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A Greener Technique for Microwave-Assisted O-Silylation and Silyl Ether Deprotection of Uridine and Other Substrates. CHEMISTRY 2022. [DOI: 10.3390/chemistry4040112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A single clean, good-yielding, environment-friendly microwave-assisted procedure for O-silylation of uridine with tert-butyldimethylsilyl chloride (TBDMSCl), 1,8-Diazabicyclo(5.4.0)undec-7-ene (DBU) and potassium nitrate as catalyst under solvent-free conditions is reported. Subsequent silyl ether deprotection is accomplished with a reusable acidic resin via microwave irradiation. Both the silylation and desilylation protocols have been applied to a panel of alcohols of pharmaceutical interest.
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Mannino MP, Demchenko AV. Synthesis of β-Glucosides with 3-O-Picoloyl-Protected Glycosyl Donors in the Presence of Excess Triflic Acid: Defining the Scope. Chemistry 2020; 26:2938-2946. [PMID: 31886911 DOI: 10.1002/chem.201905278] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Indexed: 11/08/2022]
Abstract
Excellent β-stereoselectivity for the glycosylation with glucosyl donors equipped with the 3-O-picoloyl (Pico) group, without the use of participating group, was achieved in the presence of NIS/excess TfOH promoter system. A complete investigation of the scope of this reaction was performed, revealing all important attributes of successful glycosylation. While altering the halogen source was tolerated, substitution of the triflate anion resulted in complete loss of stereoselectivity. Protonation of the Pico group was determined to be crucial in this reaction. The stability or extent of the protonated pyridine ring was also found to be another important key factor in obtaining high stereoselectivity. The nucleophilicity of the acceptor was found to be proportional to the stereoselectivity obtained, suggesting an SN 2-like mechanism.
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Affiliation(s)
- Michael P Mannino
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
| | - Alexei V Demchenko
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
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Karaki F, Umemoto S, Ashizawa K, Oki T, Sato N, Ogino T, Ishibashi N, Someya R, Miyano K, Hirayama S, Uezono Y, Fujii H. A New Lead Identification Strategy: Screening an sp
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‐rich and Lead‐like Compound Library Composed of 7‐Azanorbornane Derivatives. ChemMedChem 2019; 14:1840-1848. [DOI: 10.1002/cmdc.201900398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/18/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Fumika Karaki
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Medicinal Research Laboratories School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
| | - Sho Umemoto
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
| | - Karin Ashizawa
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Tomoya Oki
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
| | - Noriko Sato
- Analytical Unit for Organic Chemistry Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
| | - Takumi Ogino
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Naoto Ishibashi
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Ryoto Someya
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Kanako Miyano
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Shigeto Hirayama
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Medicinal Research Laboratories School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
| | - Yasuhito Uezono
- Division of Cancer Pathophysiology National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
- Division of Supportive Care Research Exploratory Oncology Research & Clinical Trial Center National Cancer Center 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
- Innovation Center for Supportive, Palliative and Psychosocial Care National Cancer Center Hospital 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
- Department of Comprehensive Oncology Graduate School of Biomedical Sciences Nagasaki University 1-12-4 Sakamoto Nagasaki 852-8523 Japan
| | - Hideaki Fujii
- Laboratory of Medicinal Chemistry School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
- Medicinal Research Laboratories School of Pharmacy Kitasato University 5-9-1, Shirokane, Minato-ku Tokyo 108-8641 Japan
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Karaki F, Kuwada M, Tajiri S, Kanda M, Yanai M, Kamimura M, Itoh K, Fujii H. A deprotection procedure using SO 3H silica gel to remove non-silyl protecting groups. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2018.1548023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Fumika Karaki
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
- Medicinal Research Laboratories, School of Pharmacy, Kitasato University , Tokyo, Japan
| | - Miki Kuwada
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
| | - Saki Tajiri
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
| | - Misaki Kanda
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
| | - Mari Yanai
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
| | | | - Kennosuke Itoh
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
- Medicinal Research Laboratories, School of Pharmacy, Kitasato University , Tokyo, Japan
| | - Hideaki Fujii
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University , Tokyo, Japan
- Medicinal Research Laboratories, School of Pharmacy, Kitasato University , Tokyo, Japan
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