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Sugano M, Inokuma T, Yamaoka Y, Yamada KI. 5- exo-Selective asymmetric bromolactonization of stilbenecarboxylic acids catalyzed by phenol-bearing chiral thiourea. Org Biomol Chem 2024; 22:1765-1769. [PMID: 38099597 DOI: 10.1039/d3ob01895d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
We developed a novel thiourea Lewis-base catalyst with phenol moieties for the enantioselective 5-exo-bromolactonization of stilbenecarboxylic acids to afford chiral 3-substituted phthalides. The phenol moieties are crucial for the enantio- and regio-selectivity.
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Affiliation(s)
- Masayuki Sugano
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development, " Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development, " Tokushima University, Shomachi, Tokushima 770-8505, Japan
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Inokuma T, Iritani K, Takahara Y, Sun C, Yamaoka Y, Kuwano S, Yamada KI. Remote electronic effect on the N-heterocyclic carbene-catalyzed asymmetric intramolecular Stetter reaction and structural revision of products. Chem Commun (Camb) 2023; 59:5375-5378. [PMID: 36939087 DOI: 10.1039/d3cc00693j] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
The remote electronic effects of chiral N-heterocyclic carbene catalysts on the asymmetric intramolecular Stetter reaction are investigated. The reaction rate and enantioselectivity were markedly influenced by a substituent at a remote position of the catalyst. The absolute configurations of the products are revised on the basis of X-ray diffraction. Density-functional theory calculations rationalize the improvement of the enantioselectivity using an electron-deficient catalyst.
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Affiliation(s)
- Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Kohei Iritani
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yuki Takahara
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Chunzhao Sun
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Satoru Kuwano
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
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3
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Inokuma T, Masui K, Fukuhara K, Yamada KI. Preparation of N-2-Nitrophenylsulfenyl Imino Peptides and Their Catalyst-Controlled Diastereoselective Indolylation. Chemistry 2023; 29:e202203120. [PMID: 36369610 DOI: 10.1002/chem.202203120] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/10/2022] [Accepted: 11/11/2022] [Indexed: 11/13/2022]
Abstract
N-2-Nitrophenylsulfenyl imino dipeptides bearing various functional groups were successfully prepared by MnO2 -mediated oxidation and then subjected to diastereoselective indolylation. Each diastereomer of the adduct was selectively obtained from the same substrates using the appropriate chiral phosphoric acid catalysts. These transformations would be useful for synthesizing non-canonical amino acid-containing peptides as novel drug candidates.
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Affiliation(s)
- Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan.,Research Cluster on "Key Material Development", Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Kana Masui
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Koki Fukuhara
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan.,Research Cluster on "Key Material Development", Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
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Wang YJ, Wang YF, Kang WY, Lu WY, Wang YH, Tian P. A Highly Enantioselective Homoenolate Michael Addition/Esterification Sequence of Cyclohexadienone-Tethered Enals via NHC Catalysis. Org Lett 2023; 25:630-635. [PMID: 36662291 DOI: 10.1021/acs.orglett.2c04183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Reported here is a highly enantioselective homoenolate Michael addition/esterification sequence of cyclohexadienone-tethered enals via N-heterocyclic carbene (NHC) catalysis, affording the enantiopure cis-hydrobenzofurans, cis-hydroindoles, and cis-hydroindenes. The NHC catalyst bearing a nitro group greatly enhances the stereocontrol, and a bulky N-aryl substituent of the triazolium salt in the catalyst is helpful for inhibiting the further aldol condensation after homoenolate Michael addition. The utility of this protocol is highlighted by a gram-scale experiment and versatile downstream transformations.
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Affiliation(s)
- Ya-Jie Wang
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Yi-Fan Wang
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Wen-Yu Kang
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Wen-Ya Lu
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Yu-Hui Wang
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Ping Tian
- The Research Center of Chiral Drugs, Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
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5
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Yamada KI, Yamauchi A, Fujiwara T, Hashimoto K, Wang Y, Kuwano S, Inokuma T. Kinetic Resolution of α‐Hydroxyamide via N‐Heterocyclic Carbene‐Catalyzed Acylation. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ken-ichi Yamada
- Tokushima University Graduate School of Pharmaceutical Sciences Shomachi 770-8505 Tokushima JAPAN
| | - Akiho Yamauchi
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Tatsuya Fujiwara
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Keiji Hashimoto
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Yinli Wang
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Satoru Kuwano
- Kyoto University: Kyoto Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Tsubasa Inokuma
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
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