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Freund RRA, van den Borg M, Gaissmaier D, Schlosser R, Jacob T, Arndt HD. Cornforth-Evans Transition States in Stereocontrolled Allylborations of Epoxy Aldehydes. Chemistry 2020; 26:8639-8650. [PMID: 32239742 PMCID: PMC7384170 DOI: 10.1002/chem.202001479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/01/2020] [Indexed: 11/24/2022]
Abstract
Allylboration reactions rank among the most reliable tools in organic synthesis. Herein, we report a general synthesis of trifunctionalized allylboronates and systematic investigations of their stereocontrolled transformations with substituted aldehyde substrates, in order to efficiently access diverse, highly substituted target substrates. A peculiar transition in stereocontrol was observed from the polar Felkin–Anh (PFA) to the Cornforth–Evans (CE) model for alkoxy‐ and epoxy‐substituted aldehydes. CE‐type transition states were uniformly identified as minima in advanced, DFT‐based computational studies of allylboration reactions of epoxy aldehydes, conforming well to the experimental data, and highlighting the underestimated relevance of this model. Furthermore, a mechanism‐based rationale for the substitution pattern of the epoxide was delineated that ensures high levels of stereocontrol and renders α,β‐epoxy aldehydes generally applicable substrates for target synthesis.
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Affiliation(s)
- Robert R A Freund
- Institut für Organische Chemie und Makromolekulare Chemie, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, 07743, Jena, Germany
| | - Matthias van den Borg
- Institut für Elektrochemie, Universität Ulm, Albert-Einstein-Allee 47, 89081, Ulm, Germany
| | - Daniel Gaissmaier
- Institut für Elektrochemie, Universität Ulm, Albert-Einstein-Allee 47, 89081, Ulm, Germany.,Electrochemical Energy Storage, Helmholtz-Institute Ulm (HIU), Helmholtzstr. 11, 89081, Ulm, Germany.,Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany
| | - Robin Schlosser
- Institut für Organische Chemie und Makromolekulare Chemie, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, 07743, Jena, Germany
| | - Timo Jacob
- Institut für Elektrochemie, Universität Ulm, Albert-Einstein-Allee 47, 89081, Ulm, Germany.,Electrochemical Energy Storage, Helmholtz-Institute Ulm (HIU), Helmholtzstr. 11, 89081, Ulm, Germany.,Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany
| | - Hans-Dieter Arndt
- Institut für Organische Chemie und Makromolekulare Chemie, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, 07743, Jena, Germany
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Freund RRA, Gobrecht P, Fischer D, Arndt HD. Advances in chemistry and bioactivity of parthenolide. Nat Prod Rep 2020; 37:541-565. [DOI: 10.1039/c9np00049f] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
(−)-Parthenolide is a germacrane sesquiterpene lactone, available in ample amounts from the traditional medical plant feverfew (Tanacetum parthenium).
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Affiliation(s)
- Robert R. A. Freund
- Institut für Organische Chemie und Makromolekulare Chemie
- Friedrich-Schiller-Universität
- D-07743 Jena
- Germany
| | - Philipp Gobrecht
- Lehrstuhl für Zellphysiologie
- Ruhr-Universität Bochum
- D-44780 Bochum
- Germany
| | - Dietmar Fischer
- Lehrstuhl für Zellphysiologie
- Ruhr-Universität Bochum
- D-44780 Bochum
- Germany
| | - Hans-Dieter Arndt
- Institut für Organische Chemie und Makromolekulare Chemie
- Friedrich-Schiller-Universität
- D-07743 Jena
- Germany
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Freund RRA, Gobrecht P, Rao Z, Gerstmeier J, Schlosser R, Görls H, Werz O, Fischer D, Arndt HD. Stereoselective total synthesis of parthenolides indicates target selectivity for tubulin carboxypeptidase activity. Chem Sci 2019; 10:7358-7364. [PMID: 31489157 PMCID: PMC6713873 DOI: 10.1039/c9sc01473j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 06/14/2019] [Indexed: 12/20/2022] Open
Abstract
The 2-(silyloxymethyl)allylboration of aldehydes was established to enable stereoselective access to α-(exo)-methylene γ-butyrolactones under mild conditions. Acid-labile functionality and chiral carbonyl compounds are tolerated. Excellent asymmetric induction was observed for β,β'-disubstituted α,β-epoxy aldehydes. These findings led to the enantioselective total synthesis of the sesquiterpene natural product (-)-parthenolide, its unnatural (+)-enantiomer, and diastereoisomers. Among all the isomers tested in cell culture, only (-)-parthenolide showed potent inhibition of microtubule detyrosination in living cells, confirming its exquisite selectivity on tubulin carboxypeptidase activity. On the other hand, the anti-inflammatory activity of the parthenolides was weaker and less selective with regard to compound stereochemistry.
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Affiliation(s)
- Robert R A Freund
- Institut für Organische Chemie und Makromolekulare Chemie , Friedrich-Schiller-Universität , Humboldtstr. 10 , 07743 Jena , Germany .
| | - Philipp Gobrecht
- Lehrstuhl für Zellphysiologie , Ruhr-Universität Bochum , Universitätsstr. 150, ND/4 , 44780 Bochum , Germany
| | - Zhigang Rao
- Institut für Pharmazie , Friedrich-Schiller-Universität , Philosophenweg 14 , 07743 Jena , Germany
| | - Jana Gerstmeier
- Institut für Pharmazie , Friedrich-Schiller-Universität , Philosophenweg 14 , 07743 Jena , Germany
| | - Robin Schlosser
- Institut für Organische Chemie und Makromolekulare Chemie , Friedrich-Schiller-Universität , Humboldtstr. 10 , 07743 Jena , Germany .
| | - Helmar Görls
- Institut für Anorganische Chemie und Analytische Chemie , Friedrich-Schiller-Universität , Humboldtstr. 8 , 07743 Jena , Germany
| | - Oliver Werz
- Institut für Pharmazie , Friedrich-Schiller-Universität , Philosophenweg 14 , 07743 Jena , Germany
| | - Dietmar Fischer
- Lehrstuhl für Zellphysiologie , Ruhr-Universität Bochum , Universitätsstr. 150, ND/4 , 44780 Bochum , Germany
| | - Hans-Dieter Arndt
- Institut für Organische Chemie und Makromolekulare Chemie , Friedrich-Schiller-Universität , Humboldtstr. 10 , 07743 Jena , Germany .
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Nagata A, Akagi Y, Masoud SS, Yamanaka M, Kittaka A, Uesugi M, Odagi M, Nagasawa K. Stereoselective Synthesis of Four Calcitriol Lactone Diastereomers at C23 and C25. J Org Chem 2019; 84:7630-7641. [DOI: 10.1021/acs.joc.9b00403] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akiko Nagata
- Department of Biotechnology and Life Science, Graduate School of Technology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei City 184-8588,
Tokyo, Japan
| | - Yusuke Akagi
- Department of Biotechnology and Life Science, Graduate School of Technology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei City 184-8588,
Tokyo, Japan
| | - Shadi Sedghi Masoud
- Department of Biotechnology and Life Science, Graduate School of Technology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei City 184-8588,
Tokyo, Japan
| | - Masahiro Yamanaka
- Department of Chemistry, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku 171-8501, Tokyo, Japan
| | - Atsushi Kittaka
- Faculty of Pharmaceutical Sciences, Teikyo University, 2-11-1 Kaga, Itabashi 173-8605, Tokyo, Japan
| | | | - Minami Odagi
- Department of Biotechnology and Life Science, Graduate School of Technology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei City 184-8588,
Tokyo, Japan
| | - Kazuo Nagasawa
- Department of Biotechnology and Life Science, Graduate School of Technology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei City 184-8588,
Tokyo, Japan
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