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Dey R, Jang DJ, Rhee YH. Formal Synthesis of (+)-Sinefungin by Way of Sequential Asymmetric Metal Catalysis. Org Lett 2024; 26:3957-3960. [PMID: 38683026 DOI: 10.1021/acs.orglett.4c01196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
Here, we report a de novo approach toward (+)-sinefungin, a potent inhibitor of the physiological methyl transfer process. A key feature is represented by the sequential metal catalysis combining Pd-catalyzed hydroalkoxylation and ring-rearrangement metathesis. The unique advantage of the method is highlighted by the unprecedented complete control of the C6 stereocenter.
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Affiliation(s)
- Raghunath Dey
- Department of Chemistry, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, Kyungbuk 37673, Republic of Korea
| | - Dong-Jin Jang
- Department of Chemistry, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, Kyungbuk 37673, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, Kyungbuk 37673, Republic of Korea
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2
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Lee S, Rhee YH. Total Synthesis of the Purported Structure of Branched Resin Glycosides Merremoside G and H 2. Org Lett 2024; 26:602-606. [PMID: 38206072 DOI: 10.1021/acs.orglett.3c03808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
The first total synthesis of the purported structure of branched resin glycosides merremoside G and H2 is accomplished. A signature step is represented by the sequential transition-metal-catalyzed coupling of stable trisaccharide homoallylic alcohol and monosaccharide alkoxyallene to afford the pentasaccharide skeleton. This de novo strategy is conducted under mild conditions with no need of preactivation. In addition, it allows for efficient preparation of the target compounds in combination with late-stage functionalization.
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Affiliation(s)
- Sukhyun Lee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-Ro 77, Nam-Gu, Pohang, Kyeongbuk 37673, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-Ro 77, Nam-Gu, Pohang, Kyeongbuk 37673, Republic of Korea
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3
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Kang J, Rhee YH. Synthesis of the Tetrasaccharide Glycone Part of Tetrocarcin A. J Org Chem 2023. [PMID: 36812358 DOI: 10.1021/acs.joc.2c02832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
A de novo synthesis of the tetrasaccharide fragment of tetrocarcin A is described. The key feature of this approach is highlighted by the regio- and diastereoselective Pd-catalyzed hydroalkoxylation of ene-alkoxyallenes with an unprotected l-digitoxose glycoside. The subsequent reaction with digitoxal in combination with chemoselective hydrogenation generated the target molecule.
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Affiliation(s)
- Jihun Kang
- Department of Chemistry, POSTECH, 77 Cheongam-Ro, Nam-Gu, Pohang, Kyungbuk Republic of Korea 37673
| | - Young Ho Rhee
- Department of Chemistry, POSTECH, 77 Cheongam-Ro, Nam-Gu, Pohang, Kyungbuk Republic of Korea 37673
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4
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Han S. “
K‐synthesis
”: Recent advancements in natural product synthesis enabled by unique methods and strategies development in Korea. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sunkyu Han
- Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea
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5
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Jang DJ, Lee S, Lee J, Moon D, Rhee YH. Palladium-Catalyzed Asymmetric Decarboxylative Addition of β-Keto Acids to Heteroatom-Substituted Allenes. Angew Chem Int Ed Engl 2021; 60:22166-22171. [PMID: 34278680 DOI: 10.1002/anie.202107990] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 11/06/2022]
Abstract
The Pd-catalyzed asymmetric addition reaction of β-keto acids to heteroatom-substituted allene is reported. This reaction generates β-substituted ketones in an asymmetric manner through a branch-selective decarboxylative allylation pathway. The reaction accommodates various alkoxyallenes as well as amidoallenes.
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Affiliation(s)
- Dong-Jin Jang
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-ro 77, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Sukhyun Lee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-ro 77, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Juyeol Lee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-ro 77, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Dohyun Moon
- Beamline Department, Pohang Accelerator Laboratory, 80 Jigokro-127-beongil, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-ro 77, Nam-gu, Pohang, Gyeongbuk, 37673, Republic of Korea
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6
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Jang D, Lee S, Lee J, Moon D, Rhee YH. Palladium‐Catalyzed Asymmetric Decarboxylative Addition of β‐Keto Acids to Heteroatom‐Substituted Allenes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107990] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Dong‐Jin Jang
- Department of Chemistry Pohang University of Science and Technology Cheongam-ro 77, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
| | - Sukhyun Lee
- Department of Chemistry Pohang University of Science and Technology Cheongam-ro 77, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
| | - Juyeol Lee
- Department of Chemistry Pohang University of Science and Technology Cheongam-ro 77, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
| | - Dohyun Moon
- Beamline Department Pohang Accelerator Laboratory 80 Jigokro-127-beongil, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry Pohang University of Science and Technology Cheongam-ro 77, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
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7
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Barpuzary B, Kim M, Rhee YH. Synthetic Study toward Saccharomicin Based upon Asymmetric Metal Catalysis. Org Lett 2021; 23:5969-5972. [PMID: 34292756 DOI: 10.1021/acs.orglett.1c02060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here, we report a de novo metal-catalyzed approach toward the stereoselective glycosidic bond formation in saccharomicin. The signature step is highlighted by the Pd-catalyzed asymmetric coupling of ene-alkoxyallenes and highly functionalized alcohol substrates. The reaction showed high chemo-, regio-, and ligand-driven diastereoselectivity. In combination with the ring-closing metathesis and late-stage functionalization, this method led to highly efficient synthesis of saccharosamine-rhamnose and rhamnose-fucose fragments.
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Affiliation(s)
- Bhawna Barpuzary
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Hyoja-dong San 31, Pohang 790-784, Republic of Korea
| | - Mijin Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Hyoja-dong San 31, Pohang 790-784, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Hyoja-dong San 31, Pohang 790-784, Republic of Korea
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8
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Abstract
A new synthetic approach toward oligosaccharides consisting only of 2,3,6-trideoxypyranoglycosides is reported. The key feature is highlighted by the convergent approach that allows the introduction of the aglycon moiety in the late stage of the synthesis. As an illustrative example, the tetrasaccharide portion of cervimycin K was prepared as cyclohexyl glycoside.
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Affiliation(s)
- Jihun Kang
- Department of Chemistry, POSTECH, 77 Cheongam-Ro, Nam-Gu, Pohang, Kyungbuk, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, POSTECH, 77 Cheongam-Ro, Nam-Gu, Pohang, Kyungbuk, Republic of Korea
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