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Kinouchi H, Sugimoto K, Yamaoka Y, Takikawa H, Takasu K. Oxidative β-Cleavage of Fused Cyclobutanols Leading to Hydrofuran-Fused Polycyclic Aromatic Compounds. J Org Chem 2021; 86:12615-12622. [PMID: 34474562 DOI: 10.1021/acs.joc.1c01108] [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
Treatment of aryl-fused bicyclo[4.2.0]octanols with an oxidant such as phenyliodine diacetate (PIDA) or hypochlorous acid gave dihydrofuran-containing polycyclic aromatic compounds by selective β-cleavage of the cyclobutanol moiety. Mechanistic studies suggest that the oxygen atom of the hydrofuran ring is incorporated from the hydroxy group of the substrate via intramolecular addition. The oxidative transformation should serve as a new method to prepare functionalized polycyclic aromatic compounds.
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Affiliation(s)
- Hayate Kinouchi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuma Sugimoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroshi Takikawa
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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Li J, Huo H, Yang F, Zhou Q, Li M, Chen ZS, Ji K. Gold( iii)-catalyzed bicyclizations of alkylidenecyclopropane-tethered ynones for divergent synthesis of indene and naphthalenone-based polycycles. Org Chem Front 2021. [DOI: 10.1039/d1qo00821h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A gold(iii)-catalyzed cascade oxidation/cyclization of alkylidenecyclopropane-tethered ynones for the assembly of indene and naphthalenone-based polycycles by employing different N-oxides is reported.
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Affiliation(s)
- Jian Li
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
- College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Haibo Huo
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fang Yang
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
| | - Qianqian Zhou
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
| | - Mengxue Li
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
| | - Zi-Sheng Chen
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
| | - Kegong Ji
- College of Chemistry and Pharmacy, Northwest A&F University, Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, Shaanxi 712100, China
- Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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Shimoda K, Yamaoka Y, Yoo D, Yamada KI, Takikawa H, Takasu K. Total Syntheses of Allelopathic 4-Oxyprotoilludanes, Melleolides, and Echinocidins. J Org Chem 2019; 84:11014-11024. [PMID: 31403293 DOI: 10.1021/acs.joc.9b01589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Stereocontrolled total syntheses of allelopathic 4-oxyprotoilludane sesquiterpenes, melleolide, melleolide F, and echinocidins B and D were achieved. The curved 5/6/4 tricyclic system with an angular hydroxy group was built via three key transformations: (1) Me3Al-catalyzed [2 + 2] cycloaddition of a ketene silyl acetal with a propiolate, (2) reductive ring-opening of a cyclic hemiketal, and (3) the intramolecular Morita-Baylis-Hillman reaction. This synthetic route represents a new and reliable strategy to obtain protoilludanes with several oxy-functional groups.
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Affiliation(s)
- Kazuma Shimoda
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Dongeun Yoo
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Hiroshi Takikawa
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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Takasu K, Yamaoka Y, Taniguchi M, Yamada KI. Total Synthesis of Phenanthroquinolizidine Alkaloid Cryptopleurine and Phenanthroindolizidine Alkaloid Tylophorine. HETEROCYCLES 2018. [DOI: 10.3987/com-18-s(t)19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Takasu K. Synthesis of Multisubstituted Silyloxy-based Donor-Acceptor Cyclobutanes by an Acid-Catalyzed [2+2] Cycloaddition. Isr J Chem 2016. [DOI: 10.1002/ijch.201500096] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida, Sakyo-ku Kyoto 606-8501 Japan
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Yoshii Y, Otsu T, Hosokawa N, Takasu K, Okano K, Tokuyama H. Synthetic studies toward penitrem E: enantiocontrolled construction of B–E rings. Chem Commun (Camb) 2015; 51:1070-3. [DOI: 10.1039/c4cc08505a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Enantiocontrolled construction of B–E rings of penitrem E was accomplished from 4-iodoindole through diastereoselective Tf2NH-catalyzed (2+2)-cycloaddition.
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Affiliation(s)
- Yu Yoshii
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Takanori Otsu
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Norihiko Hosokawa
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Kentaro Okano
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
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Nagamoto Y, Yamaoka Y, Fujimura S, Takemoto Y, Takasu K. Synthesis of functionalized polycyclic aromatic compounds via a formal [2 + 2]-cycloaddition. Org Lett 2014; 16:1008-11. [PMID: 24437688 DOI: 10.1021/ol403757e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A base-promoted formal [2 + 2]-cycloaddition of 2-acyl-2'-vinyl-1,1'-biaryls was developed to provide polycyclic cyclobutanols as a step toward the synthesis of substituted polycyclic aromatic hydrocarbons and their heterocyclic analogues.
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Affiliation(s)
- Yuuki Nagamoto
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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