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Bhamboo P, Bera S, Mondal D. TiCl
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‐Promoted Asymmetric Aldol Reaction of Oxazolidinones and its Sulphur‐Congeners for Natural Product Synthesis. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Prateek Bhamboo
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Smritilekha Bera
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Dhananjoy Mondal
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
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2
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An unexpected effect of acetal stereochemistry on the course of its reductive cleavage. Tetrahedron Lett 2016; 57:3254-3255. [DOI: 10.1016/j.tetlet.2016.06.067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Pfeiffer B, Speck-Gisler S, Barandun L, Senft U, de Groot C, Lehmann I, Ganci W, Gertsch J, Altmann KH. Total Synthesis and Configurational Assignment of the Marine Natural Product Haliclamide. J Org Chem 2013; 78:2553-63. [DOI: 10.1021/jo3027643] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Bernhard Pfeiffer
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Sandra Speck-Gisler
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Luzi Barandun
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Ursula Senft
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Claire de Groot
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Irène Lehmann
- Institute of Organic Chemistry,
Laboratory for Process Research, University of Zürich, Wintherthurerstr. 190, CH-8057 Zürich, Switzerland
| | - Walter Ganci
- Institute of Organic Chemistry,
Laboratory for Process Research, University of Zürich, Wintherthurerstr. 190, CH-8057 Zürich, Switzerland
| | - Jürg Gertsch
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
| | - Karl-Heinz Altmann
- Department of Chemistry and
Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, HCI H405, Wolfgang-Pauli Str. 10,
CH-8093 Zürich, Switzerland
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Chatterjee B, Mondal D, Bera S. Asymmetric synthesis of a 12-membered macrolactone core and a 6-epi analogue of amphidinolide W from 4-pentenoic acid. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.07.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Srinivasarao M, Kim Y, Li XH, Robbins DW, Fuchs PL. Studies on the Synthesis of Apoptolidin: Synthesis of a C1–C27 Fragment of Apoptolidin D. J Org Chem 2011; 76:7834-41. [PMID: 21827193 DOI: 10.1021/jo200934w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Madduri Srinivasarao
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Youngsoon Kim
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Xiaojin Harry Li
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Daniel W. Robbins
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Philip L. Fuchs
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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Abstract
A highly convergent, enantioselective total synthesis of the potent antitumor agent apoptolidin A has been completed. The key transformations include highly selective glycosylations to attach the C27 disaccharide and the C9 6'-deoxy-l-glucose, a cross-metathesis to incorporate the C1-C10 trienoate unit, and a Yamaguchi macrolactonization to complete the macrocycle. Twelve stereocenters in the polypropionate segments and sugar units were established through diastereoselective chlorotitanium enolate aldol reactions.
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Affiliation(s)
- Michael T Crimmins
- Venable and Kenan Laboratories of Chemistry, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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Ghidu VP, Wang J, Wu B, Liu Q, Jacobs A, Marnett LJ, Sulikowski GA. Synthesis and evaluation of the cytotoxicity of apoptolidinones A and D. J Org Chem 2008; 73:4949-55. [PMID: 18543990 PMCID: PMC2572754 DOI: 10.1021/jo800545r] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2008] [Indexed: 11/28/2022]
Abstract
Apoptolidins A-D are microbial secondary metabolites shown to be selectively cytotoxic against several cancer cell lines and noncytotoxic against normal cells. Total syntheses of apoptolidinones A and D are reported. The efficient synthetic strategy leading to the apoptolidinones features construction of the common 20-membered macrolactone by an intramolecular Suzuki reaction and stereocontrolled aldol reactions establishing the C19/C20 and C22/C23 stereocenters. In contrast to apoptolidin A, the aglycones apoptolidinone A and D were shown to be noncytotoxic when evaluated against human lung cancer cells (H292).
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Affiliation(s)
- Victor P Ghidu
- Department of Chemistry, Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822, USA
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Abstract
At low temperature and in the presence of an acid catalyst, SO2 adds to 1,3-dienes equilibrating with the corresponding 3,6-dihydro-1,2-oxathiin-2-oxides (sultines). These compounds are unstable above -60 °C and equilibrate with the more stable 2,5-dihydrothiophene 1,1-dioxides (sulfolenes). The hetero-Diels-Alder additions of SO2 are suprafacial and follow the Alder endo rule. The sultines derived from 1-oxy-substituted and 1,3-dioxy-disubstituted 1,3-dienes cannot be observed at -100 °C but are believed to be formed faster than the corresponding sulfolenes. In the presence of acid catalysts, the 6-oxy-substituted sultines equilibrate with zwitterionic species that react with electron-rich alkenes such as enoxysilanes and allylsilanes, generating β,γ-unsaturated silyl sulfinates that can be desilylated and desulfinylated to generate polypropionate fragments containing up to three contiguous stereogenic centers and an (E)-alkene unit. Alternatively, the silyl sulfinates can be reacted with electrophiles to generate polyfunctional sulfones (one-pot, four-component synthesis of sulfones), or oxidized into sulfonyl chlorides and reacted with amines, then realizing a one-pot, four-component synthesis of polyfunctional sulfonamides. Using enantiomerically enriched dienes such as 1-[(R)- or 1-(S)-phenylethyloxy]-2-methyl-(E,E)-penta-1,3-dien-3-yl isobutyrate, derived from inexpensive (R)- or (S)-1-phenylethanol, enantiomerically enriched stereotriads are obtained in one-pot operations. The latter are ready for further chain elongation. This has permitted the development of expeditious total asymmetric syntheses of important natural products of biological interest such as the baconipyrones, rifamycin S, and apoptolidin A.
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Craita C, Didier C, Vogel P. Short synthesis of the C16-C28 polyketide fragment of apoptolidin A aglycone. Chem Commun (Camb) 2007:2411-3. [PMID: 17844763 DOI: 10.1039/b701293d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Starting from (E,E)-1-[(1R)-(phenylethyl)oxy]-2-methylpenta-1,3-diene and triethylsilyl enol ether of butanone rapid access to Koert's advanced C10-C28 polyketide fragment of apoptolidin A is now possible.
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Affiliation(s)
- Cotinica Craita
- Institute of Pharmaceutical Sciences, ETH Zürich, Wolfgang-Pauli-Strasse 10, CH, 8093 Zürich, Switzerland
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Wehlan H, Dauber M, Fernaud MTM, Schuppan J, Keiper S, Mahrwald R, Garcia MEJ, Koert U. Apoptolidin A: total synthesis and partially glycosylated analogues. Chemistry 2007; 12:7378-97. [PMID: 16865757 DOI: 10.1002/chem.200600462] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The total synthesis of apoptolidin A is described employing an early glycosylation strategy. Strategic disconnections were chosen between C11-C12 (cross-coupling) and C19O-C1 (macrocyclization). The cis-selective glycosylation at C9-OH was achieved with the new SIBA protective group at O2/O3 of the L-glucose residue. Auxiliary substitutents at the 2-position of the 2-deoxy sugars were applied to form selectively the glycosidic linkages of the C27 disaccharide. The cross-coupling of the glycosylated northern half with the glycosylated southern half was achieved with CuI-thiophene carboxylate. The macrocyclization of a trihydroxy carboxylic acid produced the 20-membered macrolide selectively. H2SiF6 was suitable for the final deprotection of the silyl ethers and the conversion of the C21 methylketal into the hemiketal. The synthetic flexibility of the approach was proven by the synthesis of some glycovariants.
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Affiliation(s)
- Hermut Wehlan
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
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Affiliation(s)
- Aurelio Ortiz
- a Centro de investigacíon de la Facultad de Ciencias Químicas de la Benemérita, Universidad Autónoma de Puebla , Puebla Pue., 72570, Mexico
| | - Estibaliz Sansinenea
- b Instituto de Ciencias de la Benemérita, Universidad Autónoma de Puebla , Puebla Pue., 72570, Mexico
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Schuppan J, Wehlan H, Keiper S, Koert U. Apoptolidinone A: Synthesis of the Apoptolidin A Aglycone. Chemistry 2006; 12:7364-77. [PMID: 16865756 DOI: 10.1002/chem.200600461] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An efficient stereocontrolled synthesis of apoptolidinone A, the aglycone of apoptolidin A is described. The synthetic strategy relies on a cross coupling between C11/C12 of a northern half (C1-C11) and a southern part (C12-C28) followed by a ring-size selective macrolactonization. Key steps for the introduction of the southern half stereocenters are a stereoselective aldol reaction, a substrate controlled dihydroxylation and a chelation-controlled Grignard/aldehyde addition. The conjugated triene of the northern half was built up successively by E-selective Wittig reactions. L-Malic acid was chosen as the chiral pool source for the C8/C9 stereocenters. The final cleavage of the silyl ethers and the conversion of the C21 methyl ketal into the hemiketal was achieved by HF.pyridine.
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Affiliation(s)
- Julia Schuppan
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
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Wender PA, Sukopp M, Longcore K. Apoptolidins B and C: isolation, structure determination, and biological activity. Org Lett 2006; 7:3025-8. [PMID: 15987196 PMCID: PMC2533581 DOI: 10.1021/ol051074o] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Apoptolidin (1) is a promising new therapeutic lead that exhibits remarkable selectivity against cancer cells relative to normal cells. We report the isolation, characterization, solution structure, stability, and biological activity of two new members of this family: apoptolidins B (2) and C (3). These new agents are found to have antiproliferative activity on par with or better than apoptolidin itself in an assay with H292 lung cancer cells.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, California 94305-5080, USA.
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Daniel PT, Koert U, Schuppan J. Apoptolidin: Induction of Apoptosis by a Natural Product. Angew Chem Int Ed Engl 2006; 45:872-93. [PMID: 16404760 DOI: 10.1002/anie.200502698] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Apoptolidin is a natural product that selectively induces apoptosis in several cancer cell lines. Apoptosis, programmed cell death, is a biological key pathway for regulating homeostasis and morphogenesis. Apoptotic misregulations are connected with several diseases, in particular cancer. The extrinsic way to apoptosis leads through death ligands and death receptors to the activiation of the caspase cascade, which results in proteolytic degradation of the cell architecture. The intrinsic pathway transmits signals of internal cellular damage to the mitochondrion, which loses its structural integrity, and forms an apoptosome that initiates the caspase cascade. Compounds which regulate apoptosis are of high medical significance. Many natural products regulate apoptotic pathways, and apoptolidin is one of them. The known synthetic routes to apoptolidin are described and compared in this Review. Selected further natural products which regulate apoptosis are introduced briefly.
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Affiliation(s)
- Peter T Daniel
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Humboldt University of Berlin, Germany
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Daniel PT, Koert U, Schuppan J. Apoptolidin: Induktion von Apoptose durch einen Naturstoff. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502698] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Wu B, Liu Q, Jin B, Qu T, Sulikowski GA. Studies on the Synthesis of Apoptolidin: Progress on the Stereocontrolled Assembly of the Pseudo Aglycone of Apoptolidin. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500632] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Crimmins MT, Christie HS, Chaudhary K, Long A. Enantioselective Synthesis of Apoptolidinone: Exploiting the Versatility of Thiazolidinethione Chiral Auxiliaries. J Am Chem Soc 2005; 127:13810-2. [PMID: 16201800 DOI: 10.1021/ja0549289] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient, enantioselective synthesis of apoptolidinone has been completed, demonstrating the versatility of thiazolidinethione auxiliaries. Three propionate aldol additions and two asymmetric glycolate alkylations function to establish 8 of the 12 stereogenic carbon centers. A cross-metathesis reaction is utilized to assemble the C1-C10 trieneoate fragment and the C11-C28 polypropionate region of the molecule.
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Affiliation(s)
- Michael T Crimmins
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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Abstract
[structure: see text] The de novo synthesis of the C9 and C27 sugar subunits (2) and (3), respectively, of the potent antitumor agent, apoptolidin, has been accomplished. A titanium tetrachloride-mediated asymmetric anti glycolate aldol addition was utilized to establish the 4' and 5' stereogenic centers of each of the three monosaccharides. Elaboration of the aldol adducts efficiently provided the three sugar units. A beta-selective glycosidation completed the construction of the C27 disaccharide.
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Affiliation(s)
- Michael T Crimmins
- Venable and Kenan Laboratories of Chemistry, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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Bouchez LC, Vogel P. Synthesis of the C(1)-C(11) Polyene Fragment of Apoptolidin with a New Sulfur Dioxide-Based Organic Chemistry. Chemistry 2005; 11:4609-20. [PMID: 15954151 DOI: 10.1002/chem.200500165] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A new sulfur dioxide-based organic chemistry has been developed as a novel approach for the stereoselective synthesis of polyene fragments based on our one-pot, four-component synthesis of polyfunctional epsilon-alkanesulfonyl-gamma,delta-unsaturated ketones. The flexibility and efficiency of this methodology are illustrated by the preparation of (+)-methyl (2E,4E,6E,8R,9S)-9-{[(tert-butyl)dimethylsilyl]oxy}-2,4,6,8-tetramethyl-11-(triethylsilyl)undeca-2,4,6-trien-10-ynoate, a synthetic intermediate of Nicolaou and co-workers, that corresponds to the C(1)-C(11) fragment of apoptolidin, which was used by the authors in their total synthesis of this promising anticancer agent.
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Affiliation(s)
- Laure C Bouchez
- Laboratory of Glycochemistry and Asymmetric Synthesis, Swiss Federal Institute of Technology (EPFL), Switzerland
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Development of an end-game strategy towards apoptolidin: a sequential Suzuki coupling approach. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.10.088] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Affiliation(s)
- Bin Wu
- Department of Chemistry, Vanderbilt University, 7920 Stevenson Center, Nashville, TN 37235, USA
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Gustafsson T, Schou M, Almqvist F, Kihlberg J. A Total Synthesis of Hydroxylysine in Protected Form and Investigations of the Reductive Opening of p-Methoxybenzylidene Acetals. J Org Chem 2004; 69:8694-701. [PMID: 15575745 DOI: 10.1021/jo049136w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthesis of (2S,5R)-5-hydoxylysine, based on (R)-malic acid and Williams glycine template as chiral precursors, has been developed. This afforded hydroxylysine, suitably protected for direct use in peptide synthesis, in 32% yield over the 13-step sequence. Regioselective reductive opening of a p-methoxybenzylidene acetal and alkylation of the Williams glycine template were key steps in the synthetic sequence. Surprisingly, the regioselectivity in opening of the p-methoxybenzylidene acetal was reversed as compared to what was expected. It was found that this was due to chelation of the trialkylsilyl choride, used as an electrophile in the reductive opening, to an adjacent azide functionality. It was also discovered that an equivalent amount of trialkylsilyl hydride was formed in the reaction, a finding that led to additional mechanistic insight into reductive openings of p-methoxybenzylidene acetals with sodium cyanoborohydride as reducing agent.
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Affiliation(s)
- Tomas Gustafsson
- Organic Chemistry, Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
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Abe K, Kato K, Arai T, Rahim MA, Sultana I, Matsumura S, Toshima K. Synthetic studies on apoptolidin: synthesis of the C12–C28 fragment via a highly stereoselective aldol reaction. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.177] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wu Y, Shen X, Yang YQ, Hu Q, Huang JH. Enantioselective total synthesis of (+)-brefeldin A and 7-epi-brefeldin A. J Org Chem 2004; 69:3857-65. [PMID: 15153019 DOI: 10.1021/jo049971d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convergent enantioselective route to brefeldin A (BFA) and 7-epi-BFA was developed. The key C-4/C-5 chiral centers were established by using chiral auxiliary induced intermolecular asymmetric aldolization in the presence of TiCl(4) and TMEDA. The results with the thiazolidinethione/TiCl(4) mediated intermolecular asymmetric aldolization added some new information about the scope and limitations to the existing knowledge of that type of reactions (which so far was essentially limited to the reactions with N-propionyl thiazolidinethiones). During the course a method for protecting the liable aldol hydroxyl groups by using inexpensive TBSCl in DMF with 2,6-lutidine as the base was developed to replace the otherwise unavoidable TBSOTf procedure. Due to the excessive steric hindrance, removal of the auxiliary was much more difficult than most literature cases. Cleavage of the oxazolidinone by reduction was almost impossible. The thiazolidinethione auxiliary was relatively easier to remove. However, several reactions reported for facile removal of thiazolidinethione auxiliaries in the literature still failed. Reductive removal of the thiazolidinethione auxiliary was most effectively realized with LiBH(4) in diethyl ether in the presence of 1 equiv of MeOH (a modification of a literature procedure for removal of oxazolidinone auxiliaries in less hindered substrates). Apart from the auxiliary removal, oxidation of the alcohol into aldehyde and the deprotection of the dithiolane protecting group were also rather difficult in the present context. A range of methods were screened before final solutions were found. The five-membered ring was constructed by employing an intramolecular Mukaiyama reaction after many attempts with the intramolecular aldolization under a variety of conditions failed. The rate of elimination of the alkoxyl to form the alpha,beta-double bond of the key intermediate cyclopentenone 49 with DBU was highly solvent dependent (very sluggish in CH(2)Cl(2) but rather fast in MeOH). Introduction of the lower chain (which was synthesized by using a Jacobsen KHR to establish the C-15 chirality) was achieved through a Michael addition similar to the precedents in the literature. It has not been noticed before that the yield of this Michael reaction could be dramatically raised by using 3 equiv of the copper-lithium reagent 55. Reduction of the C-7 carbonyl was apparently more difficult than similar cases in the literature. After examination of many reagents under various conditions, it was found that the best reagent for yielding the alpha-isomer was (S)-2-methyl-CBS-borolidine/BH(3) and that for the beta-isomer was L-Selectride. The alpha- and beta-isomers were then further elaborated into (+)-brefeldin A and 7-epi-BFA, respectively. An unexpected yet very interesting solubility difference between BFA and 7-epi-BFA was also observed.
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Affiliation(s)
- Yikang Wu
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China.
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Wu Y, Shen X, Yang YQ, Hu Q, Huang JH. An aldol approach to the total synthesis of (+)-brefeldin A. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2003.10.130] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Liu B, Zhou WS. Toward the Total Synthesis of Natural Peloruside A: Stereoselective Synthesis of the Backbone of the Core. Org Lett 2003; 6:71-4. [PMID: 14703353 DOI: 10.1021/ol036058a] [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
[reaction: see text] An asymmetric synthesis of the backbone of the core of natural peloruside A is described. Key elements include reiterative application of enantioselective allylation to establish the stereochemistry of the backbone and a double asymmetric aldol reaction to successfully couple two fragments.
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Affiliation(s)
- Bo Liu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, P. R. China
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Abstract
[reaction: see text] A novel approach toward the synthesis of the triene portion of the biologically active polyketide apoptolidin is described. The use of an iterative thionyl chloride rearrangement/oxidation sequence to construct trisubstituted olefins is explored.
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Affiliation(s)
- William D Paquette
- Department of Chemistry & Biochemistry and the Walther Cancer Research Center, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, USA
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Nicolaou KC, Fylaktakidou KC, Monenschein H, Li Y, Weyershausen B, Mitchell HJ, Wei HX, Guntupalli P, Hepworth D, Sugita K. Total Synthesis of Apoptolidin: Construction of Enantiomerically Pure Fragments. J Am Chem Soc 2003; 125:15433-42. [PMID: 14664589 DOI: 10.1021/ja0304953] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A general strategy for the total synthesis of the antitumor agent apoptolidin (1) is proposed, and the chemical synthesis of the defined key building blocks (4, 5, 6, 8, and 9) in their enantiomerically pure forms is described. The projected total synthesis calls for a dithiane coupling reaction to construct the C(20)-C(21) bond, a Stille coupling reaction to form the C(11)-C(12) bond, and a Yamaguchi macrolactonization to assemble the macrolide ring, as well as two glycosidation reactions to fuse the carbohydrate units onto the molecule. First and second generation syntheses to the required fragments for apoptolidin (1) are described.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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30
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Wender PA, Jankowski OD, Tabet EA, Seto H. Facile synthetic access to and biological evaluation of the macrocyclic core of apoptolidin. Org Lett 2003; 5:2299-302. [PMID: 12816433 DOI: 10.1021/ol0346335] [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: 11/28/2022]
Abstract
Oxidative cleavage of the C-20/C-21 bond in apoptolidin (1) provides two fragments of similar complexity, facilitating a divide-and-diversify strategy for the determination of the structural basis for apoptolidin's biological activity, the remarkably selective induction of apoptosis in sensitive cell lines. The ability of compounds derived from this cleavage to inhibit mitochondrial F(0)F(1)-ATPase is reported. [structure: see text]
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
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31
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Chng SS, Xu J, Loh TP. A divergent approach to apoptolidin and FD-891: asymmetric preparation of a common intermediate. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01173-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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32
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Wender PA, Jankowski OD, Tabet EA, Seto H. Toward a structure-activity relationship for apoptolidin: selective functionalization of the hydroxyl group array. Org Lett 2003; 5:487-90. [PMID: 12583750 DOI: 10.1021/ol027366w] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] To investigate the structural basis for the exceptional selectivity and activity of apoptolidin (1), a strategy has been devised that allows for selective functionalization of seven of its eight hydroxyl groups based on progressive silyl protection, derivatization, and deprotection. The syntheses of these derivatives and their ability to inhibit F(0)F(1)-ATPase are reported.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, California, 94305-5080, USA.
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33
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Wender PA, Gulledge AV, Jankowski OD, Seto H. Isoapoptolidin: structure and activity of the ring-expanded isomer of apoptolidin. Org Lett 2002; 4:3819-22. [PMID: 12599467 DOI: 10.1021/ol0266222] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[formula: see text] Apoptolidin (1) is a novel oncolytic lead that induces apoptosis in transformed cell lines with exceptional selectivity. We report the isolation and characterization of a ring-expanded macrolide isomer of apoptolidin: isoapoptolidin (2). The solution conformation of isoapoptolidin is described. The rate of isomerization was measured under biologically relevant conditions and found to approach equilibrium within the time frame of most cell-based assays. Isoapoptolidin's ability to inhibit mitochondrial F0F1-ATPase is over 10-fold less than that of apoptolidin.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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34
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Ghosh AK, Kim JH. Chelation-controlled ester-derived titanium enolate aldol reaction: diastereoselective syn-aldols with mono- and bidentate aldehydes. Tetrahedron Lett 2002; 43:5621-5624. [PMID: 30449907 PMCID: PMC6234980 DOI: 10.1016/s0040-4039(02)01113-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A chelation-controlled and highly diastereoselective synthesis of syn-aldols is described. Aldol reaction of (S)-valinol-derived ester with a variety of aldehydes proceeded with high syn-diastereoselectivities (up to 99:1) and isolated yields (94%).
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60607, USA
| | - Jae-Hun Kim
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60607, USA
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35
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Marmsäter FP, Vanecko JA, West F. Cyclic oxonium ylides: building blocks for iterative synthesis of polycyclic ethers. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00051-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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36
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Toshima K, Arita T, Kato K, Tanaka D, Matsumura S. Synthetic studies on apoptolidin: synthesis of the C1–C21 macrolide fragment. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01948-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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Nicolaou KC, Li Y, Fylaktakidou KC, Mitchell HJ, Wei HX, Weyershausen B. Totalsynthese von Apoptolidin - Teil 1: Retrosynthese und Aufbau von Schlüsselintermediaten. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20011015)113:20<3968::aid-ange3968>3.0.co;2-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Nicolaou KC, Li Y, Fylaktakidou KC, Mitchell HJ, Wei HX, Weyershausen B. Total Synthesis of Apoptolidin: Part 1. Retrosynthetic Analysis and Construction of Building Blocks. Angew Chem Int Ed Engl 2001; 40:3849-3854. [DOI: 10.1002/1521-3773(20011015)40:20<3849::aid-anie3849>3.0.co;2-m] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2001] [Indexed: 11/12/2022]
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40
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Ester derived titanium enolate aldol reaction: chelation controlled diastereoselective synthesis of syn-aldols. Tetrahedron Lett 2001; 42:1227-1231. [PMID: 31303686 DOI: 10.1016/s0040-4039(00)02227-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A chelation controlled and highly diastereoselective synthesis of syn-aldols is described. Aldol reaction of commercially available L-phenylalaninol derived esters with a variety of bidentate oxyaldehydes proceeded with excellent syn-diastereoselectivities and isolated yields.
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41
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Crimmins MT, King BW, Tabet EA, Chaudhary K. Asymmetric aldol additions: use of titanium tetrachloride and (-)-sparteine for the soft enolization of N-acyl oxazolidinones, oxazolidinethiones, and thiazolidinethiones. J Org Chem 2001; 66:894-902. [PMID: 11430110 DOI: 10.1021/jo001387r] [Citation(s) in RCA: 290] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Asymmetric aldol additions using chlorotitanium enolates of N-acyloxazolidinone, oxazolidinethione, and thiazolidinethione propionates proceed with high diastereoselectivity for the Evans or non-Evans syn product depending on the nature and amount of the base used. With 1 equiv of titanium tetrachloride and 2 equiv of (-)-sparteine as the base or 1 equiv of (-)-sparteine and 1 equiv of N-methyl-2-pyrrolidinone, selectivities of 97:3 to > 99:1 were obtained for the Evans syn aldol products using N-propionyl oxazolidinones, oxazolidinethiones, and thiazolidinethiones. The non-Evans syn aldol adducts are available with the oxazolidinethione and thiazolidinethiones by altering the Lewis acid/amine base ratios. The change in facial selectivity in the aldol additions is proposed to be a result of switching of mechanistic pathways between chelated and nonchelated transition states. The auxiliaries can be reductively removed or cleaved by nucleophilic acyl substitution. Iterative aldol sequences with high diastereoselectivity can also be accomplished.
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Affiliation(s)
- M T Crimmins
- Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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