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Yamada K, Kondo Y, Kitamura A, Kadota T, Morimoto H, Ohshima T. Organocatalytic Direct Enantioselective Hydrophosphonylation of N-Unsubstituted Ketimines for the Synthesis of α-Aminophosphonates. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- Koki Yamada
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Akihiko Kitamura
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Tetsuya Kadota
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
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Kondo Y, Hirazawa Y, Kadota T, Yamada K, Morisaki K, Morimoto H, Ohshima T. One-Pot Catalytic Synthesis of α-Tetrasubstituted Amino Acid Derivatives via In Situ Generation of N-Unsubstituted Ketimines. Org Lett 2022; 24:6594-6598. [PMID: 36053018 DOI: 10.1021/acs.orglett.2c02587] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A one-pot catalytic synthesis of α-tetrasubstituted amino acid derivatives via in situ generation of N-unsubstituted ketimines is reported. Because of the irreversible formation of N-unsubstituted ketimines, the yields were higher than those generated under the conventional one-pot reaction conditions. This process prevents the need to isolate unstable N-unsubstituted ketimines with alkyl substituents and streamlines the synthesis of highly congested α-amino acid derivatives.
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Affiliation(s)
- Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Yoshinobu Hirazawa
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Tetsuya Kadota
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Koki Yamada
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kazuhiro Morisaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
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Morimoto H. Development of Greener Catalytic Synthetic Methods of Nitrogen-Containing Compounds Using <i>N</i>-Unprotected Ketimines. J SYN ORG CHEM JPN 2022. [DOI: 10.5059/yukigoseikyokaishi.80.2] [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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Kadota T, Sawa M, Kondo Y, Morimoto H, Ohshima T. Catalytic Enantioselective Strecker Reaction of Isatin-Derived N-Unsubstituted Ketimines. Org Lett 2021; 23:4553-4558. [PMID: 34029103 DOI: 10.1021/acs.orglett.1c01194] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A catalytic enantioselective Strecker reaction of isatin-derived N-unsubstituted ketimines directly afforded the N-unprotected α-aminonitriles with a tetrasubstituted carbon stereocenter in up to 99% ee without requiring protection/deprotection steps. One-pot Strecker reactions from the parent carbonyl compounds were also realized with comparable yields and enantioselectivities. Direct transformations of the N-unprotected α-aminonitrile products streamlined the synthesis of unnatural amino acid derivatives and achieved the shortest one-pot stereoselective routes to a biologically active compound reported to date.
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Affiliation(s)
- Tetsuya Kadota
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Masanao Sawa
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi 3-1-1 Higashi-ku, Fukuoka 812-8582, Japan
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Shibata S, Masui Y, Onaka M. Efficient solvent-free synthesis of N-unsubstituted ketimines from ketones and ammonia on porous solid acids. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Morisaki K, Morimoto H, Ohshima T. Recent Progress on Catalytic Addition Reactions to N-Unsubstituted Imines. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01212] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kazuhiro Morisaki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hiroyuki Morimoto
- 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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Kondo Y, Morimoto H, Ohshima T. Recent Progress towards the Use of Benzophenone Imines as an Ammonia Equivalent. CHEM LETT 2020. [DOI: 10.1246/cl.200099] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Yonesaki R, Kusagawa I, Morimoto H, Hayashi T, Ohshima T. Rhodium(I)/Chiral Diene‐Catalyzed Enantioselective Addition of Boronic Acids to
N
‐Unsubstituted Isatin‐Derived Ketimines. Chem Asian J 2020; 15:499-502. [DOI: 10.1002/asia.201901745] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Ryohei Yonesaki
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi 3-1-1 Higashi-ku Fukuoka 812-8582 Japan
| | - Ibuki Kusagawa
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi 3-1-1 Higashi-ku Fukuoka 812-8582 Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi 3-1-1 Higashi-ku Fukuoka 812-8582 Japan
| | - Tamio Hayashi
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Takashi Ohshima
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi 3-1-1 Higashi-ku Fukuoka 812-8582 Japan
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Kondo Y, Kadota T, Hirazawa Y, Morisaki K, Morimoto H, Ohshima T. Scandium(III) Triflate Catalyzed Direct Synthesis of N-Unprotected Ketimines. Org Lett 2019; 22:120-125. [PMID: 31854997 DOI: 10.1021/acs.orglett.9b04038] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
N-Unprotected ketimines are useful substrates and intermediates for synthesizing valuable nitrogen-containing compounds, but their potential applicability is limited by the available synthetic methods. To address this issue, we report a scandium(III) triflate catalyzed direct synthesis of N-unprotected ketimines. Using commercially available reagents and Lewis acid catalysts, ketones were directly transformed into the corresponding N-unprotected ketimines in high yields with broad functional group tolerance, even in multigram scales. The reactions were readily applicable for one-pot synthesis of important compounds such as a glycine Schiff base without isolation of N-unprotected ketimine intermediates. Preliminary mechanistic studies to clarify the reaction mechanism are also described.
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Affiliation(s)
- Yuta Kondo
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
| | - Tetsuya Kadota
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
| | - Yoshinobu Hirazawa
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
| | - Kazuhiro Morisaki
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences , Kyushu University , Maidashi 3-1-1 Higashi-ku , Fukuoka , Japan , 812-8582
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