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Khademi Z, Heravi MM. Applications of Claisen condensations in total synthesis of natural products. An old reaction, a new perspective. Tetrahedron 2022. [DOI: 10.1016/j.tet.2021.132573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Recent advances in the applications of Wittig reaction in the total synthesis of natural products containing lactone, pyrone, and lactam as a scaffold. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-019-02465-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Raghavan S, Patel JS. A Stereoselective Synthesis of the Carbon Backbone of Phoslactomycin B. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700379] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sadagopan Raghavan
- Natural Product Chemistry Division; Indian Institute of Chemical Technology; Hyderabad India
- Academy of Scientific and Innovative Research; Indian Institute of Chemical Technology; Hyderabad India
| | - Javed Sardar Patel
- Natural Product Chemistry Division; Indian Institute of Chemical Technology; Hyderabad India
- Academy of Scientific and Innovative Research; Indian Institute of Chemical Technology; Hyderabad India
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Trost BM, Biannic B, Brindle CS, O'Keefe BM, Hunter TJ, Ngai MY. A Highly Convergent Total Synthesis of Leustroducsin B. J Am Chem Soc 2015; 137:11594-7. [PMID: 26313159 PMCID: PMC4621997 DOI: 10.1021/jacs.5b07438] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Leustroducsin
B exhibits a large variety of biological activities
and unique structural features. An efficient and highly convergent
total synthesis of Leustroducsin B was achieved in 17 longest linear
and 39 total steps by disconnecting the molecule into three fragments
having similar levels of complexity. These pieces were connected via
a highly efficient chelate-controlled addition of a vinyl zincate
to an α-hydroxy ketone and a silicon-mediated cross-coupling.
The stereochemistry of the central and western fragments was set catalytically
in high yields and excellent de by a zinc-ProPhenol-catalyzed aldol
reaction and a palladium-catalyzed asymmetric allylic alkylation.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Berenger Biannic
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Cheyenne S Brindle
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - B Michael O'Keefe
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Thomas J Hunter
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
| | - Ming-Yu Ngai
- Department of Chemistry, Stanford University , Stanford, California 94305-5580, United States
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Greszler SN, Malinowski JT, Johnson JS. Formal synthesis of leustroducsin B via Reformatsky/Claisen condensation of silyl glyoxylates. Org Lett 2011; 13:3206-9. [PMID: 21591684 PMCID: PMC3115596 DOI: 10.1021/ol2011192] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A formal synthesis of leustroducsin B has been completed. The synthesis relies upon a recently developed Reformatsky/Claisen condensation of silyl glyoxylates and enantioenriched β-lactones that establishes two of the molecule's three core stereocenters and permits further elaboration to an intermediate in Imanishi's synthesis via reliable chemistry (Prasad reduction, asymmetric pentenylation, Mitsunobu inversion).
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Affiliation(s)
- Stephen N. Greszler
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Justin T. Malinowski
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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Miyashita K, Tsunemi T, Hosokawa T, Ikejiri M, Imanishi T. Total Synthesis of Leustroducsin B. J Org Chem 2008; 73:5360-70. [DOI: 10.1021/jo8005599] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazuyuki Miyashita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan, and Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikiori-kita, Tondabayashi, Osaka 584-8540, Japan
| | - Tomoyuki Tsunemi
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan, and Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikiori-kita, Tondabayashi, Osaka 584-8540, Japan
| | - Takafumi Hosokawa
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan, and Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikiori-kita, Tondabayashi, Osaka 584-8540, Japan
| | - Masahiro Ikejiri
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan, and Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikiori-kita, Tondabayashi, Osaka 584-8540, Japan
| | - Takeshi Imanishi
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan, and Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikiori-kita, Tondabayashi, Osaka 584-8540, Japan
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Miyashita K, Tsunemi T, Hosokawa T, Ikejiri M, Imanishi T. Total synthesis of leustroducsin B via a convergent route. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.03.152] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
A convergent total synthesis of leustroducsin B (1), which is known to exhibit a variety of biological activities, was successfully carried out. Notable features of our synthesis include construction of the C8 stereocenter by lipase-mediated desymmetrization of meso-diol 4 (90.2% ee) and preparation of the C9-C11 anti-diol moiety by the addition of alkynylzinc reagent 20 to the aldehyde 19. Furthermore, a new diol protecting group, p-silyloxybenzylidene, was developed for the deprotection from densely functionalized substrates under weakly acidic conditions. The protecting group was easily removed in a two-step procedure ((HF)3.Et3N; AcOH-THF-H2O).
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Affiliation(s)
- Kousei Shimada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Matsuhashi H, Shimada K. Chemical transformation of Leustroducsins: synthesis of Leustroducsin B. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00528-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Koishi R, Yoshimura C, Kohama T, Serizawa N. Leustroducsin B activates nuclear factor-kappaB via the acidic sphingomyelinase pathway in human bone marrow-derived stromal cell line KM-102. J Interferon Cytokine Res 2002; 22:343-50. [PMID: 12034042 DOI: 10.1089/107999002753675776] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The novel colony-stimulating factor (CSF) inducer leustroducsin B (LSN-B), which was isolated from Streptomyces platensis, has been shown to have potent cytokine-inducing activities in clonal human bone marrow-derived stromal cell line KM-102 and in primary human bone marrow-derived stromal cells. In this study, we investigated the signal transduction pathway of LSN-B using luciferase expression plasmids linked to the 5'-flanking region of interleukin-8 (IL-8) and that of the IL-11 gene. In KM-102 cells, LSN-B induced luciferase activity both in the wild-type and in the activated protein 1 (AP-1) site point-mutated IL-8 promoter. The mutation in the nuclear factor-kappaB (NF-kappaB) site abrogated LSN-B-stimulated induction of the reporter gene. LSN-B-inducing activity was inhibited by (1) N-acetyl-L-cysteine, a well-characterized antioxidant, (2) cationic amphiphilic drugs, inhibitors of acidic sphingomyelinase (A-SMase), and (3) D609, an inhibitor of phosphatidylcholine-specific phospholipase C (PC-PLC). These observations suggest that LSN-B potentiates the A-SMase-mediated signaling pathway to stimulate NF-kappaB. In contrast, LSN-B did not induce IL-11 promoter-driven luciferase activity. The observed increase in IL-11 mRNA stability by LSN-B indicates that the inducible production of IL-11 by LSN-B is regulated at the posttranscriptional level. In addition, inhibition of LSN-B-mediated induction of IL-11 production by cationic amphiphilic drugs and D609 in KM-102 cells demonstrates that increased IL-11 mRNA stability by LSN-B might be mediated via NF-kappaB activation. From these results, we suggest that LSN-B induces cytokine production through at least two separate mechanisms, at the transcriptional level and at the posttranscriptional level via NF-kappaB activation.
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Affiliation(s)
- Ryuta Koishi
- Biomedical Research Laboratories, Sankyo Co., Ltd., Tokyo, Japan.
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