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Kuriyama Y, Sasano Y, Iwabuchi Y. Azetidine synthesis by La(OTf) 3-catalyzed intramolecular regioselective aminolysis of cis-3,4-epoxy amines. Front Chem 2023; 11:1251299. [PMID: 37795386 PMCID: PMC10546187 DOI: 10.3389/fchem.2023.1251299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Accepted: 08/22/2023] [Indexed: 10/06/2023] Open
Abstract
Azetidine is a prevalent structural motif found in various biologically active compounds. In this research paper, we report La(OTf)3-catalyzed intramolecular regioselective aminolysis of cis-3,4-epoxy amines to afford azetidines. This reaction proceeded in high yields even in the presence of acid-sensitive and Lewis basic functional groups.
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Affiliation(s)
| | | | - Yoshiharu Iwabuchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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Kuriyama Y, Sasano Y, Hoshino Y, Uesugi SI, Yamaichi A, Iwabuchi Y. Highly Regioselective 5-endo-tet Cyclization of 3,4-Epoxy Amines into 3-Hydroxypyrrolidines Catalyzed by La(OTf) 3. Chemistry 2021; 27:1961-1965. [PMID: 33191563 DOI: 10.1002/chem.202004455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/27/2020] [Indexed: 11/08/2022]
Abstract
Highly regioselective intramolecular aminolysis of 3,4-epoxy amines has been achieved. Key features of this reaction are (1) chemoselective activation of epoxides in the presence of unprotected aliphatic amines in the same molecules by a La(OTf)3 catalyst and (2) excellent regioselectivity for anti-Baldwin 5-endo-tet cyclization. This reaction affords 3-hydroxy-2-alkylpyrrolidines stereospecifically in high yields. DFT calculations revealed that the regioselectivity might be attributed to distortion energies of epoxy amine substrates. The use of this reaction was demonstrated by the first enantioselective synthesis of an antispasmodic agent prifinium bromide.
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Affiliation(s)
- Yuse Kuriyama
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
| | - Yusuke Sasano
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
| | - Yoshihiko Hoshino
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
| | - Shun-Ichiro Uesugi
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
| | - Aoto Yamaichi
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
| | - Yoshiharu Iwabuchi
- Department of Organic Chemistry, Graduate School of, Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
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Sakata J, Akita K, Sato M, Shimomura M, Tokuyama H. Cyclic Sulfamidite as Simultaneous Protecting Group for Amino Alcohols: Development of a Mild Deprotection Protocol Using Thiophenol. Chem Pharm Bull (Tokyo) 2020; 68:996-1000. [PMID: 32999152 DOI: 10.1248/cpb.c20-00531] [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: 11/22/2022]
Abstract
This study describes the novel utility of cyclic sulfamidite as a simultaneous protecting group for 1,2- or 1,3-amino alcohols. An exceptionally mild and neutral condition for the removal of the cyclic sulfamidite was developed. The deprotection condition demonstrated a broad range of functional-group compatibility, including a substrate bearing a Z-enyne structure without any loss of double-bond stereochemistry.
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Affiliation(s)
- Juri Sakata
- Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Kazunari Akita
- Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Manabu Sato
- Graduate School of Pharmaceutical Sciences, Tohoku University
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Nakamura D, Sasano Y, Iwabuchi Y. Ln(OTf) 3-catalysed highly regioselective alcoholysis of 2,3-epoxy alcohols. Org Biomol Chem 2019; 17:3581-3589. [PMID: 30901005 DOI: 10.1039/c8ob02448k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Regioselectivity of Ln(OTf)3-catalysed alcoholysis of 2,3- and 3,4-epoxy alcohols was closely investigated to expand the scope of the transformations. The synthetic use was demonstrated by application to the construction of 4-propoxy-5-hydroxy-2,3-pentanedione (C4-propoxy-HPD), which is a potent synthetic mediator in AI-2 quorum sensing.
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Affiliation(s)
- Daichi Nakamura
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
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