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Yamaoka Y, Imahori H, Namioka M, Nishina R, Kobori Y, Ueda M, Shindo M, Takasu K. Entry into Lithium Ynolates from α,α,α-Tribromomethyl Ketones: Synthesis of Cyclobutenes via the [2 + 2] Cycloaddition with α,β-Unsaturated Carbonyls. Org Lett 2024; 26:1896-1901. [PMID: 38421178 DOI: 10.1021/acs.orglett.4c00202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
This study reports the synthesis of cyclobutene derivatives in good yields via the [2 + 2] cycloaddition between lithium ynolates and α,β-unsaturated carbonyls. The ynolates are generated from α,α,α-tribromomethyl ketones and tert-butyl lithium via a simple and novel method, which does not produce any harmful byproducts, such as lithium alkoxide, which induces a polymerization reaction with α,β-unsaturated carbonyls.
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Affiliation(s)
- Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
- School of Pharmacy, Hyogo Medical University, Minatojima, Chuo-ku, Kobe, 770-8505, Japan
| | - Hidetaka Imahori
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Motoki Namioka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ryo Nishina
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yukiko Kobori
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Motoki Ueda
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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Jouffroy L, Verhoeven J, Brambilla M, Verniest G, Kong H, Zhao Y, Wang W, Meerpoel L, Thuring JW, Winne JM. Regio- and Stereoselective Synthesis of C-4' Spirocyclobutyl Ribofuranose Scaffolds and Their Use as Biologically Active Nucleoside Analogues. Org Lett 2021; 23:8828-8833. [PMID: 34730365 DOI: 10.1021/acs.orglett.1c03334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Novel C-4',C-5' cyclobutane-fused spirocyclic ribonucleoside analogues were prepared. Thermal [2 + 2] cycloaddition between dichloroketene and readily derived 4'-exo-methylene furanoses afforded a first entry to the required constrained ribofuranoses, relying on a carbonyl transposition sequence. Alternatively, an unusual stereoselective ionic [2 + 2] cycloaddition using methyl propiolate promoted by methylaluminoxane gave a complementary, more direct approach to such ribofuranoses. Further conversion to the constrained adenosine analogues revealed promising structure-dependent inhibition of the protein methyltransferase PRMT5:MEP50 complex in the (sub)micromolar range.
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Affiliation(s)
- Lucile Jouffroy
- Department of Organic and Macromolecular Chemistry, Ghent University, Campus Sterre, Krijgslaan 281-S4, 9000 Gent, Belgium
| | - Jonas Verhoeven
- Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium.,Research Group of Organic Chemistry (ORGC), Department of Chemistry and Department of Bio-engineering Sciences, Faculty of Science and Bio-engineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Marta Brambilla
- Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium
| | - Guido Verniest
- Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium.,Research Group of Organic Chemistry (ORGC), Department of Chemistry and Department of Bio-engineering Sciences, Faculty of Science and Bio-engineering Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Hanchu Kong
- Department of Synthetic Chemistry, Pharmaron Beijing Co., Ltd., 6 Taihe Road BDA, Beijing 100176, People's Republic of China
| | - Yongbin Zhao
- Department of Synthetic Chemistry, Pharmaron Beijing Co., Ltd., 6 Taihe Road BDA, Beijing 100176, People's Republic of China
| | - Wenbin Wang
- Department of Synthetic Chemistry, Pharmaron Beijing Co., Ltd., 6 Taihe Road BDA, Beijing 100176, People's Republic of China
| | - Lieven Meerpoel
- Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium
| | | | - Johan M Winne
- Department of Organic and Macromolecular Chemistry, Ghent University, Campus Sterre, Krijgslaan 281-S4, 9000 Gent, Belgium
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Yamasaki K, Yamauchi A, Inokuma T, Miyakawa Y, Wang Y, Oriez R, Yamaoka Y, Takasu K, Tanaka N, Kashiwada Y, Yamada K. Mechanistic Support for Intramolecular Migrative Cyclization of Propargyl Sulfones Provided by Catalytic Asymmetric Induction with a Chiral Counter Cation Strategy. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kohta Yamasaki
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Akiho Yamauchi
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Research Cluster on “Innovative Chemical Sensing” Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Yasunori Miyakawa
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Yinli Wang
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Raphaël Oriez
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Naonobu Tanaka
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Yoshiki Kashiwada
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Ken‐ichi Yamada
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Research Cluster on “Innovative Chemical Sensing” Tokushima University Shomachi, Tokushima 770-8505 Japan
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Takasu K, Shigenaga K, Shimoda K, Takikawa H, Yamaoka Y. Synthesis of Lactone-Fused Cyclopropanes by Ring Contractive α-Ketol Rearrangement of Ketal-Fused Cyclobutanones. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Saiegh TJ, Chédotal H, Meyer C, Cossy J. Rhodium(III)-Catalyzed C(sp 2)-H Functionalization of Cyclobutenes. Access to Cyclobuta[ c]pyridones and -pyridines. Org Lett 2019; 21:8364-8368. [PMID: 31584826 DOI: 10.1021/acs.orglett.9b03139] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
O-(ω-Alkynyl) hydroxamates derived from cyclobutenyl carboxylic acids were identified as viable substrates in intramolecular rhodium(III)-catalyzed heteroannulations, which led to diversely substituted cyclobuta[c]pyridones. Further functionalization of the resulting cyclobutapyridones enabled the synthesis of cyclobuta[c]pyridines and other nitrogen heterocycles after electrocyclic ring opening of the four-membered ring.
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Affiliation(s)
- Tomas J Saiegh
- Molecular, Macromolecular Chemistry, and Materials (C3M) , ESPCI Paris, CNRS (UMR7167), PSL University , 10 rue Vauquelin , Paris 75231 Cedex 05 , France
| | - Henri Chédotal
- Molecular, Macromolecular Chemistry, and Materials (C3M) , ESPCI Paris, CNRS (UMR7167), PSL University , 10 rue Vauquelin , Paris 75231 Cedex 05 , France
| | - Christophe Meyer
- Molecular, Macromolecular Chemistry, and Materials (C3M) , ESPCI Paris, CNRS (UMR7167), PSL University , 10 rue Vauquelin , Paris 75231 Cedex 05 , France
| | - Janine Cossy
- Molecular, Macromolecular Chemistry, and Materials (C3M) , ESPCI Paris, CNRS (UMR7167), PSL University , 10 rue Vauquelin , Paris 75231 Cedex 05 , France
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Shimoda K, Yamaoka Y, Yoo D, Yamada KI, Takikawa H, Takasu K. Total Syntheses of Allelopathic 4-Oxyprotoilludanes, Melleolides, and Echinocidins. J Org Chem 2019; 84:11014-11024. [PMID: 31403293 DOI: 10.1021/acs.joc.9b01589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Stereocontrolled total syntheses of allelopathic 4-oxyprotoilludane sesquiterpenes, melleolide, melleolide F, and echinocidins B and D were achieved. The curved 5/6/4 tricyclic system with an angular hydroxy group was built via three key transformations: (1) Me3Al-catalyzed [2 + 2] cycloaddition of a ketene silyl acetal with a propiolate, (2) reductive ring-opening of a cyclic hemiketal, and (3) the intramolecular Morita-Baylis-Hillman reaction. This synthetic route represents a new and reliable strategy to obtain protoilludanes with several oxy-functional groups.
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Affiliation(s)
- Kazuma Shimoda
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Dongeun Yoo
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Hiroshi Takikawa
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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Atkin L, Chen Z, Robertson A, Sturgess D, White JM, Rizzacasa MA. Synthesis of Alkyl Citrates (-)-CJ-13,981, (-)-CJ-13,982, and (-)-L-731,120 via a Cyclobutene Diester. Org Lett 2018; 20:4255-4258. [PMID: 29953238 DOI: 10.1021/acs.orglett.8b01665] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient and step-economic new approach to alkyl citrate natural products from a cyclobutene diester is presented. The key sequence involves a formal [2 + 2]-cycloaddition of a silylketene acetal with dimethylacetylene dicarboxylate to provide the cyclobutene diester 14 with 4.5:1 stereoselectivity. Exposure of diester 14 in acidic methanol effected a hydrolysis, intramolecular oxy-Michael reaction, and cyclobutanone methanolysis cascade to give the triester 15. Iodination and elimination then afforded a key alkyl citrate alkene intermediate, which was converted into the natural products (-)-CJ-13,982 (1), (-)-CJ-13,981 (2), and (-)-L-731,120 (3) via a cross-metathesis and subsequent reduction.
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Affiliation(s)
- Liselle Atkin
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
| | - Zongjia Chen
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
| | - Angus Robertson
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
| | - Dayna Sturgess
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
| | - Jonathan M White
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
| | - Mark A Rizzacasa
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Melbourne , Victoria 3010 , Australia
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