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Johnson DA, Mueller Hendrix AJ, Jennings MP. Diastereoselective Syntheses of (E)-α-Trialkylsilyl α,β-Unsaturated Esters, α-Silane-Substituted Conjugated Silyl Ketene Acetals, and α,γ-Substituted Allylsilanes. J Org Chem 2018; 83:9914-9928. [DOI: 10.1021/acs.joc.8b01209] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David A. Johnson
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Amanda J. Mueller Hendrix
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Michael P. Jennings
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
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Yang ZJ, Ge WZ, Li QY, Lu Y, Gong JM, Kuang BJ, Xi X, Wu H, Zhang Q, Chen Y. Syntheses and Biological Evaluation of Costunolide, Parthenolide, and Their Fluorinated Analogues. J Med Chem 2015; 58:7007-20. [PMID: 26226279 DOI: 10.1021/acs.jmedchem.5b00915] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Inspired by the biosynthesis of sesquiterpene lactones (SLs), herein we report the asymmetric total synthesis of the germacrane ring (24). The synthetic strategy features a selective aldol reaction between β,γ-unsaturated chiral sulfonylamide 15a and aldehyde 13, as well as the intramolecular α-alkylation of sulfone 21 to construct a 10-membered carbocylic ring. The key intermediate 24 can be used to prepare the natural products costunolide and parthenolide (PTL), which are the key precursors for transformation into other SLs. Furthermore, the described synthetic sequences are amenable to the total synthesis of SL analogues, such as trifluoromethylated analogues 32 and 45. Analogues 32 and 45 maintained high activities against a series of cancer cell lines compared to their parent PTL and costunolide, respectively. In addition, 32 showed enhanced tolerance to acidic media compared with PTL. To our surprise, PTL and 32 showed comparable half-lives in rat plasma and in the presence of human liver microsomes.
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Affiliation(s)
- Zhong-Jin Yang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Wei-Zhi Ge
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Qiu-Ying Li
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Yaxin Lu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Jian-Miao Gong
- Accendatech Company, Ltd. , Tianjin 300384, People's Republic of China
| | - Bei-Jia Kuang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Xiaonan Xi
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China.,Tianjin International Joint Academy of Biomedicine , Tianjin 300457, People's Republic of China
| | - Haiting Wu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China.,Tianjin International Joint Academy of Biomedicine , Tianjin 300457, People's Republic of China
| | - Quan Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Yue Chen
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
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7
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Green JR, Alo BI, Majewski M, Snieckus V. γ-Silylated α,β-unsaturated amides — Preparation by [1,5]-sigmatropic rearrangement and use as masked dienolate equivalents in carbonyl condensations. CAN J CHEM 2009. [DOI: 10.1139/v09-054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The reaction of lithium dienolates derived from N,N-dialkylsenecioamides (1a–1c) with triorganosilyl electrophiles occurs initially at the oxygen atom predominantly, and is followed by an O → C silicon migration to afford the γ-silylated senecioamides (4a–4h). The γ-silylated senecioamide Z-4a undergoes fluoride-ion-mediated condensations with aromatic aldehydes to give kinetic α-(6) and thermodynamic γ-(5) condensation product patterns comparable to lithium dienolates. The TiCl4-mediated reactions with aldehydes gives α-products (6) in a highly syn-selective manner. Possible transition-state models for the syn-selective condensations are discussed and a chair-like transition state featuring bidentate coordination to titanium (11) is proposed.
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Affiliation(s)
- James R. Green
- Department of Chemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
- Department of Chemistry, University of Waterloo, Waterloo, ON N21 3G1, Canada
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
| | - Babajide I. Alo
- Department of Chemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
- Department of Chemistry, University of Waterloo, Waterloo, ON N21 3G1, Canada
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
| | - Marek Majewski
- Department of Chemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
- Department of Chemistry, University of Waterloo, Waterloo, ON N21 3G1, Canada
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
| | - Victor Snieckus
- Department of Chemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
- Department of Chemistry, University of Waterloo, Waterloo, ON N21 3G1, Canada
- Department of Chemistry, University of Lagos, Akoka, Lagos, Nigeria
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
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