1
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Joaquin D, Mansfield SA, Chanthakhoun JC, LeSueur AK, Blackburn TA, Castle SL. Synthesis and Studies of Bulky Cycloalkyl α,β-Dehydroamino Acids that Enhance Proteolytic Stability. Org Lett 2022; 24:5329-5333. [PMID: 35839437 PMCID: PMC10243721 DOI: 10.1021/acs.orglett.2c01962] [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
Three new bulky cycloalkyl α,β-dehydroamino acids (ΔAAs) have been designed and synthesized. Each residue enhances the rigidity of model peptides and their stability to proteolysis, with larger ring sizes exhibiting greater effects. Peptides containing bulky cycloalkyl ΔAAs are inert to conjugate addition by a nucleophilic thiol. The results suggest that these residues will be effective tools for improving the proteolytic stability of bioactive peptides.
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Affiliation(s)
- Daniel Joaquin
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Samuel A Mansfield
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Joseph C Chanthakhoun
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Austin K LeSueur
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Tiffani A Blackburn
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Steven L Castle
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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2
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Nanjo T, Oshita T, Matsumoto A, Takemoto Y. Late‐Stage Installation of Dehydroamino Acid Motifs into Peptides Enabled by an
N
‐Chloropeptide Strategy. Chemistry 2022; 28:e202201120. [DOI: 10.1002/chem.202201120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Indexed: 12/31/2022]
Affiliation(s)
- Takeshi Nanjo
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku, Yoshida Kyoto 606-8501 Japan
| | - Takuma Oshita
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku, Yoshida Kyoto 606-8501 Japan
| | - Ayaka Matsumoto
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku, Yoshida Kyoto 606-8501 Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku, Yoshida Kyoto 606-8501 Japan
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3
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Yasuno Y, Okamura H, Shinada T. Stereoselective Synthesis of Dehydroamino Acids and Its Application to the Synthesis of Nitrogen-containing Natural Products. J SYN ORG CHEM JPN 2022. [DOI: 10.5059/yukigoseikyokaishi.80.331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Moyá DA, Lee MA, Chanthakhoun JC, LeSueur AK, Joaquin D, Barfuss JD, Castle SL. Towards a streamlined synthesis of peptides containing α,β-dehydroamino acids. Tetrahedron Lett 2021; 74:153175. [PMID: 34176981 PMCID: PMC8224935 DOI: 10.1016/j.tetlet.2021.153175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Investigation of a strategy to streamline the synthesis of peptides containing α,β-dehydroamino acids (ΔAAs) is reported. The key step involves generating the alkene moiety via elimination of a suitable precursor after it has been inserted into a peptide chain. This process obviates the need to prepare ΔAA-containing azlactone dipeptides to facilitate coupling of these residues. Z-dehydroaminobutyric acid (Z-ΔAbu) could be constructed most efficiently via EDC/CuCl-mediated dehydration of Thr. Formation of Z-ΔPhe by this or other dehydration methods was unsuccessful. Production of the bulky ΔVal residue could be accomplished by DAST-promoted dehydrations of β-OHVal or by DBU-triggered eliminations of sulfonium ions derived from penicillamine derivatives. However, competitive formation of an oxazoline byproduct remains problematic.
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Affiliation(s)
- Diego A Moyá
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Michael A Lee
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Joseph C Chanthakhoun
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Austin K LeSueur
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Daniel Joaquin
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Jaden D Barfuss
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Steven L Castle
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
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5
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Cai Y, Ma Z, Jiang J, Lo CCL, Luo S, Jalan A, Cardon JM, Ramos A, Moyá DA, Joaquin D, Castle SL. Convergent Total Synthesis of Yaku'amide A. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yu Cai
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Zhiwei Ma
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Jintao Jiang
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Concordia C. L. Lo
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Shi Luo
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Ankur Jalan
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Joseph M. Cardon
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Alexander Ramos
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Diego A. Moyá
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Daniel Joaquin
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
| | - Steven L. Castle
- Department of Chemistry and Biochemistry Brigham Young University Provo UT 84602 USA
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6
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Cai Y, Ma Z, Jiang J, Lo CCL, Luo S, Jalan A, Cardon JM, Ramos A, Moyá DA, Joaquin D, Castle SL. Convergent Total Synthesis of Yaku'amide A. Angew Chem Int Ed Engl 2021; 60:5162-5167. [PMID: 33336547 DOI: 10.1002/anie.202014238] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Indexed: 12/11/2022]
Abstract
Total synthesis of the anticancer peptide natural product yaku'amide A is reported. Its β-tert-hydroxy amino acids were prepared by regioselective aminohydroxylation involving a chiral mesyloxycarbamate reagent. Stereospecific construction of the E- and Z-ΔIle residues was accomplished through a one-pot reaction featuring anti dehydration, azide reduction, and O→N acyl transfer. Alkene isomerization was negligible during this process. These methods enabled a highly convergent and efficient synthetic route to the natural product.
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Affiliation(s)
- Yu Cai
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Zhiwei Ma
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Jintao Jiang
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Concordia C L Lo
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Shi Luo
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Ankur Jalan
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Joseph M Cardon
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Alexander Ramos
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Diego A Moyá
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Daniel Joaquin
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
| | - Steven L Castle
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
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7
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Kamiya K, Miura K, Itoh H, Inoue M. Divergent Solid‐Phase Synthesis and Biological Evaluation of Yaku'amide B and Its Seven
E
/
Z
Isomers. Chemistry 2020; 27:1088-1093. [DOI: 10.1002/chem.202003858] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Indexed: 12/15/2022]
Affiliation(s)
- Koichi Kamiya
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Kensuke Miura
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
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8
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Itoh H, Miura K, Kamiya K, Yamashita T, Inoue M. Solid‐Phase Total Synthesis of Yaku'amide B Enabled by Traceless Staudinger Ligation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916517] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hiroaki Itoh
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Kensuke Miura
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Koichi Kamiya
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Tomoya Yamashita
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
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9
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Itoh H, Miura K, Kamiya K, Yamashita T, Inoue M. Solid-Phase Total Synthesis of Yaku'amide B Enabled by Traceless Staudinger Ligation. Angew Chem Int Ed Engl 2020; 59:4564-4571. [PMID: 31943639 DOI: 10.1002/anie.201916517] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Indexed: 11/09/2022]
Abstract
We report a solid-phase strategy for total synthesis of the peptidic natural product yaku'amide B (1), which exhibits antiproliferative activity against various cancer cells. Its linear tridecapeptide sequence bears four β,β-dialkylated α,β-dehydroamino acid residues and is capped with an N-terminal acyl group (NTA) and a C-terminal amine (CTA). To realize the Fmoc-based solid-phase synthesis of this complex structure, we developed new methods for enamide formation, enamide deprotection, and C-terminal modification. First, traceless Staudinger ligation enabled enamide formation between sterically encumbered alkenyl azides and newly designed phosphinophenol esters. Second, application of Eu(OTf)3 led to chemoselective removal of the enamide Boc groups without detaching the resin linker. Finally, resin-cleavage and C-terminus modification were simultaneously achieved with an ester-amide exchange reaction using CTA and AlMe3 to deliver 1 in 9.1 % overall yield (24 steps from the resin).
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Affiliation(s)
- Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Kensuke Miura
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Koichi Kamiya
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Tomoya Yamashita
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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10
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Hjerrild P, Tørring T, Poulsen TB. Dehydration reactions in polyfunctional natural products. Nat Prod Rep 2020; 37:1043-1064. [DOI: 10.1039/d0np00009d] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Here, we review methods for chemical dehydration of alcohols to alkenes and discuss the potential of late-stage functionalization by direct, site- and chemo-selective dehydration of complex molecular substrates.
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Affiliation(s)
- Per Hjerrild
- Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Thomas Tørring
- Department of Engineering – Microbial Biosynthesis
- Aarhus University
- Aarhus C
- Denmark
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11
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Cardon JM, Coombs JC, Ess DH, Castle SL. Insights into base-free OsO 4-catalyzed aminohydroxylations employing chiral ligands. Tetrahedron 2019; 75:945-948. [PMID: 30774161 PMCID: PMC6374041 DOI: 10.1016/j.tet.2019.01.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Attempts to perform the OsO4-catalyzed enantioselective base-free aminohydroxylation of β,β-disubstituted enoates are described. Low yields and racemic products were obtained in the presence of standard chiral ligands, suggesting the occurrence of a "Second Cycle" process due to slow hydrolysis of the amino alcohol product from the Os metal center. Support for this hypothesis was provided by the slightly improved enantioselectivity (60:40 er) obtained with an amino alcohol ligand. Based on density functional theory calculations, it is proposed that the lack of significant enantioselectivity is due to a low-energy (3 + 2) oxo/imido cycloaddition transition state without the chiral ligand in the Second Cycle that outcompetes protonolysis in the First Cycle.
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Affiliation(s)
- Joseph M Cardon
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - James C Coombs
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Daniel H Ess
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | - Steven L Castle
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
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12
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Kitamura K, Itoh H, Sakurai K, Dan S, Inoue M. Target Identification of Yaku’amide B and Its Two Distinct Activities against Mitochondrial FoF1-ATP Synthase. J Am Chem Soc 2018; 140:12189-12199. [DOI: 10.1021/jacs.8b07339] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Kai Kitamura
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kaori Sakurai
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan
| | - Shingo Dan
- Division of Molecular Pharmacology, Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, 3-10-6 Ariake, Koto-ku, Tokyo 135-8550, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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13
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Wołczański G, Lisowski M. A general method for preparation of N-Boc-protected or N-Fmoc-protected α,β-didehydropeptide building blocks and their use in the solid-phase peptide synthesis. J Pept Sci 2018; 24:e3091. [PMID: 29862598 DOI: 10.1002/psc.3091] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/24/2018] [Accepted: 05/02/2018] [Indexed: 12/14/2022]
Abstract
N-(tert-butyloxycarbonyl) or N-(9-fluorenylmethoxycarbonyl) dipeptides with C-terminal (Z)-α,β-didehydrophenylalanine (∆Z Phe), (Z)-α,β-didehydrotyrosine (∆Z Tyr), (Z)-α,β-didehydrotryptophan (∆Z Trp), (Z)-α,β-didehydromethionine (∆Z Met), (Z)-α,β-didehydroleucine (∆Z Leu), and (Z/E)-α,β-didehydroisoleucine (∆Z/E Ile) were synthesised from their saturated analogues via oxidation of intermediate 2,5-disubstituted-oxazol-5-(4H)-ones (also known as azlactones) with pyridinium tribromide followed by opening of the produced unsaturated oxazol-5-(4H)-one derivatives in organic-aqueous solution with a catalytic amount of trifluoroacetic acid or by a basic hydrolysis. In all cases, a very strong preference for Z isomers of α,β-didehydro-α-amino acid residues was observed except of the ΔIle, which was obtained as the equimolar mixture of Z and E isomers. Reasons for the (Z)-stereoselectivity and the increased stability of the aromatic α,β-didehydro-α-amino acid residue oxazol-5-(4H)-ones over the corresponding aliphatic ones are also discussed. It is the first use of such a procedure to synthesise peptides with the C-terminal unsaturated residues and a peptide with 2 consecutive ΔPhe residues. This approach is very effective especially in the synthesis of peptides with aliphatic α,β-didehydro-α-amino acid residues that are difficult to obtain by other methods. It allowed the first synthesis of the ∆Met residue. It is also more cost-effective and less laborious than other synthesis protocols. The dipeptide building blocks obtained were used in the solid-phase synthesis of model peptides on a polystyrene-based solid support. Peptides containing aromatic α,β-didehydro-α-amino acid residues were obtained with PyBOP or TBTU as a coupling agent with good yields and purities. In the case of aliphatic α,β-didehydro-α-amino acid residues, a good efficiency was achieved only with DPPA as a coupling agent.
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Affiliation(s)
- Grzegorz Wołczański
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
| | - Marek Lisowski
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland
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14
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Singjunla Y, Colombano S, Baudoux J, Rouden J. Stereoselective synthesis of dehydroamino acids using malonic acid half oxyester and aromatic aldehydes. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.03.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Yasuno Y, Nishimura A, Yasukawa Y, Karita Y, Ohfune Y, Shinada T. The stereoselective construction of E- and Z-Δ-Ile from E-dehydroamino acid ester: the synthesis of the phomopsin A tripeptide side chain. Chem Commun (Camb) 2016; 52:1478-81. [DOI: 10.1039/c5cc08458j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The synthesis of the phomopsin A tripeptide side chain was achieved by the stereoselective construction of E-Δ-Ile and E-Δ-Asp using α-(diphenylphosphono)glycine.
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Affiliation(s)
- Yoko Yasuno
- Graduate School of Science
- Osaka City University
- Sumiyoshi
- Japan
| | - Akito Nishimura
- Graduate School of Science
- Osaka City University
- Sumiyoshi
- Japan
| | | | - Yuma Karita
- Graduate School of Science
- Osaka City University
- Sumiyoshi
- Japan
| | - Yasufumi Ohfune
- Graduate School of Science
- Osaka City University
- Sumiyoshi
- Japan
| | - Tetsuro Shinada
- Graduate School of Science
- Osaka City University
- Sumiyoshi
- Japan
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16
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Mutoh H, Sesoko Y, Kuranaga T, Itoh H, Inoue M. The total synthesis and functional evaluation of fourteen stereoisomers of yaku'amide B. The importance of stereochemistry for hydrophobicity and cytotoxicity. Org Biomol Chem 2016; 14:4199-204. [DOI: 10.1039/c6ob00640j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Yaku'amide B is a highly unsaturated linear tridecapeptide and an extremely potent cytotoxin.
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Affiliation(s)
- Hiroyuki Mutoh
- Graduate School of Pharmaceutical Sciences
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - Yusuke Sesoko
- Graduate School of Pharmaceutical Sciences
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - Takefumi Kuranaga
- Graduate School of Pharmaceutical Sciences
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences
- The University of Tokyo
- Tokyo 113-0033
- Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences
- The University of Tokyo
- Tokyo 113-0033
- Japan
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17
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Jiang J, Ma Z, Castle SL. Bulky α,β-dehydroamino acids: their occurrence in nature, synthesis, and applications. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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18
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Kuranaga T, Mutoh H, Sesoko Y, Goto T, Matsunaga S, Inoue M. Elucidation and Total Synthesis of the Correct Structures of Tridecapeptides Yaku'amides A and B. Synthesis-Driven Stereochemical Reassignment of Four Amino Acid Residues. J Am Chem Soc 2015; 137:9443-51. [PMID: 26146759 DOI: 10.1021/jacs.5b05550] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Yaku'amides A (1) and B (2) possess four α,β-dehydroamino acid residues in their linear tridecapeptide sequence and differ in their residue-3 (Gly for 1 and Ala for 2). The highly unsaturated peptide structure, characteristic cytotoxicity profile, and extreme scarcity from natural sources motivated us to launch synthetic studies of 1 and 2. Here, we report the total synthesis of the originally proposed structure of yaku'amide B (2a) by applying the route to 1a, which was previously established in our group. However, this accomplishment only proved that 2a and natural 2 were structurally different and prompted investigations directed toward determining the true structure of 2. Extensive Marfey's analyses of minute amounts of natural 2 and its degradation products presented us the possible stereoisomers, all of which were synthetically prepared for chromatographic comparison with the authentic fragments of 2. Based on this detective work, we proposed a corrected structure for yaku'amide B (2c), in which the orders of residues-7 and -8 and residues-11 and -12 are reversed. Finally, the total synthesis of 2c led to confirmation of its structural identity. Moreover, the revised structure of yaku'amide A (1c) was constructed by switching Ala-3 to Gly-3 and was found to be chromatographically matched with the re-isolated natural 1. The present work demonstrated the high reliability and sensitivity of the MS- and LC-based structural analyses and the indispensable role of chemical synthesis in structural elucidation of scarce natural products.
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Affiliation(s)
- Takefumi Kuranaga
- †Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroyuki Mutoh
- †Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yusuke Sesoko
- †Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tomomi Goto
- †Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,‡Research Foundation ITSUU Laboratory, 2-28-10 Tamagawa, Setagaya-ku, Tokyo 158-0094, Japan
| | - Shigeki Matsunaga
- §Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Masayuki Inoue
- †Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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19
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Jiang J, Luo S, Castle SL. Solid-phase synthesis of peptides containing bulky dehydroamino acids. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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