1
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Tanaka K, Asada Y, Hoshino Y. A new cycloaddition profile for ortho-quinone methides: photoredox-catalyzed [6+4] cycloadditions for synthesis of benzo[ b]cyclopenta[ e]oxepines. Chem Commun (Camb) 2022; 58:2476-2479. [PMID: 35014637 DOI: 10.1039/d1cc06332d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Visible-light-induced [6+4] cycloaddition reactions of ortho-quinone methides have been developed. The reaction of ortho-quinone methides with pentafulvenes in the presence of a thioxanthylium photoredox catalyst afforded benzo[b]cyclopenta[e]oxepines. The present reaction represents a promising tool for the synthesis of natural products and bioactive compounds that contain a benzoxepine structure.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
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2
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Shankar B, Khatri V, Kumar B, Maikhuri VK, Kumar A, Tomar R, Prasad AK. Synthesis and Structural Characterization of 1-( E-1-Arylpropenon-3-yl)-3,4,6-tri- O-benzyl-d-glucals and Their Transformation into Pentasubstituted (2 R,3 S,4 R)-Chromanes via Pd-Catalyzed Cross Dehydrogenative Coupling Reaction. ACS OMEGA 2021; 6:11248-11259. [PMID: 34056280 PMCID: PMC8153922 DOI: 10.1021/acsomega.1c00103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
We have developed an efficient methodology for the synthesis of (2R,3S,4R)-2-hydroxymethyl-3,4-dihydroxy-6-aryl-7-aroylchromanes in which the chirality at the C-2, C-3, and C-4 positions is being drawn from C-glucopyranosyl aldehyde, which in turn can be efficiently synthesized from d-glucose. Thus, the synthesis starts with the transformation of sugar aldehyde into 1-(E-1-arylpropenon-3-yl)-3,4,6-tri-O-benzyl-d-glucals using Claisen-Schmidt type condensation reaction with different acetophenones and then to 1,2-disubstituted glucals via Pd(II)-catalyzed cross dehydrogenative coupling reaction, which in turn has been efficiently converted into (2R,3S,4R)-chromanes via 6π-electrocyclization and in situ dehydrogenative aromatization.
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Affiliation(s)
- Bhawani Shankar
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
- Department
of Chemistry, Deshbandhu College, University
of Delhi, Delhi 110019, India
| | - Vinod Khatri
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
| | - Banty Kumar
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
| | - Vipin K. Maikhuri
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
| | - Amit Kumar
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
| | - Rashmi Tomar
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
| | - Ashok K. Prasad
- Bioorganic
Laboratory, Department of Chemistry, University
of Delhi, Delhi 110007, India
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3
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Tanaka K, Iwama Y, Kishimoto M, Ohtsuka N, Hoshino Y, Honda K. Redox Potential Controlled Selective Oxidation of Styrenes for Regio- and Stereoselective Crossed Intermolecular [2 + 2] Cycloaddition via Organophotoredox Catalysis. Org Lett 2020; 22:5207-5211. [PMID: 32525321 DOI: 10.1021/acs.orglett.0c01852] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A redox potential controlled intermolecular [2 + 2] cross-cycloaddition has been developed in the presence of a thioxanthylium photoredox catalyst. Electron-rich styrenes such as β-bromostyrene (Ep/2 = +1.61 V vs SCE) were selectively oxidized by a thioxanthylium photoredox catalyst (E1/2 (C*/C•-) = +1.76 V vs SCE) to styryl radical cations and reacted with styrene (Ep/2 = +1.97 V vs SCE) to furnish polysubstituted cyclobutanes in high yields. The present reaction can be successfully applied to intermolecular [2 + 2] cross-cycloaddition of β-halogenostyrenes, which cannot be effectively achieved by the hitherto reported representative organophotoredox catalysts.
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Affiliation(s)
- Kenta Tanaka
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yoshinori Iwama
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Naoya Ohtsuka
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI, Okazaki, Aichi 444-8787, Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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4
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Tanaka K, Asada Y, Hoshino Y, Honda K. Visible-light-induced [4 + 2] cycloaddition of pentafulvenes by organic photoredox catalysis. Org Biomol Chem 2020; 18:8074-8078. [PMID: 32789391 DOI: 10.1039/d0ob01151g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We have developed thioxanthylium photoredox catalyzed [4 + 2] cycloaddition of pentafulvenes at room temperature under green light irradiation, which affords tetrahydrocyclopenta[b]chromenes with high regioselectivities. The present reaction provides a sustainable approach to carry out the cycloaddition of pentafulvenes without the use of transition metal catalysts or high-temperature conditions. This procedure enables a mild and straightforward access to 1,3a,9,9a-tetrahydrocyclopenta[b]chromenes. The quantum yield of the reaction (Φ = 0.15) indicates that the reaction would mainly proceed via photocatalytic pathways.
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Affiliation(s)
- Kenta Tanaka
- Faculty of Pharmaceutical Science, Tokyo University of Science, 2641 Yamazaki, Noda-city, Chiba 278-8510, Japan.
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
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5
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Tanaka K, Kishimoto M, Asada Y, Tanaka Y, Hoshino Y, Honda K. Access to Electron-Deficient 2,2-Disubstituted Chromanes: A Highly Regioselective One-Pot Synthesis via an Inverse-Electron-Demand [4 + 2] Cycloaddition of ortho-Quinone Methides. J Org Chem 2019; 84:13858-13870. [PMID: 31580068 DOI: 10.1021/acs.joc.9b02036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report the one-pot synthesis of 2,2-disubstituted chromanes with electron-withdrawing substituents. This reaction provides a simple yet efficient route to a wide range of electron-deficient chromanes in high yield and excellent regioselectivity. The reaction of salicylaldehyde with 1,1-disubstituted ethylenes smoothly furnishes these electron-deficient chromanes, which can be further transformed into functionalized chromanes or chromene. For example, BW683C was effectively synthesized from 5-chlorosalicylaldehyde with 4-chlorostyrene in two steps in excellent yield. The present reaction thus provides versatile access to functionalized electron-deficient chromanes and chromenes and therefore constitutes a promising tool for the synthesis of biologically and photochemically active molecules.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yuta Tanaka
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
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6
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Tanaka K, Tanaka Y, Kishimoto M, Hoshino Y, Honda K. Friedel-Crafts approach to the one-pot synthesis of methoxy-substituted thioxanthylium salts. Beilstein J Org Chem 2019; 15:2105-2112. [PMID: 31579074 PMCID: PMC6753671 DOI: 10.3762/bjoc.15.208] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/20/2019] [Indexed: 02/05/2023] Open
Abstract
An efficient synthesis of methoxy-substituted thioxanthylium salts has been developed. The reaction of diaryl sulfides with benzoyl chlorides in the presence of TfOH smoothly proceeded to give the desired thioxanthylium salts in good yields. In their UV–vis spectra, the maximum absorption wavelengths of methoxy-functionalized thioxanthylium salts were observed at around 460 nm, which show a drastic red shift compared to the parent thioxanthylium salts. The present reaction provides a versatile access to functionalized thioxanthylium salts, and therefore it constitutes a promising tool for the synthesis of biologically and photochemically active molecules.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yuta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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7
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Filimonov SI, Chirkova ZV, Kabanova MV, Makarova ES, Shetnev AA, Panova VA, Suponitsky KY. A Condensation of Biginelli Products with 1,3‐Benzenediols: a Facile Access to Diastereomerically Pure Hexahydro‐5
H
‐chromeno[4,3‐
d
]pyrimidin‐5‐ones. ChemistrySelect 2019. [DOI: 10.1002/slct.201901997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Sergey I. Filimonov
- Yaroslavl State Technical University 88 Moscowskii str. Yaroslavl Russian Federation 150023
| | - Zhanna V. Chirkova
- Yaroslavl State Technical University 88 Moscowskii str. Yaroslavl Russian Federation 150023
| | - Mariya V. Kabanova
- Yaroslavl State Technical University 88 Moscowskii str. Yaroslavl Russian Federation 150023
| | - Elena S. Makarova
- Yaroslavl State Technical University 88 Moscowskii str. Yaroslavl Russian Federation 150023
| | - Anton A. Shetnev
- Ushinsky Yaroslavl State Pedagogical University 108 Respublikanskaya St., Yaroslavl Russian Federation 150000
| | - Valeria A. Panova
- Ushinsky Yaroslavl State Pedagogical University 108 Respublikanskaya St., Yaroslavl Russian Federation 150000
| | - Kyrill Yu. Suponitsky
- INEOS RAS 28 Vavilova St., Moscow, Russian Federation 119991
- Plekhanov Russian University of Economics 36 Stremyanny lane, Moscow Russian Federation 117997
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8
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Tanaka K, Omata D, Asada Y, Hoshino Y, Honda K. Organophotoredox-Catalyzed Intermolecular Oxa-[4+2] Cycloaddition Reactions. J Org Chem 2019; 84:10669-10678. [PMID: 31322873 DOI: 10.1021/acs.joc.9b01156] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
An intermolecular oxa-[4+2] cycloaddition reaction promoted by a thioxanthylium photoredox catalyst under irradiation with green light has been developed. The reaction of ortho-quinone methides with styrenes smoothly affords the desired cycloadducts. Especially styrenes bearing electron-donating groups are efficiently transformed in this reaction. This method represents a sustainable way to carry out oxa-[4+2] cycloaddition reactions using only a catalytic amount of a photocatalyst and visible light.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Daichi Omata
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai , Hodogaya-ku, Yokohama 240-8501 , Japan
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9
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Honda K, Tanaka K, Sukekawa M, Hoshino Y, Kishimoto M. CsF-Promoted Desilylation and Ring-Contraction Reaction of Electron-Deficient 3-Silyl-2H-chromenes to 2-Benzylbenzofurans. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Tanaka K, Hoshino Y, Honda K. Development of Regioselective Inverse-Electron-Demand [4+2] Cycloaddition with Electron-Rich Arylalkynes for Access to Multi-Substituted Condensed Oxapolycyclic Compounds. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.1341] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University
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11
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Zhu H, Chen C, Li D, Wang P, Wang Y, Bai L, Yang D, Wang L. Direct Synthesis of a Dioxabenzobicyclo[3.2.1]octane Core from Salicylaldehydes. J Org Chem 2018; 83:12897-12902. [PMID: 30234985 DOI: 10.1021/acs.joc.8b01873] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A copper(II) trifluoromethanesulfonate via Prins reaction between salicylaldehydes and allyl alcohols is realized under mild conditions. A series of compounds containing dioxabenzobicyclo[3.2.1]octane motifs are obtained in moderate to good yields. The current method can efficiently construct the valuable structural motif from easily accessed starting materials, providing a smooth method to build benzobicyclo skeletons.
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Affiliation(s)
- Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Chao Chen
- Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology & Biotechnology , Peking University Shenzhen Graduate School , Shenzhen 518055 , China
| | - Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Pengxin Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Yuan Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Lutao Bai
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
| | - Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University , Lanzhou 730000 , China
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