1
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Kawabata T. Novel Strategies for Enantio- and Site-Selective Molecular Transformations. Chem Pharm Bull (Tokyo) 2023; 71:466-484. [PMID: 37394594 DOI: 10.1248/cpb.c23-00219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
A strategy for symmetric synthesis based on dynamic chirality of enolates (memory of chirality) has been developed. Asymmetric alkylation, conjugate addition, aldol reaction, and arylation via C-N axially chiral enolate intermediates are described. Asymmetric alkylation and conjugate addition via C-O axially chiral enolate intermediates with a half-life of racemization as short as approx. 1 s. at -78 °C have been accomplished. Organocatalysts for asymmetric acylation and site-selective acylation have been developed. Kinetic resolution of racemic alcohols via remote asymmetric induction by the catalyst is shown. Catalyst-controlled site-selective acylation of carbohydrates and its application to total synthesis of natural glycoside are described. Chemo-selective monoacylation of diols and selective acylation of secondary alcohols with reversal of inherent reactivity are also discussed. Geometry-selective acylation of tetrasubstituted alkene diols is achieved, where acylation takes place independent from the steric environments of the substrates.
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2
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Fallek R, Ashush N, Fallek A, Fleischer O, Portnoy M. Controlling the Site Selectivity in Acylations of Amphiphilic Diols: Directing the Reaction toward the Apolar Domain in a Model Diol and the Midecamycin A 1 Macrolide Antibiotic. J Org Chem 2022; 87:9688-9698. [PMID: 35801540 PMCID: PMC9361358 DOI: 10.1021/acs.joc.2c00745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Seeking to improve the site selectivity of acylation
of amphiphilic
diols, which is induced by imidazole-based nucleophilic catalysts
and directs the reaction toward apolar sites, as we recently reported,
we examined a new improved catalytic design and an alteration of the
acylating agent. The new catalysts performed slightly better selectivity-wise
in the model reaction, compared to the previous set, but notably could
be prepared in a much more synthetically economic way. The change
of the acylating agent from anhydride to acyl chloride, particularly
in combination with the new catalysts, accelerated the reaction and
increased the selectivity in favor of the apolar site. The new selectivity-inducing
techniques were applied to midecamycin, a natural amphiphilic antibiotic
possessing a secondary alcohol moiety in each of its two domains,
polar as well as apolar. In the case of the anhydride, a basic dimethylamino
group, decorating this substrate, overrides the catalyst’s
selectivity preference and forces selective acylation of the alcohol
in the polar domain with a more than 91:1 ratio of the monoacylated
products. To counteract the internal base influence, an acid additive
was used or the acylating agent was changed to acyl chloride. The
latter adjustment leads, in combination with our best catalyst, to
the reversal of the ratio between the products to 1:11.
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Affiliation(s)
- Reut Fallek
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Natali Ashush
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Amit Fallek
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Or Fleischer
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Moshe Portnoy
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
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3
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Hashimoto H, Ueda Y, Takasu K, Kawabata T. Catalytic Substrate‐Selective Silylation of Primary Alcohols via Remote Functional‐Group Discrimination. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114118] [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)
- Hisashi Hashimoto
- Institute for Chemical Research Kyoto University Gokasho Uji city Kyoto 611-0011 Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research Kyoto University Gokasho Uji city Kyoto 611-0011 Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida Kyoto, Sakyo-ku 606-8501 Kyoto Japan
| | - Takeo Kawabata
- Institute for Chemical Research Kyoto University Gokasho Uji city Kyoto 611-0011 Japan
- Current address: Department of Pharmaceutical Sciences International University of Health and Welfare 137-1 Enokizu Okawa Fukuoka 831-8501 Japan
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4
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Hashimoto H, Ueda Y, Takasu K, Kawabata T. Catalytic Substrate-Selective Silylation of Primary Alcohols via Remote Functional-Group Discrimination. Angew Chem Int Ed Engl 2021; 61:e202114118. [PMID: 34942061 DOI: 10.1002/anie.202114118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 11/07/2022]
Abstract
Silylation of alcohols has generally been known to take place at the sterically most accessible less-hindered hydroxy group. However, we report here the catalyst-controlled substrate-selective silylation of primary alcohols, where the selectivity was controlled independent of the innate reactivity of the hydroxy group based on the steric environment. The chain-length-selective silylation of 1, n- amino alcohol derivatives was achieved, where 1,5-amino alcohol derivatives showed outstanding high reactivity in the presence of analogues with a shorter or longer chain length under catalyst-controlled conditions. A highly substrate-selective catalytic silylation of pentanol analogues was also developed, in which the remote functionality at C(5) from the reacting hydroxy groups was effectively discriminated on silylation.
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Affiliation(s)
- Hisashi Hashimoto
- Institute for Chemical Research, Kyoto University Gokasho, Uji city, Kyoto, 611-0011, Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University Gokasho, Uji city, Kyoto, 611-0011, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences, Kyoto University Yoshida Kyoto, Sakyo-ku, 606-8501, Kyoto, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University Gokasho, Uji city, Kyoto, 611-0011, Japan
- Current address: Department of Pharmaceutical Sciences, International University of Health and Welfare, 137-1 Enokizu, Okawa, Fukuoka, 831-8501, Japan
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5
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Enantioselective preparation of mechanically planar chiral rotaxanes by kinetic resolution strategy. Nat Commun 2021; 12:404. [PMID: 33452235 PMCID: PMC7811017 DOI: 10.1038/s41467-020-20372-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 11/24/2020] [Indexed: 12/20/2022] Open
Abstract
Asymmetric synthesis of mechanically planar chiral rotaxanes and topologically chiral catenanes has been a long-standing challenge in organic synthesis. Recently, an excellent strategy was developed based on diastereomeric synthesis of rotaxanes and catenanes with mechanical chirality followed by removal of the chiral auxiliary. On the other hand, its enantioselective approach has been quite limited. Here, we report enantioselective preparation of mechanically planar chiral rotaxanes by kinetic resolution of the racemates via remote asymmetric acylation of a hydroxy group in the axis component, which provides an unreacted enantiomer in up to >99.9% ee in 29% yield (the theoretical maximum yield of kinetic resolution of racemate is 50%). While the rotaxane molecules are expected to have conformational complexity, our original catalysts enabled to discriminate the mechanical chirality of the rotaxanes efficiently with the selectivity factors in up to 16. Since the discovery of mechanically planar chiral rotaxanes and topologically chiral catenanes, their asymmetric synthesis has been a long-standing challenge. Here, the authors report enantioselective preparation of mechanically planar chiral rotaxanes with up to 99.9% ee in 29% yield.
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6
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Thiyagarajan R, Begum Z, Seki C, Okuyama Y, Kwon E, Uwai K, Tokiwa M, Tokiwa S, Takeshita M, Nakano H. New small γ-turn type N-primary amino terminal tripeptide organocatalyst for solvent-free asymmetric aldol reaction of various ketones with aldehydes. RSC Adv 2021; 11:38925-38932. [PMID: 35493209 PMCID: PMC9044195 DOI: 10.1039/d1ra08635a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 11/30/2021] [Indexed: 01/18/2023] Open
Abstract
New small γ-turn type N-primary amino terminal tripeptides were synthesized and their functionality as an organocatalyst was examined in the asymmetric aldol reaction of various ketones with different aromatic aldehydes under solvent-free neat conditions to afford the desired chiral anti-aldol products in good to excellent chemical yields, diastereoselectivities and enantioselectivities (up to 99%, up to syn : anti/13 : 87 dr, up to 99% ee). New small γ-turn type N-primary amino terminal tripeptides were applied for the asymmetric aldol reaction of ketones with aldehydes under neat conditions to afford the chiral aldol products (up to 99%, up to syn : anti/13 : 87 dr, up to 99% ee).![]()
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Affiliation(s)
- Rajkumar Thiyagarajan
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan
| | - Zubeda Begum
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan
| | - Chigusa Seki
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan
| | - Yuko Okuyama
- Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-Ku, Sendai 981-8558, Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Sciences,Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-Ku, Sendai 981-8558, Japan
| | - Koji Uwai
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan
| | - Michio Tokiwa
- Tokiwakai Group, 62 Numajiri Tsuduri-Chou Uchigo, Iwaki 973-8053, Japan
| | - Suguru Tokiwa
- Tokiwakai Group, 62 Numajiri Tsuduri-Chou Uchigo, Iwaki 973-8053, Japan
| | | | - Hiroto Nakano
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan
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7
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Ueda Y, Kawabata T. Catalyst-Controlled Site-Selective Acylation and its Application to Unconventional Total Synthesis of Natural Glycosides. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.1138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Nishikawa Y, Takemoto K, Matsuda K, Tanaka R, Arashima A, Ito K, Kamezawa Y, Hori Y, Hara O. Metal Template Assisted Proximal Arrangement of a Nucleophile and an Electrophile: Site-Selective Acylation of α-Hydroxyamides in Polyols. Org Lett 2018; 20:3367-3371. [PMID: 29790765 DOI: 10.1021/acs.orglett.8b01288] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Site-selective acylation of α-hydroxyl groups in amides has been achieved in the presence of other primary hydroxyl groups with intrinsic high reactivity. In this methodology, a relatively stable pyridine aldoxime ester was exploited as an acyl donor to suppress undesired acylation. The catalytic activation of a pyridine aldoxime ester with a Lewis acid produced a cationic complex, which preferentially attracted the Lewis basic α-hydroxyamide via a template effect, to thus facilitate o-acylation.
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Affiliation(s)
- Yasuhiro Nishikawa
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Kohei Takemoto
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Kana Matsuda
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Risa Tanaka
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Akira Arashima
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Kanako Ito
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Yuki Kamezawa
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Yuna Hori
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
| | - Osamu Hara
- Faculty of Pharmacy , Meijo University , 150 Yagotoyama, Tempaku-ku , Nagoya , Aichi 468-8503 , Japan
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9
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Huang L, Gong J, Zhu Z, Wang Y, Guo S, Cai H. Selective Phosphoramidation and Phosphonation of Benzoxazoles via Sequence Control. Org Lett 2017; 19:2242-2245. [DOI: 10.1021/acs.orglett.7b00726] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ling Huang
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
| | - Jiuhan Gong
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
| | - Zheng Zhu
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
| | - Yufeng Wang
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
| | - Shengmei Guo
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
| | - Hu Cai
- Department of Chemistry, Nanchang University, No. 999, Xuefu Road Nanchang 330031, P. R. China
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10
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Mishiro K, Takeuchi H, Furuta T, Kawabata T. A Concise Access to C2-Symmetric Chiral 4-Pyrrolidinopyridine Catalysts with Dual Functional Side Chains. Chem Pharm Bull (Tokyo) 2016; 64:1073-7. [PMID: 27150597 DOI: 10.1248/cpb.c16-00292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A practical method was developed for the preparation of a diastereomeric library of C2-symmetric chiral 4-pyrrolidinopyridine catalysts with dual amide side chains. Use of a racemic precursor is the key to the concise production of catalysts with diverse stereochemisty.
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11
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Li Z, Yazaki R, Ohshima T. Chemo- and Regioselective Direct Functional Group Installation through Catalytic Hydroxy Group Selective Conjugate Addition of Amino Alcohols to α,β-Unsaturated Sulfonyl Compounds. Org Lett 2016; 18:3350-3. [PMID: 27358161 DOI: 10.1021/acs.orglett.6b01464] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A chemoselective functional group installation through catalytic hydroxy group selective conjugate addition of amino alcohols to a variety of functionalized α,β-unsaturated sulfonyl derivatives was developed. Azide group installation for click chemistry and facile fluorescent labeling onto the less reactive hydroxy group demonstrated the synthetic utility of the present chemoselective catalysis. Moreover, chemo- and regioselective reaction of an unprotected amino diol was achieved for the first time.
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Affiliation(s)
- Zhao Li
- Graduate School of Pharmaceutical Sciences, Kyushu University , Fukuoka 812-8582, Japan
| | - Ryo Yazaki
- Graduate School of Pharmaceutical Sciences, Kyushu University , Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University , Fukuoka 812-8582, Japan
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12
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Yamada T, Suzuki K, Hirose T, Furuta T, Ueda Y, Kawabata T, Ōmura S, Sunazuka T. Organocatalytic Site-Selective Acylation of Avermectin B2a, a Unique Endectocidal Drug. Chem Pharm Bull (Tokyo) 2016; 64:856-64. [PMID: 27075247 DOI: 10.1248/cpb.c16-00205] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The organocatalytic site-selective monoacylation of avermectin B2a, an insecticidal and anti-parasitic drug, was accomplished. Although an acetylation of avermectin B2a using a 4-dimethylaminopyridine (DMAP) as a catalyst gave poor site-selectivity, use of our organocatalyst increased site-selectivity of the acylation at the C-5-OH as well as the yield of monoacetate. This catalyst was also effective in other acylations. Interestingly, trihaloacetylation under same conditions gave poor site-selectivity. However, the use of an enantiomer of our organocatalyst provided the C-4″-O-trihaloacetyl avermectin B2a with excellent site-selectivity. These results indicate that the site-selective acylation of avermectin B2a can be controlled by the combination of a suitable organocatalyst and an acid anhydride.
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Affiliation(s)
- Takeshi Yamada
- Kitasato Institute for Life Sciences, Kitasato University
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13
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Yamanaka M, Yoshida U, Sato M, Shigeta T, Yoshida K, Furuta T, Kawabata T. Origin of High E-Selectivity in 4-Pyrrolidinopyridine-Catalyzed Tetrasubstituted α,α′-Alkenediol: A Computational and Experimental Study. J Org Chem 2015; 80:3075-82. [DOI: 10.1021/jo5029453] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masahiro Yamanaka
- Department
of Chemistry and Research Center for Smart Molecules, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Urara Yoshida
- Department
of Chemistry and Research Center for Smart Molecules, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Makoto Sato
- Department
of Chemistry and Research Center for Smart Molecules, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Takashi Shigeta
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Keisuke Yoshida
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takeo Kawabata
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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14
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Organocatalytic Site-Selective Acylation of Carbohydrates and Polyol Compounds. SITE-SELECTIVE CATALYSIS 2015; 372:203-32. [DOI: 10.1007/128_2015_662] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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15
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Akagawa K, Nishi N, Sen J, Kudo K. Peptide-catalyzed consecutive 1,6- and 1,4-additions of thiols to α,β,γ,δ-unsaturated aldehydes. Org Biomol Chem 2014; 12:3581-5. [PMID: 24769865 DOI: 10.1039/c4ob00565a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Regio- and enantioselective addition of thiols to α,β,γ,δ-unsaturated aldehydes was performed with a resin-supported peptide catalyst. It was shown that a 1,4-adduct was generated mainly at the initial stage of the reaction, and this was eventually converted to a thermodynamically stable 1,6- and 1,4-diadduct through retro-addition/addition reactions.
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Affiliation(s)
- Kengo Akagawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
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16
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Akagawa K, Suzuki R, Kudo K. Development of a Peptide-Based Primary Aminocatalyst with a Helical Structure. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201400028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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17
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Akiyama M, Akagawa K, Seino H, Kudo K. Peptide-catalyzed kinetic resolution of planar-chiral metallocenes. Chem Commun (Camb) 2014; 50:7893-6. [DOI: 10.1039/c4cc03266g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Kinetic resolution of racemic planar-chiral metallocenes was performed by a resin-supported peptide catalyst, in which low-molecular-weight organocatalysts were not effective.
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Affiliation(s)
- Midori Akiyama
- Institute of Industrial Science
- University of Tokyo
- Tokyo 153-8505, Japan
| | - Kengo Akagawa
- Institute of Industrial Science
- University of Tokyo
- Tokyo 153-8505, Japan
| | - Hidetake Seino
- Faculty of Education and Human Studies
- Akita University
- Akita 010-8502, Japan
| | - Kazuaki Kudo
- Institute of Industrial Science
- University of Tokyo
- Tokyo 153-8505, Japan
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18
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Mishiro K, Furuta T, Sasamori T, Hayashi K, Tokitoh N, Futaki S, Kawabata T. A cyclochiral conformational motif constructed using a robust hydrogen-bonding network. J Am Chem Soc 2013; 135:13644-7. [PMID: 24007282 DOI: 10.1021/ja407051k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel conformational motif constructed with a robust intramolecular hydrogen-bonding (H-bonding) network was discovered. A pyrrolidine derivative possessing four identical amide substituents at C(2) and C(5) formed a strong intramolecular H-bonding network consisting of all the amide groups. This conformation yielded a cyclochiral structure with a handedness that depended on the directionality of the H-bonding network. The most stable compound was isolated and applied to the acylative kinetic resolution of secondary alcohol. The handedness of the H-bonding network was biased by the presence of chiral substituents, and the preferred direction could be switched under an external stimulus. A structural analysis using NMR, X-ray crystallography, and theoretical calculation techniques indicated that the conformation of the substituents was highly ordered and depended on the directionality of the H-bonding network.
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Affiliation(s)
- Kenji Mishiro
- Institute for Chemical Research, Kyoto University , Uji, Kyoto, 611-0011, Japan
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19
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Akagawa K, Sen J, Kudo K. Peptide-Catalyzed Regio- and Enantioselective Reduction of α,β,γ,δ-Unsaturated Aldehydes. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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20
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Akagawa K, Sen J, Kudo K. Peptide-Catalyzed Regio- and Enantioselective Reduction of α,β,γ,δ-Unsaturated Aldehydes. Angew Chem Int Ed Engl 2013; 52:11585-8. [DOI: 10.1002/anie.201305004] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Indexed: 12/25/2022]
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21
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Hamada S, Furuta T, Wada Y, Kawabata T. Chemoselective Oxidation by Electronically Tuned Nitroxyl Radical Catalysts. Angew Chem Int Ed Engl 2013; 52:8093-7. [DOI: 10.1002/anie.201302261] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Indexed: 11/10/2022]
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22
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Hamada S, Furuta T, Wada Y, Kawabata T. Chemoselective Oxidation by Electronically Tuned Nitroxyl Radical Catalysts. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302261] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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23
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Schedel H, Kan K, Ueda Y, Mishiro K, Yoshida K, Furuta T, Kawabata T. Asymmetric desymmetrization of meso-diols by C(2)-symmetric chiral 4-pyrrolidinopyridines. Beilstein J Org Chem 2012; 8:1778-87. [PMID: 23209512 PMCID: PMC3511012 DOI: 10.3762/bjoc.8.203] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 09/06/2012] [Indexed: 11/23/2022] Open
Abstract
In this work we developed C2-symmetric chiral nucleophilic catalysts which possess a pyrrolidinopyridine framework as a catalytic site. Some of these organocatalysts effectively promoted asymmetric desymmetrization of meso-diols via enantioselective acylation.
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Affiliation(s)
- Hartmut Schedel
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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Akagawa K. Catalytic Reactions for Controlling Regioselectivity. J SYN ORG CHEM JPN 2012. [DOI: 10.5059/yukigoseikyokaishi.70.1305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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