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Evans DA, Beiger JJ, Burch JD, Fuller PH, Glorius F, Kattnig E, Thaisrivongs DA, Trenkle WC, Young JM, Zhang J. Total Synthesis of Aflastatin A. J Am Chem Soc 2022; 144:19953-19972. [PMID: 36269121 DOI: 10.1021/jacs.2c08244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The total syntheses of aflastatin A and its C3-C48 degradation fragment (6a, R = H) have been accomplished. The syntheses feature several complex diastereoselective fragment couplings, including a Felkin-selective trityl-catalyzed Mukaiyama aldol reaction, a chelate-controlled aldol reaction involving soft enolization with magnesium, and an anti-Felkin-selective boron-mediated oxygenated aldol reaction. Careful comparison of the spectroscopic data for the synthetic C3-C48 degradation fragment to that reported by the isolation group revealed a structural misassignment in the lactol region of the naturally derived degradation product. Ultimately, the data reported for the naturally derived aflastatin A C3-C48 degradation lactol (6a, R = H) were attributed to its derivative lactol trideuteriomethyl ether (6c, R = CD3). Additionally, the revised absolute configurations of six stereogenic centers (C8, C9, and C28-C31) were confirmed.
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Affiliation(s)
- David A Evans
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jason J Beiger
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jason D Burch
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Peter H Fuller
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Frank Glorius
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Egmont Kattnig
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - David A Thaisrivongs
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - William C Trenkle
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Joseph M Young
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jing Zhang
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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Shinde MH, Kona CN, Ramana CV. Synthesis of central spiro-bis-THF fragments of symbiospirols A–C. NEW J CHEM 2022. [DOI: 10.1039/d2nj02227c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four diastereomeric spiro-bis-THF derivatives representing the central C22–C33 and C36–C47 fragments of symbiospirols A–C have been synthesized in an attempt to establish the relative stereochemistry of these fragments.
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Affiliation(s)
- Mahesh H. Shinde
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr Homi Bhabha, Road, Pune 411 008, India
| | - Chandrababu N. Kona
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr Homi Bhabha, Road, Pune 411 008, India
| | - Chepuri V. Ramana
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr Homi Bhabha, Road, Pune 411 008, India
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Murakoshi S, Hosokawa S. Synthesis of C3-C21 Segment of Aflastatin A Using Remote Asymmetric Induction Reactions. Org Lett 2019; 21:758-761. [PMID: 30632762 DOI: 10.1021/acs.orglett.8b04008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The C3-C21 segment of aflastatin A has been synthesized by converging three segments including the C3-C8 segment, the C9-C15 segment, and the C16-C21 segment. Each segment has been synthesized from a vinylketene silyl N,O-acetal possessing a chiral auxiliary by a wide-range stereocontrol strategy. The C3-C8 segment was constructed in seven steps including the stereoselective vinylogous Mukaiyama alkylation, while the C9-C15 segment and the C16-C21 segment were synthesized using the vinylogous Mukaiyama aldol reaction in seven and eight steps, respectively.
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Affiliation(s)
- Sawato Murakoshi
- Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , 3-4-1 Ohkubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Seijiro Hosokawa
- Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , 3-4-1 Ohkubo , Shinjuku-ku, Tokyo 169-8555 , Japan
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2013-2014. MASS SPECTROMETRY REVIEWS 2018; 37:353-491. [PMID: 29687922 DOI: 10.1002/mas.21530] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 11/29/2016] [Indexed: 06/08/2023]
Abstract
This review is the eighth update of the original article published in 1999 on the application of Matrix-assisted laser desorption/ionization mass spectrometry (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2014. Topics covered in the first part of the review include general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation, and arrays. The second part of the review is devoted to applications to various structural types such as oligo- and poly- saccharides, glycoproteins, glycolipids, glycosides, and biopharmaceuticals. Much of this material is presented in tabular form. The third part of the review covers medical and industrial applications of the technique, studies of enzyme reactions, and applications to chemical synthesis. © 2018 Wiley Periodicals, Inc. Mass Spec Rev 37:353-491, 2018.
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Affiliation(s)
- David J Harvey
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7FZ, United Kingdom
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Tikad A, Delbrouck JA, Vincent SP. Debenzylative Cycloetherification: An Overlooked Key Strategy for Complex Tetrahydrofuran Synthesis. Chemistry 2016; 22:9456-76. [DOI: 10.1002/chem.201600655] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 01/22/2023]
Affiliation(s)
- Abdellatif Tikad
- University of Namur (UNamur); Département de Chimie; Laboratoire de Chimie Bio-Organique; rue de Bruxelles 61 5000 Namur Belgium
| | - Julien A. Delbrouck
- University of Namur (UNamur); Département de Chimie; Laboratoire de Chimie Bio-Organique; rue de Bruxelles 61 5000 Namur Belgium
| | - Stéphane P. Vincent
- University of Namur (UNamur); Département de Chimie; Laboratoire de Chimie Bio-Organique; rue de Bruxelles 61 5000 Namur Belgium
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Godin F, Duplessis M, Buonomano C, Trinh T, Houde K, Chapdelaine D, Rodrigue J, Boutros A, Guindon Y. Stereocontrolled synthesis of propionate motifs froml-lactic andl-alanine aldehydes. A DFT study of the hydrogen transfer under endocyclic control. Org Chem Front 2014. [DOI: 10.1039/c4qo00142g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Narute SB, Rout JK, Ramana CV. Synthesis ofC-Disaccharides through a One-Pot Alkynol Cycloisomerization-Reductive Deoxygenation. Chemistry 2013; 19:15109-14. [DOI: 10.1002/chem.201302252] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 01/28/2023]
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