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Matsuda Y, Koyama T, Kawano S, Miura K, Simizu S, Saikawa Y, Nakata M. Scalable Syntheses and Biological Evaluation of Africane-type Sesquiterpenoids. Chem Biodivers 2022; 19:e202100890. [PMID: 35018704 DOI: 10.1002/cbdv.202100890] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 01/11/2022] [Indexed: 11/05/2022]
Abstract
Practical total syntheses of africane-type sesquiterpenoids were realized by reexamination of a divergent strategy employing optimized three-component coupling followed by ring-closing metathesis and substrate-controlled cyclopropanation. This sequential eight-step conversion provided Δ9(15)-africanene, a common bicyclo[5.3.0]decane intermediate for the syntheses of africane derivatives, in more than twice the yield as in the previous approach. The scalability and robustness of this improved synthetic route were confirmed by gram-scale preparation of Δ9(15)-africanene. In vitro cell-based assays of the synthesized africane-type sesquiterpenoids disclosed that ester-incorporating derivatives showed cytotoxic activity against HeLa cells. The effect of relative and absolute stereochemistry of africane-9,15-diol monoacetates on the cytotoxicity against HeLa cells was also investigated.
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Affiliation(s)
- Yutaka Matsuda
- Keio University Faculty of Science and Technology Graduate School of Science and Technology: Keio Gijuku Daigaku Rikogakubu Daigakuin Rikogaku Kenkyuka, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
| | - Takayuki Koyama
- Keio University, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
| | - Sayaka Kawano
- Keio University: Keio Gijuku Daigaku, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
| | - Kazuki Miura
- Faculty of Science and Technology, Keio University, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
| | - Siro Simizu
- Faculty of Science of Technology, Keio University, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
| | - Yoko Saikawa
- Faculty of Science and Technology, Keio University, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, 223-8522, Yokohama, JAPAN
| | - Masaya Nakata
- Faculty of Science and Technology, Keio University, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, JAPAN
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Nassar Y, Piva O. Photoredox-catalyzed hydroxymethylation of β-ketoesters: application to the synthesis of [3.3.3] propellane lactones. Org Biomol Chem 2021; 19:9251-9259. [PMID: 34664603 DOI: 10.1039/d1ob01712h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoredox-catalysed hydroxymethylation of β-ketoesters substituted by an allyl subunit on the α-position afforded directly the corresponding bicyclic lactones possessing both a hydroxy group and an unsaturation. A subsequent regioselective iodoetherification led to the formation of original [3.3.3] propellane structures. Substitution of the iodine atom by various nucleophiles afforded highly functionnalized structures including triazolomethyl derivatives.
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Affiliation(s)
- Youssef Nassar
- Université de Lyon; CNRS; UCBL; UMR 5246 - Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, 43, Boulevard du 11 Novembre 1918-69622, Villeurbanne, France.
| | - Olivier Piva
- Université de Lyon; CNRS; UCBL; UMR 5246 - Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires, 43, Boulevard du 11 Novembre 1918-69622, Villeurbanne, France.
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