1
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Yang K, Yin D, Sun Y, Yang Z, Li Y, Xu L, Du Y. Synthesis of Fluoromethylated Chromones and Their Heteroatom Analogues via Sodium Fluoromethanesulfinate-Enabled Direct Fluoromethylation. J Org Chem 2024; 89:565-575. [PMID: 38115769 DOI: 10.1021/acs.joc.3c02301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
An array of biologically interesting tri/difluoromethylated chromones and their heteroatom analogues were conveniently synthesized from the reaction of chromones and their heteroatom analogues with CF3SO2Na or HCF2SO2Na in the presence of tert-butyl hydroperoxide under mild conditions. A mechanistic pathway involving the generation of the electrophilic tri/difluoromethyl radical, followed with the radical substitution of chromones and their heteroatom analogues, was postulated.
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Affiliation(s)
- Kaiyue Yang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Dongxue Yin
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Yuli Sun
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Zhifang Yang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Yadong Li
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Lingzhi Xu
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Yunfei Du
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
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2
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Nandy A, Sekar G. Transition Metal-Free Iodine-Catalyzed Denitrative C-S Cross-Coupling: An Atypical Route to Access Thiochromane Derivatives. J Org Chem 2022; 87:7536-7546. [PMID: 35583473 DOI: 10.1021/acs.joc.2c00425] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An iodine-catalyzed denitrative C-S cross-coupling reaction has been developed to attain thiochromanones from 2'-nitrochalcones and xanthate. The strategy was extended for a three-component synthesis of thiochromenes via intermolecular C-S cross-coupling followed by aldol reaction. The reaction proceeds via activation of the keto group of chalcone through a halogen bond complex with iodine/denitrative C-S bond formation with xanthate/sulfa-Michael addition to chalcones. The methodology was also demonstrated for chemoselective reduction of chalcones. The protocol was also employed to synthesize biologically important 3'-hydroxythioflavone and thiochromenones.
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Affiliation(s)
- Anuradha Nandy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai600 036, Tamil Nadu, India
| | - Govindasamy Sekar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai600 036, Tamil Nadu, India
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3
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Iwumene NUN, Moseley DF, Pullin RDC, Willis MC. Diverse saturated heterocycles from a hydroacylation/conjugate addition cascade. Chem Sci 2022; 13:1504-1511. [PMID: 35222935 PMCID: PMC8809418 DOI: 10.1039/d1sc06900d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/10/2022] [Indexed: 11/21/2022] Open
Abstract
Rhodium-catalyzed hydroacylation using alkynes substituted with pendant nucleophiles, delivers linear α,β-unsaturated enone intermediates with excellent regioselectivity. These adducts are used to construct a broad range of diversely substituted, saturated O-, N- and S-heterocycles in a one-pot process. Judicious choice of cyclisation conditions enabled isolation of O-heterocycles with high levels of diastereoselectivity. A variety of derivatisation reactions are also performed, generating functionalised hydroacylation products. This sequence serves as a general approach for the synthesis of fully saturated heterocycles.
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Affiliation(s)
- Ndidi U N Iwumene
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Daniel F Moseley
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Robert D C Pullin
- Vertex Pharmaceuticals (Europe) Ltd 86-88 Jubilee Avenue, Milton Park Abingdon OX14 4RW UK
| | - Michael C Willis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
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4
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In Lee J. A review of the syntheses of flavanones, thioflavanones, and azaflavanones from 2'‐substituted chalcones. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jae In Lee
- Department of Chemistry College of Science and Technology, Duksung Women's University Seoul Republic of Korea
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5
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In Lee J. Synthetic Approaches to
2‐Alkylthiochroman
‐4‐ones and Thioflavanones. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jae In Lee
- Department of Chemistry, College of Science and Technology Duksung Women's University Seoul 01369 Republic of Korea
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6
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Seo S, Gao M, Paffenholz E, Willis MC. Sequential Catalytic Functionalization of Aryltriazenyl Aldehydes for the Synthesis of Complex Benzenes. ACS Catal 2021; 11:6091-6098. [PMID: 34306807 PMCID: PMC8291607 DOI: 10.1021/acscatal.1c01722] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 04/29/2021] [Indexed: 11/29/2022]
Abstract
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We demonstrate that
aryltriazenes can promote three distinctive
types of C–H functionalization reactions, allowing the preparation
of complex benzene molecules with diverse substitution patterns. 2-Triazenylbenzaldehydes
are shown to be efficient substrates for Rh(I)-catalyzed intermolecular
alkyne hydroacylation reactions. The resulting triazene-substituted
ketone products can then undergo either a Rh(III)-catalyzed C–H
activation, or an electrophilic aromatic substitution reaction, achieving
multifunctionalization of the benzene core. Subsequent triazene derivatization
provides traceless products.
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Affiliation(s)
- Sangwon Seo
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Ming Gao
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Eva Paffenholz
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Michael C. Willis
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
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7
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Shirai T, Iwasaki T, Kanemoto K, Yamamoto Y. Cationic Iridium/Chiral Bisphosphine‐Catalyzed Enantioselective Hydroacylation of Ketones. Chem Asian J 2020; 15:1858-1862. [DOI: 10.1002/asia.202000386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 04/09/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Tomohiko Shirai
- Department of Social Design Engineering National Institute of Technology Kochi College 200-1 Monobe Otsu Nankoku Kochi 783-8508 Japan
| | - Tomoya Iwasaki
- Department of Materials Science and Engineering National Institute of Technology Kochi College 200-1 Monobe otsu Nankoku Kochi 783-8508 Japan
| | - Kazuya Kanemoto
- Department of Applied Chemistry Institute of Science and Engineering Chuo University Kasuga 1–3-27 Bunkyo-ku Tokyo 112-8551 Japan
| | - Yasunori Yamamoto
- Division of Applied Chemistry and Frontier Chemistry Center (FCC) Faculty of Engineering Hokkaido University Kita 13 Nishi 8, Kita-ku Sapporo Hokkaido 060-8628 Japan
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8
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Bellinger TJ, Harvin T, Pickens-Flynn T, Austin N, Whitaker SH, Tang Yuk Tutein MLC, Hukins DT, Deese N, Guo F. Conjugate Addition of Grignard Reagents to Thiochromones Catalyzed by Copper Salts: A Unified Approach to Both 2-Alkylthiochroman-4-One and Thioflavanone. Molecules 2020; 25:E2128. [PMID: 32370080 PMCID: PMC7248974 DOI: 10.3390/molecules25092128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/28/2020] [Accepted: 04/29/2020] [Indexed: 11/16/2022] Open
Abstract
Grignard reagents undergo conjugate addition to thiochromones catalyzed by copper salts to afford 2-substituted-thiochroman-4-ones, both 2-alkylthiochroman-4-ones and thioflavanones (2-arylthiochroman-4-ones), in good yields with trimethylsilyl chloride (TMSCl) as an additive. The best yields of 1,4-adducts can be attained with CuCN∙2LiCl as the copper source. Excellent yields of 2-alkyl-substituted thiochroman-4-ones and thioflavanones (2-aryl substituted) are attained with a broad range of Grignard reagents. This approach works well with both alkyl and aromatic Grignard reagents, thus providing a unified synthetic approach to privileged 2-substituted thiochroman-4-ones and a potential valuable precursor for further synthetic applications towards many pharmaceutically active molecules. The use of commercially available and/or readily prepared Grignard reagents will expedite the synthesis of a large library of both 2-alkyl substituted thiochroman-4-ones and thioflavanones for additional synthetic applications.
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Affiliation(s)
- Tania J. Bellinger
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Teavian Harvin
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Ti’Bran Pickens-Flynn
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Nataleigh Austin
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Samuel H. Whitaker
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Mai Ling C. Tang Yuk Tutein
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Dabria T. Hukins
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Nichele Deese
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
| | - Fenghai Guo
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA; (T.J.B.); (T.H.); (T.P.-F.); (N.A.); (S.H.W.); (M.L.C.T.Y.T.); (D.T.H.); (N.D.)
- Biomedical Research Infrastructure Center, Winston Salem State University, Winston Salem, NC 27110, USA
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9
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In Lee J. New Synthesis of Thioflavanones by the Regioselective Cyclization of 1‐(2‐Benzylthio)phenyl‐3‐phenyl‐2‐propen‐1‐ones with Hydrobromic Acid. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.11989] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jae In Lee
- Department of ChemistryCollege of Natural Science, Duksung Women's University Seoul 01369 Republic of Korea
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10
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Meng L, Ngai KY, Chang X, Lin Z, Wang J. Cu(I)-Catalyzed Enantioselective Alkynylation of Thiochromones. Org Lett 2020; 22:1155-1159. [PMID: 31961693 DOI: 10.1021/acs.orglett.0c00005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A highly efficient asymmetric synthesis of chiral thiochromanones is developed via Cu(I)/phosphoramidite catalyzed asymmetric alkynylation of thiochromones under mild reaction conditions. The catalyst system is tolerant of various thiochromone precursors and terminal alkynes. The established asymmetric transformation provides different enatiomeric-enriched thiochromanones with more molecular complexity and enables access to chiral thioflavanones, a subgroup of flavonoid by further functionalization.
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Affiliation(s)
- Ling Meng
- Shenzhen Grubbs Institute and Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China.,Department of Chemistry , The Hong Kong University of Science & Technology , Clear Water Bay, Kowloon , Hong Kong
| | - Ka Yan Ngai
- Shenzhen Grubbs Institute and Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Xiaoyong Chang
- Shenzhen Grubbs Institute and Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Zhenyang Lin
- Department of Chemistry , The Hong Kong University of Science & Technology , Clear Water Bay, Kowloon , Hong Kong
| | - Jun Wang
- Shenzhen Grubbs Institute and Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
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11
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Matsumoto Y, Tsuji T, Nakatake D, Yazaki R, Ohshima T. Thionoesters as 1,2‐Dipolarophiles for [4+2] Cycloaddition with Cyclobutanones. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yohei Matsumoto
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi Higashi-ku, Fukuoka 812-8582 Japan
| | - Taro Tsuji
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi Higashi-ku, Fukuoka 812-8582 Japan
| | - Daiki Nakatake
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi Higashi-ku, Fukuoka 812-8582 Japan
| | - Ryo Yazaki
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi Higashi-ku, Fukuoka 812-8582 Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical SciencesKyushu University Maidashi Higashi-ku, Fukuoka 812-8582 Japan
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12
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Lee SC, Guo L, Rueping M. Nickel-catalyzed exo-selective hydroacylation/Suzuki cross-coupling reaction. Chem Commun (Camb) 2019; 55:14984-14987. [DOI: 10.1039/c9cc07558e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first nickel-catalyzed intramolecular hydroacylation/Suzuki cross coupling cascade of o-allylbenzaldehydes with a broad range of phenylboronic acid neopentyl glycol esters has been developed.
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Affiliation(s)
- Shao-Chi Lee
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
| | - Lin Guo
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
| | - Magnus Rueping
- Institute of Organic Chemistry
- RWTH Aachen University
- Aachen
- Germany
- KAUST Catalysis Center (KCC)
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13
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Synthesis of tetrahydro-4H-thiopyran-4-ones (microreview). Chem Heterocycl Compd (N Y) 2019. [DOI: 10.1007/s10593-019-02413-9] [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]
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14
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Rao MLN, Ramakrishna BS, Nand S. Rh-Catalyzed domino synthesis of 4-hydroxy-3-methylcoumarins via branch-selective hydroacylation. Org Biomol Chem 2019; 17:9275-9279. [DOI: 10.1039/c9ob01972c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Rh-catalyzed domino synthesis of 4-hydroxy-3-methylcoumarins via branch-selective hydroacylation of acrylates and acrylamides using salicylaldehydes is described.
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Affiliation(s)
- Maddali L. N. Rao
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur
- India
| | | | - Sachchida Nand
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur
- India
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15
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See JY, Zhao Y. Ag-Catalyzed Thiocyanofunctionalization of Terminal Alkynes To Access Alkynylthiocyanates and α-Thiocyanoketones. Org Lett 2018; 20:7433-7436. [DOI: 10.1021/acs.orglett.8b03162] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jie Yang See
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Yu Zhao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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16
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Cascade reactions as efficient and universal tools for construction and modification of 6-, 5-, 4- and 3-membered sulfur heterocycles of biological relevance. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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17
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Ma YG, Huang MQ, Liu Z, Liu JQ, Wang XS. Synthesis of Substituted 4 H-Thiochromen-4-imines via Copper-Catalyzed Cyclization Cascades of o-Bromobenzothioamides with Terminal Alkynes. J Org Chem 2018; 83:9504-9509. [PMID: 29975537 DOI: 10.1021/acs.joc.8b01180] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A series of ( E)- N-aryl-4 H-thiochromen-4-imines has been conveniently obtained through a cascade reaction between o-bromobenzothioamides and terminal alkynes. This novel approach probably involved an initial generation of benzothietane-2-imine intermidates via an intramolecular Ullmann reaction under CuI/L-proline cocatalysis and alkaline conditions followed by imine alkynylation, ring opening, and cyclization sequences to provide the unexpected 4 H-thiochromen-4-imines rather than isothiochromans.
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Affiliation(s)
- Yong-Gang Ma
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials , Jiangsu Normal University , Xuzhou Jiangsu 221116 , P. R. China
| | - Meng-Qiao Huang
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials , Jiangsu Normal University , Xuzhou Jiangsu 221116 , P. R. China
| | - Zhenhua Liu
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , P. R. China
| | - Jian-Quan Liu
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials , Jiangsu Normal University , Xuzhou Jiangsu 221116 , P. R. China
| | - Xiang-Shan Wang
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials , Jiangsu Normal University , Xuzhou Jiangsu 221116 , P. R. China
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18
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Bass SA, Parker DM, Bellinger TJ, Eaton AS, Dibble AS, Koroma KL, Sekyi SA, Pollard DA, Guo F. Development of Conjugate Addition of Lithium Dialkylcuprates to Thiochromones: Synthesis of 2-Alkylthiochroman-4-ones and Additional Synthetic Applications. Molecules 2018; 23:E1728. [PMID: 30011953 PMCID: PMC6099951 DOI: 10.3390/molecules23071728] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 07/05/2018] [Accepted: 07/13/2018] [Indexed: 12/05/2022] Open
Abstract
Lithium dialkylcuprates undergo conjugate addition to thiochromones to afford 2-alkylthiochroman-4-ones in good yields. This approach provide an efficient and general synthetic approach to privileged sulfur-containing structural motifs and valuable precursors for many pharmaceuticals, starting from common substrates-thiochromones. Good yields of 2-alkyl-substituted thiochroman-4-ones are attained with lithium dialkylcuprates, lithium alkylcyanocuprates or substoichiometric amount of copper salts. The use of commercially available inexpensive alkyllithium reagents will expedite the synthesis of a large library of 2-alkyl substituted thiochroman-4-ones for additional synthetic applications.
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Affiliation(s)
- Shekinah A Bass
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Dynasty M Parker
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Tania J Bellinger
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Aireal S Eaton
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Angelica S Dibble
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Kaata L Koroma
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Sylvia A Sekyi
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - David A Pollard
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
| | - Fenghai Guo
- Department of Chemistry, Winston Salem State University, 601 S. Martin Luther King Jr. Dr., Winston Salem, NC 27110, USA.
- Biomedical Research Infrastructure Center, Winston Salem State University, Winston Salem, NC 27110, USA.
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19
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Straker RN, Majhail MK, Willis MC. Exploiting rhodium-catalysed ynamide hydroacylation as a platform for divergent heterocycle synthesis. Chem Sci 2017; 8:7963-7968. [PMID: 29568442 PMCID: PMC5853270 DOI: 10.1039/c7sc03795c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 09/27/2017] [Indexed: 01/11/2023] Open
Abstract
The first examples of ynamide hydroacylation are described. The choice of ligand system determines reaction regioselectivity, resulting in α- and β-enaminones. The latter are transformed into a variety of N-heterocycles.
The first examples of ynamide hydroacylation are described. Using rhodium catalysis, linear β-enaminone products are generated in high yield and excellent regioselectivity from the combination of aldehydes and ynamides. The enaminone products are subsequently used as a platform to construct a diverse array of substituted pyrazoles, pyrimidines, and isoxazoles in a two-step, one-pot sequence. It was found that with judicious choice of catalyst system it was possible to overturn the regioselectivity of the hydroacylation reaction to generate α-enaminone products.
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Affiliation(s)
- Robert N Straker
- Department of Chemistry , University of Oxford , Chemistry Research Laboratory , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Manjeet K Majhail
- Department of Chemistry , University of Oxford , Chemistry Research Laboratory , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Michael C Willis
- Department of Chemistry , University of Oxford , Chemistry Research Laboratory , Mansfield Road , Oxford , OX1 3TA , UK .
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20
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A rapid entry into thioflavanones via conjugate additions of diarylcuprates to thiochromones. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.08.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Gao M, Willis MC. Enantioselective Three-Component Assembly of β'-Aryl Enones Using a Rhodium-Catalyzed Alkyne Hydroacylation/Aryl Boronic Acid Conjugate Addition Sequence. Org Lett 2017; 19:2734-2737. [PMID: 28485946 DOI: 10.1021/acs.orglett.7b01087] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Rhodium-catalyzed alkyne hydroacylation using alkyl β-S-aldehydes, enantioselective rhodium-catalyzed aryl boronic acid conjugate addition, and sulfide elimination are combined in sequence to provide β'-aryl enones. The reaction sequence is efficient and delivers highly functionalized products with excellent levels of enantiocontrol. Good variation of the three reaction components is demonstrated. The sequence corresponds to the formal regio- and enantioselective monoconjugate addition of aryl boronic acids to dienones.
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Affiliation(s)
- Ming Gao
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Mansfield Road, Oxford OX1 3TA, U.K
| | - Michael C Willis
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Mansfield Road, Oxford OX1 3TA, U.K
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