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Chen SS, Bai J. Antitumor potential of tricyclic pyridone analogues from an entomopathogenic fungus, Fusarium avenaceum SYKC02-P-1. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2023; 25:139-146. [PMID: 35543091 DOI: 10.1080/10286020.2022.2072734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/27/2022] [Indexed: 06/14/2023]
Abstract
Two new tricyclic pyridone analogues, fusapyridons C (1) and D (2), were isolated along with structurally related known compounds 3 - 5 from the entomopathogenic fungus, F. avenaceum SYKC02-P-1. The structures of compounds 1 and 2 were elucidated by analyzing the spectral data of UV, 1 D and 2 D NMR as well as HRESIMS. The absolute configurations of fusapyridons C and D were established by means of single crystal X-ray diffraction and electronic circular dichroism calculation. And antitumor testing of all the isolates showed that compounds 4 and 5 exhibited significant inhibitory activity against the human prostate cancer cells (PC-3 cell lines) with IC50 values of 2.76 and 1.86 μM, respectively.
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Affiliation(s)
- Sheng-Shuang Chen
- Key Laboratory of Structure-Based Drug Design and Discovery (Shenyang Pharmaceutical University), Ministry of Education, Shenyang 110016, China
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jiao Bai
- Key Laboratory of Structure-Based Drug Design and Discovery (Shenyang Pharmaceutical University), Ministry of Education, Shenyang 110016, China
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China
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2
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Abstract
4-Hydroxy-2-pyridone alkaloids have attracted attention for synthetic and biosynthetic studies due to their broad biological activities and structural diversity. Here, we elucidated the pathway and chemical logic of (-)-sambutoxin (1) biosynthesis. In particular, we uncovered the enzymatic origin of the tetrahydropyran moiety and showed that the p-hydroxyphenyl group is installed via a late-stage, P450-catalyzed oxidation of the phenylalanine-derived side chain rather than via a direct incorporation of tyrosine.
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Affiliation(s)
- Eun Bin Go
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Lee Joon Kim
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Hosea M Nelson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
- Department of Chemistry, California Institute of Technology, Pasadena, California 91125, United States
| | - Masao Ohashi
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States
| | - Yi Tang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States
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3
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Secondary Metabolites with α-Glucosidase Inhibitory Activity from Mangrove Endophytic Fungus Talaromyces sp. CY-3. Mar Drugs 2021; 19:md19090492. [PMID: 34564154 PMCID: PMC8465095 DOI: 10.3390/md19090492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/26/2021] [Accepted: 08/27/2021] [Indexed: 11/17/2022] Open
Abstract
Eight new compounds, including two sambutoxin derivatives (1-2), two highly oxygenated cyclopentenones (7-8), four highly oxygenated cyclohexenones (9-12), together with four known sambutoxin derivatives (3-6), were isolated from semimangrove endophytic fungus Talaromyces sp. CY-3, under the guidance of molecular networking. The structures of new isolates were elucidated by analysis of detailed spectroscopic data, ECD spectra, chemical hydrolysis, 13C NMR calculation, and DP4+ analysis. In bioassays, compounds 1-5 displayed better α-glucosidase inhibitory activity than the positive control 1-deoxynojirimycin (IC50 = 80.8 ± 0.3 μM), and the IC50 value was in the range of 12.6 ± 0.9 to 57.3 ± 1.3 μM.
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4
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Nazarski RB. Summary of DFT calculations coupled with current statistical and/or artificial neural network (ANN) methods to assist experimental NMR data in identifying diastereomeric structures. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2020.152548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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5
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Inuki S, Sato K, Zui N, Yamaguchi R, Matsumaru T, Fujimoto Y. Synthetic Studies on FNC-RED and Its Analogues Containing an All syn-Cyclopentanetetrol Moiety. J Org Chem 2019; 84:12680-12685. [PMID: 31507185 DOI: 10.1021/acs.joc.9b02101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
FNC-RED exhibits innate immune receptor Toll-like receptor 4 (TLR4)/myeloid differentiation factor-2 (MD2) stimulatory activity. We have developed a divergent synthetic route to FNC-RED derivatives containing various alkyl side chains. Key features of the synthetic study include stepwise palladium catalyzed cross-coupling reactions and the construction of an all syn-cyclopentanetetrol moiety.
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Affiliation(s)
- Shinsuke Inuki
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan.,Graduate School of Pharmaceutical Sciences , Kyoto University , Sakyo-ku , Kyoto 606-8501 , Japan
| | - Keisuke Sato
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Naoto Zui
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Ryosuke Yamaguchi
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Takanori Matsumaru
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Yukari Fujimoto
- Graduate School of Science and Technology , Keio University , Hiyoshi, Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
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6
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Hall JA, Seedarala S, Rice N, Kopel L, Halaweish F, Blagg BSJ. Cucurbitacin D Is a Disruptor of the HSP90 Chaperone Machinery. JOURNAL OF NATURAL PRODUCTS 2015; 78:873-9. [PMID: 25756299 PMCID: PMC5892428 DOI: 10.1021/acs.jnatprod.5b00054] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Heat shock protein 90 (Hsp90) facilitates the maturation of many newly synthesized and unfolded proteins (clients) via the Hsp90 chaperone cycle, in which Hsp90 forms a heteroprotein complex and relies upon cochaperones, immunophilins, etc., for assistance in client folding. Hsp90 inhibition has emerged as a strategy for anticancer therapies due to the involvement of clients in many oncogenic pathways. Inhibition of chaperone function results in client ubiquitinylation and degradation via the proteasome, ultimately leading to tumor digression. Small molecule inhibitors perturb ATPase activity at the N-terminus and include derivatives of the natural product geldanamycin. However, N-terminal inhibition also leads to induction of the pro-survival heat shock response (HSR), in which displacement of the Hsp90-bound transcription factor, heat shock factor-1, translocates to the nucleus and induces transcription of heat shock proteins, including Hsp90. An alternative strategy for Hsp90 inhibition is disruption of the Hsp90 heteroprotein complex. Disruption of the Hsp90 heteroprotein complex is an effective strategy to prevent client maturation without induction of the HSR. Cucurbitacin D, isolated from Cucurbita texana, and 3-epi-isocucurbitacin D prevented client maturation without induction of the HSR. Cucurbitacin D also disrupted interactions between Hsp90 and two cochaperones, Cdc37 and p23.
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Affiliation(s)
- Jessica A. Hall
- Department of Medicinal Chemistry, The University Of Kansas, 1251 Wescoe Hall Drive, 4070 Malott Hall, Lawrence, KS 66045
| | - Sahithi Seedarala
- Department of Medicinal Chemistry, The University Of Kansas, 1251 Wescoe Hall Drive, 4070 Malott Hall, Lawrence, KS 66045
| | - Nichole Rice
- Department of Chemistry & Biochemistry, South Dakota State University, Brookings, SD 57007
| | - Lucas Kopel
- Department of Chemistry & Biochemistry, South Dakota State University, Brookings, SD 57007
| | - Fathi Halaweish
- Department of Chemistry & Biochemistry, South Dakota State University, Brookings, SD 57007
| | - Brian S. J. Blagg
- Department of Medicinal Chemistry, The University Of Kansas, 1251 Wescoe Hall Drive, 4070 Malott Hall, Lawrence, KS 66045
- Corresponding author: Brian S. J. Blagg, Phone number: (785) 864-2288,
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7
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Ding F, Leow ML, Ma J, William R, Liao H, Liu XW. Collective Synthesis of 4-Hydroxy-2-pyridone Alkaloids and Their Antiproliferation Activities. Chem Asian J 2014; 9:2548-54. [DOI: 10.1002/asia.201402466] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Indexed: 12/18/2022]
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8
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Ding F, William R, Leow ML, Chai H, Fong JZM, Liu XW. Directed Orthometalation and the Asymmetric Total Synthesis of N-Deoxymilitarinone A and Torrubiellone B. Org Lett 2013; 16:26-9. [DOI: 10.1021/ol402820d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Feiqing Ding
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Ronny William
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Min Li Leow
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Hua Chai
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Jacqueline Zi Mei Fong
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Xue-Wei Liu
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, Nanyang Technological University, Singapore 637371
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9
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Schmidt Y, Lehr K, Colas L, Breit B. Assignment of Relative Configuration of Desoxypropionates by1H NMR Spectroscopy: Method Development, Proof of Principle by Asymmetric Total Synthesis of Xylarinic Acid A and Applications. Chemistry 2012; 18:7071-81. [DOI: 10.1002/chem.201103988] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Indexed: 11/12/2022]
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10
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Umezawa T, Sueda M, Kamura T, Kawahara T, Han X, Okino T, Matsuda F. Synthesis and biological activity of kalkitoxin and its analogues. J Org Chem 2011; 77:357-70. [PMID: 22111947 DOI: 10.1021/jo201951s] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Total syntheses of kalkitoxin, isolated from the Caribbean Lyngbya majuscula, and its analogues, 3-epi-, 7-epi-, 8-epi-, 10-epi-, 10-nor-, and 16-nor-kalkitoxin, were achieved via oxazolidinone-based diastereoselective 1,4-addition reaction of a methyl group and efficient TiCl(4)-mediated thiazoline ring formation as the key steps. The biological activities of synthetic kalkitoxin and its analogues were evaluated with brine shrimp.
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Affiliation(s)
- Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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11
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Fotiadou AD, Zografos AL. Accessing the Structural Diversity of Pyridone Alkaloids: Concise Total Synthesis of Rac-Citridone A. Org Lett 2011; 13:4592-5. [DOI: 10.1021/ol2017802] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Anna D. Fotiadou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
| | - Alexandros L. Zografos
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
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12
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Biomimetic conversion of (-)-fusoxypyridone and (-)-oxysporidinone to (-)-sambutoxin: further evidence for the structure of the tricyclic pyridone alkaloid, (-)-fusoxypyridone. Bioorg Med Chem Lett 2011; 21:2327-9. [PMID: 21419624 DOI: 10.1016/j.bmcl.2011.02.091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Revised: 02/16/2011] [Accepted: 02/22/2011] [Indexed: 11/22/2022]
Abstract
Biomimetic-type reactions of the tricyclic pyridone alkaloid, (-)-fusoxypyridone [(-)-4,6'-anhydrooxysporidinone] (1), recently encountered in an endophytic strain of Fusarium oxysporum, and (-)-oxysporidinone (2) afforded (-)-sambutoxin (3) and an analogue of 1, identified as (-)-1'(6')-dehydro-4,6'-anhydrooxysporidinone (4), thus confirming the structure previously proposed for 1 and suggesting that 1-3 bear the same relative stereochemistry. Oxidation of 4 with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) yielded a hitherto unknown sambutoxin analogue, (-)-4,2'-anhydrosambutoxin (5).
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13
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Jessen HJ, Schumacher A, Shaw T, Pfaltz A, Gademann K. A Unified Approach for the Stereoselective Total Synthesis of Pyridone Alkaloids and Their Neuritogenic Activity. Angew Chem Int Ed Engl 2011; 50:4222-6. [DOI: 10.1002/anie.201007671] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Indexed: 01/24/2023]
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14
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Jessen HJ, Schumacher A, Shaw T, Pfaltz A, Gademann K. Ein einheitlicher Ansatz zur stereoselektiven Totalsynthese von Pyridonalkaloiden und deren neuritogene Aktivität. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007671] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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15
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Jessen HJ, Gademann K. 4-Hydroxy-2-pyridone alkaloids: Structures and synthetic approaches. Nat Prod Rep 2010; 27:1168-85. [PMID: 20532354 DOI: 10.1039/b911516c] [Citation(s) in RCA: 171] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Henning Jacob Jessen
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056, Basel, Switzerland
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16
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Bräse S, Encinas A, Keck J, Nising CF. Chemistry and Biology of Mycotoxins and Related Fungal Metabolites. Chem Rev 2009; 109:3903-90. [DOI: 10.1021/cr050001f] [Citation(s) in RCA: 411] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Stefan Bräse
- Institut für Organische Chemie,Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany
| | - Arantxa Encinas
- Institut für Organische Chemie,Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany
| | - Julia Keck
- Institut für Organische Chemie,Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany
| | - Carl F. Nising
- Institut für Organische Chemie,Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany
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17
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Williams DR, Kammler DC, Donnell AF, Goundry WRF. Total synthesis of (+)-apiosporamide: assignment of relative and absolute configuration. Angew Chem Int Ed Engl 2006; 44:6715-8. [PMID: 16187387 DOI: 10.1002/anie.200502015] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- David R Williams
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN 47405-7102, USA.
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18
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R. Williams D, C. Kammler D, R. F. Goundry W. An Enantiocontrolled Approach for the Synthesis of Chiral 3,5-Disubstituted 2(1H)-pyridinones. HETEROCYCLES 2006. [DOI: 10.3987/com-05-s(t)70] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Williams DR, Kammler DC, Donnell AF, Goundry WRF. Total Synthesis of (+)-Apiosporamide: Assignment of Relative and Absolute Configuration. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200502015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Williams DR, Nold AL, Mullins RJ. Asymmetric Conjugate Addition for the Preparation of syn-1,3-Dimethyl Arrays: Synthesis and Structure Elucidation of Capensifuranone. J Org Chem 2004; 69:5374-82. [PMID: 15287784 DOI: 10.1021/jo049567e] [Citation(s) in RCA: 39] [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
The synthesis of capensifuranone (1) has been achieved by the application of developments for asymmetric conjugate addition reactions of organocopper reagents with nonracemic N-enoyl-4-phenyl-1,3-oxazolidinones for the preparation of 1,3-syn-dimethyl arrays. The assignment of relative and absolute stereochemistry of 1 has been made following the high-field NMR characterizations of synthetic diol derivatives. The previously unassigned C4 stereochemistry of 1 was determined to be of the (S)-configuration. The thermodynamic equilibration of capensifuranone and its C4 diastereomer has been examined.
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Affiliation(s)
- David R Williams
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA.
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21
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Negishi EI, Tan Z, Liang B, Novak T. An efficient and general route to reduced polypropionates via Zr-catalyzed asymmetric CC bond formation. Proc Natl Acad Sci U S A 2004; 101:5782-7. [PMID: 15073327 PMCID: PMC395985 DOI: 10.1073/pnas.0307514101] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An efficient and general method for the synthesis of reduced polypropionates has been developed through the application of asymmetric carboalumination of alkenes catalyzed by dichlorobis(1-neomenthylindenyl)zirconium [(NMI)(2)ZrCl(2)]. In this investigation, attention has been focused on those reduced polypropionates that are alpha-monoheterofunctional and either omega-ethyl or omega-n-propyl. The reaction of 3-buten-1-ol with triethylaluminum (Et(3)Al) or tripropylaluminum ((n)Pr(3)Al) in the presence of (NMI)(2)ZrCl(2) and isobutylaluminoxane gave, after protonolysis, (R)-3-methyl-1-pentanol as well as (R)- and (S)-3-methyl-1-hexanols in 88-92% yield in 90-92% enantiomeric excess in one step. These 3-monomethyl-1-alkanols were then converted to two stereoisomers each of 2,4-dimethyl-1-hexanols and 2,4-dimethyl-1-heptanols via methylalumination catalyzed by (NMI)(2)ZrCl(2) and methylaluminoxane followed by oxidation with O(2). The four-step (or three-isolation-step) protocol provided syn-2,4-dimethyl-1-alkanols of >/=98% stereoisomeric purity in approximately 50% overall yields, whereas (2S,4R)-2,4-dimethyl-1-hexanol of comparable purity was obtained in 40% overall yield. Commercial availability of (S)-2-methyl-1-butanol as a relatively inexpensive material suggested its use in the synthesis of (2S,4S)- and (2R,4S)-2,4-dimethyl-1-hexanols via a three-step protocol consisting of (i) iodination, (ii) zincation followed by Pd-catalyzed vinylation, and (iii) Zr-catalyzed methylalumination followed by oxidation with O(2). This three-step protocol is iterative and applicable to the synthesis of reduced polypropionates containing three or more branching methyl groups, rendering this method for the synthesis of reduced polypropionates generally applicable. Its synthetic utility has been demonstrated by preparing the side chain of zaragozic acid A and the C11-C20 fragment of antibiotics TMC-151 A-F.
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Affiliation(s)
- Ei-Ichi Negishi
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA.
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Magnin-Lachaux M, Tan Z, Liang B, Negishi EI. Efficient and Selective Synthesis of Siphonarienolone and Related Reduced Polypropionates via Zr-Catalyzed Asymmetric Carboalumination. Org Lett 2004; 6:1425-7. [PMID: 15101758 DOI: 10.1021/ol0497483] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Siphonarienolone (1) has been synthesized from siphonarienal (3) in 66% over four steps. Synthesis of 3, in turn, has been achieved in two steps (85% combined yield) from 4, prepared from 3-buten-1-ol in seven steps (23% combined yield). Also, a two-step conversion of 3 into siphonarienone (2) is reported.
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Affiliation(s)
- Marina Magnin-Lachaux
- Herbert C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, USA
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23
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Williams DR, Kissel WS, Li JJ, Mullins RJ. Stereoselective synthesis of syn- and anti-1,3- and 1,2-dimethyl arrays via asymmetric conjugate additions. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00638-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
[structure: see text]. A stereocontrolled total synthesis of the polycyclic Stemona alkaloid, (-)-stemospironine (1) has been achieved. Key transformations include the use of a Staudinger reaction leading to the aza-Wittig ring closure of the perhydroazepine system. Formation of the vicinal pyrrolidine butyrolactone is described via the stereoselective intramolecular capture of an intermediate aziridinium salt.
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Affiliation(s)
- D R Williams
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405-7102, USA.
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