic macrocyclization substrate for 49-membered ring closure. By altering the order of final couplings, two macrocyclization sites, Phe(9)-d-Orn(10) and Gly(14)-Leu(15), were examined. Macrocyclization at the highly successful Phe(9)-d-Orn(10) site (89%) may benefit from both beta-sheet preorganization as well as closure at a d-amine terminus within the confines of a beta-turn at the end of the H-bonded antiparallel beta-strands. A more modest, but acceptable macrocyclization reaction at the Gly(14)-Leu(15) site (40-50%) found at the other end of the H-bonded antiparallel beta-strands within a small flexible loop may also benefit from preorganization of the cyclization substrate, is conducted on a substrate incapable of competitive racemization, and accommodates the convergent preparation of analogues bearing depsipeptide modifications. Deliberate late-stage incorporation of the subunit bearing the labile depsipeptide ester and a final stage Asn(1) side-chain introduction provides future access to analogues of the aglycons which themselves are equally potent or more potent than the natural products in antimicrobial assays.
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Affiliation(s)
- Wanlong Jiang
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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7
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Wills AJ, Krishnan-Ghosh Y, Balasubramanian S. Synthesis of a polymer-supported oxazolidine aldehyde for asymmetric chemistry. J Org Chem 2002; 67:6646-52. [PMID: 12227793 DOI: 10.1021/jo0203239] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An expedient synthesis of the polymer-supported aldehyde 3, as a Garner aldehyde equivalent, is described. Oxazolidine 3 may be obtained through preformation of aldehyde linker 4 in solution and loaded onto amine-terminating resin under peptide-coupling conditions, or alternatively via oxidation of polymer-bound alcohol 14. The integrity of the serine-derived stereocenter is maintained through all steps of the synthesis.
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Affiliation(s)
- A Jonathan Wills
- University Chemistry Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Jiang W, Wanner J, Lee RJ, Bounaud PY, Boger DL. Total synthesis of the ramoplanin A2 and ramoplanose aglycon. J Am Chem Soc 2002; 124:5288-90. [PMID: 11996568 DOI: 10.1021/ja020237q] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convergent total synthesis of the ramoplanin A2 and ramoplanose aglycon is disclosed. Three key subunits composed of residues 3-9 (heptapeptide 15), pentadepsipeptide 26, and pentapeptide 34 (residues 10-14) were prepared, sequentially coupled, and cyclized to provide the 49-membered depsipeptide core of the aglycon. Key to the preparation of the pentadepsipeptide 26 incorporating the backbone ester was the asymmetric synthesis of an orthogonally protected L-threo-beta-hydroxyasparagine and the development of effective and near-racemization free conditions for esterification of its hindered alcohol (EDCI, DMAP, 0 degrees C). The coupling sites were chosen to maximize the convergency of the synthesis including that of the three subunits, to prevent late stage racemization of carboxylate-activated phenylglycine-derived residues, and to enlist beta-sheet preorganization of an acyclic macrocyclization substrate for 49-membered ring closure. As such, macrocyclization at the chosen Phe(9)-D-Orn(10) site may benefit from both beta-sheet preorganization as well as closure at a D-amine terminus. Deliberate late stage incorporation of the subunit bearing the labile depsipeptide ester and a final stage Asn(1) side chain introduction provides future access to analogues of the aglycons which themselves are reported to be equally potent or more potent than the natural products in antimicrobial assays.
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Affiliation(s)
- Wanlong Jiang
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92037, USA
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10
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Merino P, Lanaspa A, Merchan FL, Tejero T. Totally stereocontrolled synthesis of α,β-diamino acids by addition of Grignard reagents to nitrones derived from l -serine. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00004-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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11
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Lloyd-Williams P, Sánchez A, Carulla N, Ochoa T, Giralt E. Synthetic studies on threonines. The preparation of protected derivatives of d-allo- and l-allo-threonine for peptide synthesis. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00059-8] [Citation(s) in RCA: 5] [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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12
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Kelly NM, Sutherland A, Willis CL. Syntheses of amino acids incorporating stable isotopes. Nat Prod Rep 1997. [DOI: 10.1039/np9971400205] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Lloyd-Williams P, Carulla N, Giralt E. Simple methods for the preparation of protected derivatives of and. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(96)02297-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Williams L, Zhang Z, Feng Shao, Carroll PJ, Joullié MM. Grignard reactions to chiral oxazolidine aldehydes. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00672-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Dell'Uomo N, Di Giovanni MC, Misiti D, Zappia G, Monache GD. A Stereoselective Synthesis ofthreo-3-Hydroxyglutamic Acid. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/jlac.199419940618] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Katsumura S, Yamamoto N, Morita M, Han Q. Diastereoselective synthesis of γ-hydroxy-β-amino alcohols, (2S, 3S)- and (2S, 3R)-threoninol and -hydroxyphenylalaninol, from (R)-glycidol via the derived 4-hydroxymethyloxazolidinone. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0957-4166(00)86162-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Blank S, Seebach D. Herstellung von (R,R)- oder (S,S)-2-Amino-3-hydroxycarbonsäuren (allo-Threonin-Analoge) durch Acylierung/Reduktion von 2-t-Butyl-3-methyl-4-oxoimidazolidin-1-carbonsäure-t-butylester (Boc-BMI). ACTA ACUST UNITED AC 1993. [DOI: 10.1002/jlac.1993199301140] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ishizuka T, Kimura K, Ishibuchi S, Kunieda T. Practical Preparation of Chiral 4-Substituted 2-Oxazolidinones. CHEM LETT 1992. [DOI: 10.1246/cl.1992.991] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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