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Kumagai Y, Kobayashi A, Nakamura K, Yoshida S. Facile synthesis of dibenzothiophene S-oxides from sulfinate esters. Chem Commun (Camb) 2024; 60:1611-1614. [PMID: 38230531 DOI: 10.1039/d3cc05703h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
An efficient method to prepare dibenzothiophene S-oxides is disclosed. Suzuki-Miyaura cross-coupling of 2-bromoaryl sulfinate esters with arylboronic acids selectively at the bromo group followed by electrophilic cyclization of the resulting sulfinate ester moiety provides diverse dibenzothiophene S-oxides. Further transformations including Pummerer-type C-H propargylation and aryne reactions realize to synthesize highly functionalized dibenzothiophene derivatives.
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Affiliation(s)
- Yukiko Kumagai
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
| | - Akihiro Kobayashi
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Keisuke Nakamura
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
| | - Suguru Yoshida
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
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2
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Zard SZ. The Xanthate Route to Indolines, Indoles, and their Aza Congeners. Chemistry 2020; 26:12689-12705. [DOI: 10.1002/chem.202001341] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 04/17/2020] [Indexed: 12/25/2022]
Affiliation(s)
- Samir Z. Zard
- Laboratoire de Synthèse Organique, UMR 7652 Ecole Polytechnique 91128 Palaiseau France
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3
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Abstract
The alkylation of enolates is one of the backbones of ketone chemistry, yet in practice it suffers from numerous limitations due to problems of regiochemistry (including O- versus C-alkylation), multiple alkylations, self-condensation, competing elimination, and incompatibility with many polar groups that have to be protected. Over the years, various solutions have been devised to overcome these difficulties, such as the employment of auxiliary ester or sulfone groups to modify the p Ka of the enolizable hydrogens, the passage by the corresponding hydrazones, the use of transition-metal-catalyzed redox systems to formally alkylate ketones with alcohols, etc. Most of these hurdles disappear upon switching to α-ketonyl radicals. Radicals are tolerant of most polar functions, and radical additions to flat sp2 centers are generally easier to accomplish than enolate substitution at tetrahedral sp3 carbons. The main stumbling block, however, has been a lack of generally applicable methods for the generation and intermolecular capture of α-ketonyl radicals. We have found over the past years that the degenerative exchange of xanthates represents in many ways an ideal solution to this problem. It overcomes essentially all of the difficulties faced by other radical processes because of its unique ability to reversibly store reactive radicals in a dormant, nonreactive form. The lifetime of the radicals can therefore be significantly enhanced, even in the concentrated medium needed for bimolecular additions, while at the same time regulating their absolute and relative concentrations. The ability to perform intermolecular additions to highly functionalized alkene partners opens up numerous possibilities for rapid and convergent access to complex structures. Of particular importance is the elaboration of ketones that are prone to self-condensation, such trifluoroacetone, and of base-sensitive ketones, such as chloro- and dichloroacetone, since the products can be used for the synthesis of a myriad fluorinated and heteroaromatic compounds of relevance to medicinal chemistry and agrochemistry. The formal distal dialkylation of ketones, also of utmost synthetic interest, is readily accomplished, allowing convenient access to a wide array of useful ketone building blocks. Cascade processes can be implemented and, in alliance with powerful classical reactions (aldol, alkylative Birch reductions, etc.), furnish a quick route to complex polycyclic scaffolds. Furthermore, the presence of the xanthate group in the adducts can be exploited to obtain a variety of arenes and heteroarenes, such as pyrroles, thiophenes, naphthalenes, and pyridines, as well as enones, dienes, and cyclopropanes. Last but not least, the reagents and most of the starting materials are exceedingly cheap, and the reactions are safe and easy to scale up.
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Affiliation(s)
- Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
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4
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Hayashi H, Kaga A, Wang B, Gagosz F, Chiba S. Use of a benzyl ether as a traceless hydrogen donor in the anti-Markovnikov hydrofunctionalization of alkenes with xanthates. Chem Commun (Camb) 2018; 54:7535-7538. [PMID: 29926014 DOI: 10.1039/c8cc02971g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A new protocol for the anti-Markovnikov hydrofunctionalization of alkenyl alcohol O-Bn ethers was developed using xanthates as functionalizing agents in the presence of lauroyl peroxide as a radical initiator and a stoichiometric oxidant. The benzyl group serves as a traceless hydrogen donor in the remote radical hydrogen atom transfer event during the process.
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Affiliation(s)
- Hirohito Hayashi
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
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5
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Min D, Yuan X, Liu T, Liu J, Tang S. Fe-catalyzed dithiane radical induced C−S bond activation−addition to α, β-unsaturated ketones. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800241] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Deng Min
- School of Pharmacy; Lanzhou University; Lanzhou 730000 People's Republic of China
| | - Xinyu Yuan
- School of Pharmacy; Lanzhou University; Lanzhou 730000 People's Republic of China
| | - Teng Liu
- School of Pharmacy; Lanzhou University; Lanzhou 730000 People's Republic of China
| | - Jian Liu
- School of Pharmacy; Lanzhou University; Lanzhou 730000 People's Republic of China
| | - Shouchu Tang
- School of Pharmacy; Lanzhou University; Lanzhou 730000 People's Republic of China
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 People's Republic of China
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6
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Huang Q, Zard SZ. Inexpensive Radical Methylation and Related Alkylations of Heteroarenes. Org Lett 2018; 20:1413-1416. [DOI: 10.1021/acs.orglett.8b00190] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Qi Huang
- Laboratoire de Synthèse
Organique, CNRS UMR 7652 Ecole Polytechnique, Palaiseau, 91128 Cedex, France
| | - Samir Z. Zard
- Laboratoire de Synthèse
Organique, CNRS UMR 7652 Ecole Polytechnique, Palaiseau, 91128 Cedex, France
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7
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Gualandi A, Matteucci E, Monti F, Baschieri A, Armaroli N, Sambri L, Cozzi PG. Photoredox radical conjugate addition of dithiane-2-carboxylate promoted by an iridium(iii) phenyl-tetrazole complex: a formal radical methylation of Michael acceptors. Chem Sci 2017; 8:1613-1620. [PMID: 28451291 PMCID: PMC5364518 DOI: 10.1039/c6sc03374a] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 11/02/2016] [Indexed: 12/20/2022] Open
Abstract
A readily accessible iridium(iii) phenyl-tetrazole complex ([Ir(ptrz)2(tBu-bpy)]+, 2; Hptrz = 2-methyl-5-phenyl-tetrazole; tBu-bpy = 4,4'-di-tert-butyl-2,2'-bipyridine) is shown to be a versatile catalyst for a new photocatalytic Michael reaction. Under light irradiation in the presence of 2, a dithiane 2-carboxylic acid, obtained by simple hydrolysis of a commercially available ethyl ester, generates a 1,3-dithiane radical capable of performing addition to a variety of Michael acceptors (e.g., unsaturated ketones, esters, amides and malonates). This broad scope reaction with high yields is a formal photo-redox addition of the elusive methyl radical and the adducts obtained can be starting materials for a variety of functionalized products. The excited-state oxidation potential of catalyst 2 allows selective formation of radicals only from α-heterosubstituted carboxylates. Chemical modification of this metal complex can tune the electrochemical properties, opening a route to new highly selective catalytic photo-oxidation reactions.
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Affiliation(s)
- Andrea Gualandi
- Dipartimento di Chimica "G. Ciamician" , ALMA MATER STUDIORUM Università di Bologna , Via Selmi 2 , 40126 Bologna , Italy .
| | - Elia Matteucci
- Dipartimento di Chimica Industriale "Toso Montanari" , ALMA MATER STUDIORUM Università di Bologna , Viale Risorgimento 4 , 40136 , Bologna , Italy .
| | - Filippo Monti
- Istituto per la Sintesi Organica e la Fotoreattività , Consiglio Nazionale delle Ricerche , Via P. Gobetti 101 , 40129 Bologna , Italy .
| | - Andrea Baschieri
- Dipartimento di Chimica Industriale "Toso Montanari" , ALMA MATER STUDIORUM Università di Bologna , Viale Risorgimento 4 , 40136 , Bologna , Italy .
| | - Nicola Armaroli
- Istituto per la Sintesi Organica e la Fotoreattività , Consiglio Nazionale delle Ricerche , Via P. Gobetti 101 , 40129 Bologna , Italy .
| | - Letizia Sambri
- Dipartimento di Chimica Industriale "Toso Montanari" , ALMA MATER STUDIORUM Università di Bologna , Viale Risorgimento 4 , 40136 , Bologna , Italy .
| | - Pier Giorgio Cozzi
- Dipartimento di Chimica "G. Ciamician" , ALMA MATER STUDIORUM Università di Bologna , Via Selmi 2 , 40126 Bologna , Italy .
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8
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Lai J, Tian L, Huo X, Zhang Y, Xie X, Tang S. Metal-Free Difunctionalization of Alkynes with 2-Chlorodithiane for Synthesis of β-Ketodithianes. J Org Chem 2015; 80:5894-9. [DOI: 10.1021/acs.joc.5b00187] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Junshan Lai
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Lixia Tian
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xing Huo
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Yuan Zhang
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xingang Xie
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Shouchu Tang
- School of Pharmacy and ‡State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
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9
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Li Y, Miyazawa K, Koike T, Akita M. Alkyl- and aryl-thioalkylation of olefins with organotrifluoroborates by photoredox catalysis. Org Chem Front 2015. [DOI: 10.1039/c4qo00352g] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A new photocatalytic alkyl- and aryl-thioalkylation of electron-deficient olefins using organotrifluoroborates has been developed.
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Affiliation(s)
- Yanjie Li
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Kazuki Miyazawa
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Takashi Koike
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Munetaka Akita
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
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10
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Lee M, Chen YH, Hung TH, Chang W, Yan WC, Leow D. Photocatalytic direct intermolecular addition of 1,3-dithianes. RSC Adv 2015. [DOI: 10.1039/c5ra19069j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A direct intermolecular radical addition of 1,3-dithianes to alkenes has been accomplished via visible-light mediated photocatalysis.
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Affiliation(s)
- Ming Lee
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Ying-Ho Chen
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Tzu-Hang Hung
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Wen Chang
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Wei-Cheng Yan
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Dasheng Leow
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
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11
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Lai J, Du W, Tian L, Zhao C, She X, Tang S. Fe-Catalyzed Direct Dithioacetalization of Aldehydes with 2-Chloro-1,3-dithiane. Org Lett 2014; 16:4396-9. [DOI: 10.1021/ol502276r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Junshan Lai
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Wenbin Du
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Lixia Tian
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Changgui Zhao
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xuegong She
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shouchu Tang
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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12
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Du W, Tian L, Lai J, Huo X, Xie X, She X, Tang S. Iron-Catalyzed Radical Oxidative Coupling Reaction of Aryl Olefins with 1,3-Dithiane. Org Lett 2014; 16:2470-3. [DOI: 10.1021/ol500850d] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Wenbin Du
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Lixia Tian
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Junshan Lai
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xing Huo
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xingang Xie
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xuegong She
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shouchu Tang
- School
of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
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13
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Zard SZ. Some intriguing mechanistic aspects of the radical chemistry of xanthates. J PHYS ORG CHEM 2012. [DOI: 10.1002/poc.2976] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Samir Z. Zard
- Ecole Polytechnique; Laboratoire de Synthèse Organique, UMR 7652; 91128; Palaiseau; France
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14
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Hawkins B, Paddock VL, Tölle N, Zard SZ. A Convenient Conversion of Terminal Alkenes into Homologous Unsaturated and Doubly Unsaturated Esters. Org Lett 2012; 14:1020-3. [DOI: 10.1021/ol203387r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bill Hawkins
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Victoria L. Paddock
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Nina Tölle
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
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15
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Yorimitsu H, Oshima K, Yoshida S. Tin-Hydride-Mediated Radical Addition of Alkyl Halides to 2-Methylene-1,3-dithiane Monoxide as a Ketene Equivalent. HETEROCYCLES 2010. [DOI: 10.3987/com-09-s(s)6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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17
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Yoshida S, Yorimitsu H, Oshima K. Radical Addition of Alkyl Halides to 2-Methylene-1,3-dithiane Monoxide as a Ketene Equivalent. CHEM LETT 2009. [DOI: 10.1246/cl.2009.248] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Goddard JP, Gomez C, Brebion F, Beauvière S, Fensterbank L, Malacria M. Highly diastereoselective ionic/radical domino reactions: single electron transfer induced cyclization of bis-sulfoxides. Chem Commun (Camb) 2007:2929-31. [PMID: 17622434 DOI: 10.1039/b705284g] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SET oxidation of bis-sulfinyl anions has enabled the uses of bis-sulfinyl radical as a synthetic equivalent of chiral acyl and methylene radicals involved in tandem reactions leading to the enantioselective construction of various carbo- and heterocyclic derivatives.
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Affiliation(s)
- Jean-Philippe Goddard
- Laboratoire de Chimie Organique (UMR CNRS 7611), Institut de chimie moléculaire FR 2769, Université Pierre et Marie Curie-Paris 6, case 229, 4 place Jussieu, 75252 Paris cedex 05, France
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19
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Güzel O, Salman A. Synthesis, antimycobacterial and antitumor activities of new (1,1-dioxido-3-oxo-1,2-benzisothiazol-2(3H)-yl)methyl N,N-disubstituted dithiocarbamate/O-alkyldithiocarbonate derivatives. Bioorg Med Chem 2006; 14:7804-15. [PMID: 16931027 DOI: 10.1016/j.bmc.2006.07.065] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Revised: 07/27/2006] [Accepted: 07/31/2006] [Indexed: 11/26/2022]
Abstract
Reaction of 2-chloromethylsaccharin with substituted potassium dithiocarbamates and substituted potassium dithiocarbonates furnished (1,1-dioxido-3-oxo-1,2-benzisothiazol-2(3H)-yl)methyl N,N-disubstituted dithiocarbamates (4-15) and (1,1-dioxido-3-oxo-1,2-benzisothiazol-2(3H)-yl)methyl O-alkyldithiocarbonates (16-20). The new derivatives were evaluated for in vitro antimycobacterial activity against Mycobacterium tuberculosis H37Rv. Compounds 4-13, 15, and 16-20 described herein showed moderate to good inhibitory activity. In particular, seven analogs 4, 5, 6, 13, and 7, 8, and 12 exhibited excellent MIC values of 1.56 and 0.78 microg/mL, respectively. Compounds 4, 5, 10, 12, 13, and 16 were selected and screened for antitumor activity. Among the tested compounds, 4 and 5 were found to be cytotoxic, especially against leukemia cell lines CCRF-CEM, HL-60(TB), RPMI-8226, and SR with log10GI50 values lower than -6.69, and against non-small cell lung cancer NCI-H522 cell line with log10GI50 values lower than -6.31. Compound 10 was cytotoxic against leukemia cell line HL-60(TB), whereas 16 displayed favorable cytotoxicity against ovarian cancer cell line OVCAR-3 with log10GI50 values of -6.31 and -7.45, respectively.
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Affiliation(s)
- Ozlen Güzel
- Istanbul University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 34116 Beyazit, Istanbul, Turkey.
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20
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Quiclet-Sire B, Zard SZ. Powerful CarbonCarbon Bond Forming Reactions Based on a Novel Radical Exchange Process. Chemistry 2006; 12:6002-16. [PMID: 16791885 DOI: 10.1002/chem.200600510] [Citation(s) in RCA: 180] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Xanthates and related derivatives have proved to be extremely useful for both inter- and intramolecular radical additions. The broad applicability of the intermolecular addition to un-activated olefins opens tremendous opportunities for synthesis, since various functional groups can be brought together under mild conditions and complex structures can be rapidly assembled. The presence of the xanthate in the product is also a powerful asset for further modifications, by both radical and non-radical pathways. Of special importance is the access to highly substituted aromatic and heteroaromatic derivatives and the synthesis of block polymers through a controlled radical polymerisation mediated by various thiocarbonylthio group containing agents (RAFT and MADIX processes).
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Affiliation(s)
- Béatrice Quiclet-Sire
- Laboratoire de Synthèse Organique associé au CNRS (UMR 7652), Département de Chimie, Ecole Polytechnique, 91128 Palaiseau, France
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21
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Bagal SK, de Greef M, Zard SZ. Cyano(ethoxycarbonothioylthio)methyl Benzoate: A Novel One-Carbon Radical Equivalent. Org Lett 2005; 8:147-50. [PMID: 16381589 DOI: 10.1021/ol052634m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Cyano(ethoxycarbonothioylthio)methyl benzoate 3 has been prepared and shown to be an excellent one-carbon radical equivalent that can be applied for the introduction of an acyl unit via xanthate transfer radical addition to olefins. The corresponding adducts can be further elaborated. A rare 1,5-nitrile translocation was also observed during the study.
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Affiliation(s)
- Sharanjeet K Bagal
- Laboratoire de Synthèse Organique associé au CNRS, Ecole Polytechnique, Palaiseau, France
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