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1
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Mino T, Takaya K, Koki K, Akimoto N, Yoshida Y, Kasashima Y, Sakamoto M. Axially chiral N-alkyl- N-cinnamoyl amide type P,olefin ligands for Pd-catalyzed reactions. Org Biomol Chem 2023; 21:2775-2778. [PMID: 36920143 DOI: 10.1039/d3ob00224a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
Abstract
We synthesized N-alkyl-N-cinnamoyl amide type phosphine-olefin compounds 1 and found axial chirality in a C(aryl)-N(amide) bond in compounds 1 by HPLC analysis using a chiral stationary phase column. We successfully obtained enantiomeric isomers of 1 and demonstrated the use of (-)-1 for chiral ligands in Pd-catalyzed asymmetric allylic substitution reactions of allylic esters with indoles (up to 97% ee).
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Affiliation(s)
- Takashi Mino
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.,Soft Molecular Activation Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Kaho Takaya
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Kaito Koki
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Natsume Akimoto
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Yasushi Yoshida
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.,Soft Molecular Activation Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Yoshio Kasashima
- Education Center, Chiba Institute of Technology, Shibazono 2-2-1, Narashino, Chiba 275-0023, Japan
| | - Masami Sakamoto
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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3
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Mino T, Fujisawa Y, Yoshida S, Hirama M, Akiyama T, Saito R, Yoshida Y, Kasashima Y, Sakamoto M. Cinnamoyl amide type chiral P,olefin ligands for Pd-catalyzed reactions. Org Biomol Chem 2021; 19:10385-10389. [PMID: 34821903 DOI: 10.1039/d1ob02086b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We synthesized cinnamoyl amide type chiral P,olefin ligand (S)-4. We successfully obtained separable diastereomers of 4d and demonstrated Pd-catalyzed asymmetric allylic substitution reactions of indoles using (S,aS)-4d as a chiral ligand with high enantioselectivities (up to 98% ee).
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Affiliation(s)
- Takashi Mino
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.,Soft Molecular Activation Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Yohei Fujisawa
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Shizuki Yoshida
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Mitsuru Hirama
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Takumu Akiyama
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Ryo Saito
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Yasushi Yoshida
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.,Soft Molecular Activation Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Yoshio Kasashima
- Education Center, Chiba Institute of Technology, Shibazono 2-2-1, Narashino, Chiba 275-0023, Japan
| | - Masami Sakamoto
- Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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4
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Mino T, Yamaguchi D, Masuda C, Youda J, Ebisawa T, Yoshida Y, Sakamoto M. Synthesis and application of P,olefin type axially chiral ligands with sec-alkyl groups. Org Biomol Chem 2019; 17:1455-1465. [DOI: 10.1039/c9ob00075e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Palladium-catalyzed asymmetric allylic substitution with indoles using a chiral ligand 3b, which have fewer hindered substituents such as secondary alkyl groups than 1-adamantyl group, gave desired products (R)-9 with high enantioselectivities (up to 96% ee).
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Affiliation(s)
- Takashi Mino
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
- Molecular Chirality Research Center
| | - Daiki Yamaguchi
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Chihiro Masuda
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Junpei Youda
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | | | - Yasushi Yoshida
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
- Molecular Chirality Research Center
| | - Masami Sakamoto
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
- Molecular Chirality Research Center
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