1
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Park S, Myeong IS, Ham WH. Recent advances in the total synthesis of polyhydroxylated alkaloids via chiral oxazines. Org Biomol Chem 2024; 22:894-926. [PMID: 38230703 DOI: 10.1039/d3ob01624b] [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
This review summarizes recently established methodologies developed for the enantioselective and diastereoselective synthesis of chiral 1,3-oxazines. These compounds are of interest as advanced synthetic intermediates in the total synthesis of structurally complex and biologically active polyhydroxylated alkaloids such as (+)-1-deoxynojirimycin, (-)-anisomycin, (+)-castanospermine, (+)-casuarine, (-)-conduramine F-1, (-)-sphingofungin B, Neu5Ac methyl ester, and other natural products. The devised synthetic approach aims to offer a direct, efficient, and adaptable method for obtaining both pure enantiomers and pure diastereomers. It revolves around utilizing chiral building blocks like syn,syn-, syn,syn,anti-, syn,anti-, syn,anti,syn-, anti,syn-, anti,syn,syn-, and anti,syn,anti-oxazines. By integrating oxazine chemistry with established and innovative transformations, this approach enabled the synthesis of 30 polyhydroxylated amines across various studies conducted between 2007 and 2022.
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Affiliation(s)
- Seokhwi Park
- YS Life Science Co., Ltd, 207, Sujeong-ro, Jangan-myeon, Hwaseong-si, Gyeonggi-do, 18581, Republic of Korea.
| | - In-Soo Myeong
- College of Pharmacy, Daegu Catholic University, 13-13, Hayang-ro, Hayang-eup, Gyeongsan-si, Gyeongsangbuk-do, 38430, Republic of Korea.
| | - Won-Hun Ham
- YS Life Science Co., Ltd, 207, Sujeong-ro, Jangan-myeon, Hwaseong-si, Gyeonggi-do, 18581, Republic of Korea.
- School of Pharmacy, Sungkyunkwan University, 2066, Seobu-ro, Suwon-si, Gyeonggi-do, 16419, Republic of Korea
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2
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Yang LF, Wang QA, Li JH. Dual Palladium/Copper-Catalyzed anti-Selective Intermolecular Allenylsilylation of Terminal Alkynes: Entry to ( E)-Silyl Enallenes. Org Lett 2021; 23:6553-6557. [PMID: 34374538 DOI: 10.1021/acs.orglett.1c02364] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A palladium-/copper-cocatalyzed three-component trans-allenylsilylation of terminal alkynes with propargyl acetates and PhMe2SiBpin is described, which is driven by the regioselective allenylation of the alkyne with propargyl acetates and then silylation. This method allows the simultaneous incorporation of an allene and silicon across the C≡C bond and provides a highly chemo-, regio-, and stereoselective alkyne difunctionalization route to the synthesis of valuable (E)-silyl enallenes. The utility of this method is highlighted by late-stage derivatization of bioactive compounds.
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Affiliation(s)
- Liang-Feng Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People's Republic of China.,Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, People's Republic of China
| | - Qiu-An Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People's Republic of China
| | - Jin-Heng Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People's Republic of China.,Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, People's Republic of China.,State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 475004, People's Republic of China
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3
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Ferjancic Z, Saicic RN. Combining Organocatalyzed Aldolization and Reductive Amination: An Efficient Reaction Sequence for the Synthesis of Iminosugars. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100398] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Zorana Ferjancic
- University of Belgrade – Faculty of Chemistry Studentski trg 16, POB 51 11158 Belgrade 118 Serbia
| | - Radomir N. Saicic
- University of Belgrade – Faculty of Chemistry Studentski trg 16, POB 51 11158 Belgrade 118 Serbia
- Serbian Academy of Sciences and Arts Kneza Mihaila 35 11 000 Belgrade Serbia
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4
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Zhang Y, Guo J, Huang J, Fu Z. N-Heterocyclic Carbene-Catalyzed [4+2] Annulation of Acetates and β-Silyl Enones: Highly Enantioselective Synthesis of β-Silyl δ-Lactones. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202105002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Maity S, Hoz S. Mechanistic Vistas of Trivalent Nitrogen Compound Reduction by Samarium Diiodide. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001438] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sandeepan Maity
- Department of Applied Science and Humanities Invertis University Bareilly UP 243123 India
| | - Shmaryahu Hoz
- Department of Chemistry Bar-Ilan University Ramat Gan 5290002 Israel
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6
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Doler C, Friess M, Lackner F, Weber H, Fischer RC, Breinbauer R. Stereoselective synthesis of chiral thiol-containing 1,2-aminoalcohols via SmI2-mediated coupling. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Jamshaid F, Kondakal VV, Newman CD, Dobson R, João H, Rice CR, Mwansa JM, Thapa B, Hemming K. Cyclopropenones in the synthesis of indolizidine, pyrrolo[2,1-a]isoquinoline and indolizino[8,7-b]indole alkaloids. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131570] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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8
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Chen W, Sayyad A, Chen C, Chen Y, Cheng TR, Cheng W. Divergent Synthesis of Bicyclic Iminosugars: Preparation of (−)‐Swainsonine‐Based Alkaloids and Their Inhibition Study towardsα‐Human Mannosidases. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900637] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wei‐An Chen
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
| | - Ashik Sayyad
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
| | - Chiao‐Wen Chen
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
| | - Yu‐Hsin Chen
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
| | - Ting‐Jen R. Cheng
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
| | - Wei‐Chieh Cheng
- Genomics Research CenterAcademia Sinica 128 Academia Road, Sec. 2 Taipei 115 Taiwan
- Department of ChemistryNational Cheng-Kung University 1 University Road Tainan 701 Taiwan
- Department of Applied ChemistryNational Chiayi University 300, Xuefu Rd., East Dist. Chiayi 600 Taiwan
- Department of Medicinal and Applied ChemistryKaohsiung Medical University 100 Shih-Chuan 1st Rd. Kaohsiung 807 Taiwan
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9
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Beemelmanns C, Nitsch D, Bentz C, Reissig HU. Stereoselective Cascade Cyclizations with Samarium Diiodide to Tetracyclic Indolines: Precursors of Fluorostrychnines and Brucine. Chemistry 2019; 25:8780-8789. [PMID: 31033048 DOI: 10.1002/chem.201900087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/25/2019] [Indexed: 12/16/2022]
Abstract
A series of γ-indolylketones with fluorine, cyano or alkoxy substituents at the benzene moiety was prepared and subjected to samarium diiodide-promoted cyclization reactions. The desired dearomatizing ketyl cascade reaction forming two new rings proceeded in all cases with high diastereoselectivity, but with differing product distribution. In most cases, the desired annulated tetracyclic compounds were obtained in moderate to good yields, but as second product tetracyclic spirolactones were isolated in up to 29 % yield. The reaction rate was influenced by the substituents at the benzene moiety of the substrate as expected, with electron-accepting groups accelerating and electron-donating groups decelerating the cyclization process. In case of a difluoro-substituted γ-indolylketone a partial defluorination was observed. The intermediate samarium enolate of the tetracyclic products could be trapped by adding reactive alkylating agents as electrophiles delivering products with quarternary carbons. In the case of a dimethoxy-substituted tetracyclic cyclization product a subsequent reductive amination stereoselectively provided a pentacyclic compound that was subsequently N-protected and subjected to a regioselective elimination. The obtained functionalized pentacyclic product should be convertible into the alkaloid brucine by four well-established steps. Overall, the presented report shows that functionalized tetracyclic compounds with different substituents are rapidly available with the samarium diiodide cascade cyclization as crucial step. Hence, analogues of the landmark alkaloid strychnine, for example, with specific fluorine substitutions, should be easily accessible.
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Affiliation(s)
- Christine Beemelmanns
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany.,Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie, Beutenbergstraße 11a, 07745, Jena, Germany
| | - Dominik Nitsch
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
| | - Christoph Bentz
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
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10
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Abstract
Nitrones are important compounds and are highly useful in many aspects. The first part describes the methods for synthesis of nitrones, which are useful and environmentally friendly. Catalytic oxidations, condensations, and other useful reactions are described. The nitrones thus obtained are key intermediates for the synthesis of biologically important nitrogen compounds. The second part describes the fundamental transformations of nitrones, which will provide the strategies and means for the construction of nitrogen compounds. The reactions with nucleophiles or radicals, C-H functionalization, and various addition reactions are described. The last reactions are particularly important for highly selective carbon-carbon bond formations. 1,3-Dipolar cycloaddition reactions are excluded because the size of the review is limited and excellent reviews have been published in Chemical Reviews.
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Affiliation(s)
- Shun-Ichi Murahashi
- Department of Chemistry, Graduate School of Engineering Science , Osaka University , 1-3, Machikaneyama , Toyonaka , Osaka 560-8531 , Japan
| | - Yasushi Imada
- Department of Applied Chemistry , Tokushima University , 2-1, Minamijosanjima , Tokushima 770-8506 , Japan
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11
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Myeong IS, Ham WH. Stereoselective Syntheses of (+)-Broussonetine D and (+)-Australine via a Functionalized Pyrrolidine from an Extended Chiral 1,3-Oxazine. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801552] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- In-Soo Myeong
- School of Pharmacy; Sungkyunkwan University; Seobu-ro 2066, Suwon-si, Gyeonggi-do 16419 Republic of Korea
| | - Won-Hun Ham
- School of Pharmacy; Sungkyunkwan University; Seobu-ro 2066, Suwon-si, Gyeonggi-do 16419 Republic of Korea
- Yonsung Fine Chemicals Co., Ltd.; Sujeong-ro 207, Jangan-myeon, Hwaseong-si, Gyeonggi-do 18581 Republic of Korea
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12
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Zhang Y, Huang J, Guo Y, Li L, Fu Z, Huang W. Access to Enantioenriched Organosilanes from Enals and β‐Silyl Enones: Carbene Organocatalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800483] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuxia Zhang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Jie Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Yingying Guo
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Lin Li
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Zhenqian Fu
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
- Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Xi'an 710072 China
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13
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Zhang Y, Huang J, Guo Y, Li L, Fu Z, Huang W. Access to Enantioenriched Organosilanes from Enals and β‐Silyl Enones: Carbene Organocatalysis. Angew Chem Int Ed Engl 2018; 57:4594-4598. [DOI: 10.1002/anie.201800483] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 02/14/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Yuxia Zhang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Jie Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Yingying Guo
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Lin Li
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Zhenqian Fu
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
- Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Xi'an 710072 China
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14
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15
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Synthesis of Nitrogen Heterocycles Using Samarium(II) Iodide. Molecules 2017; 22:molecules22112018. [PMID: 29160806 PMCID: PMC6150357 DOI: 10.3390/molecules22112018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 11/11/2017] [Accepted: 11/13/2017] [Indexed: 11/19/2022] Open
Abstract
Nitrogen heterocycles represent vital structural motifs in biologically-active natural products and pharmaceuticals. As a result, the development of new, convenient and more efficient processes to N-heterocycles is of great interest to synthetic chemists. Samarium(II) iodide (SmI2, Kagan’s reagent) has been widely used to forge challenging C–C bonds through reductive coupling reactions. Historically, the use of SmI2 in organic synthesis has been focused on the construction of carbocycles and oxygen-containing motifs. Recently, significant advances have taken place in the use of SmI2 for the synthesis of nitrogen heterocycles, enabled in large part by the unique combination of high reducing power of this reagent (E1/2 of up to −2.8 V) with excellent chemoselectivity of the reductive umpolung cyclizations mediated by SmI2. In particular, radical cross-coupling reactions exploiting SmI2-induced selective generation of aminoketyl radicals have emerged as concise and efficient methods for constructing 2-azabicycles, pyrrolidines and complex polycyclic barbiturates. Moreover, a broad range of novel processes involving SmI2-promoted formation of aminyl radicals have been leveraged for the synthesis of complex nitrogen-containing molecular architectures by direct and tethered pathways. Applications to the synthesis of natural products have highlighted the generality of processes and the intermediates accessible with SmI2. In this review, recent advances involving the synthesis of nitrogen heterocycles using SmI2 are summarized, with a major focus on reductive coupling reactions that enable one-step construction of nitrogen-containing motifs in a highly efficient manner, while taking advantage of the spectacular selectivity of the venerable Kagan’s reagent.
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16
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Kim JY, Kang BC, Ryu DH. Catalytic Asymmetric Roskamp Reaction of Silyl Diazoalkane: Synthesis of Enantioenriched α-Silyl Ketone. Org Lett 2017; 19:5936-5939. [PMID: 29052993 DOI: 10.1021/acs.orglett.7b02928] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A catalytic enantioselective Roskamp reaction of silyl diazoalkane to synthesize a highly optically active α-silyl ketone from aldehydes is described. In the presence of a chiral oxazaborolidinium ion catalyst, the reaction provides α-chiral silyl ketones with good yields (up to 97%) and high enantioselectivities (up to >99% ee). In addition, a one-pot procedure using an asymmetric Roskamp/reduction strategy gives highly optically active syn-β-hydroxysilane in good yields (up to 94%) with high enantioselectivities (up to 99% ee) and syn stereoselectivities (>20:1).
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Affiliation(s)
- Jae Yeon Kim
- Department of Chemistry, Sungkyunkwan University , Suwon, 440-746, Korea
| | - Byung Chul Kang
- Department of Chemistry, Sungkyunkwan University , Suwon, 440-746, Korea
| | - Do Hyun Ryu
- Department of Chemistry, Sungkyunkwan University , Suwon, 440-746, Korea
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17
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Huang HM, Procter DJ. Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds. Angew Chem Int Ed Engl 2017; 56:14262-14266. [DOI: 10.1002/anie.201708354] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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18
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Huang HM, Procter DJ. Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708354] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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19
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Tangara S, Aupic C, Kanazawa A, Poisson JF, Py S. Aziridination of Cyclic Nitrones Targeting Constrained Iminosugars. Org Lett 2017; 19:4842-4845. [DOI: 10.1021/acs.orglett.7b02283] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Salia Tangara
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Clara Aupic
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Alice Kanazawa
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Jean-François Poisson
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Sandrine Py
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
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20
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Ran GY, Gong M, Yue JF, Yang XX, Zhou SL, Du W, Chen YC. Asymmetric Cascade Assembly of 1,2-Diaza-1,3-dienes and α,β-Unsaturated Aldehydes via Dienamine Activation. Org Lett 2017; 19:1874-1877. [PMID: 28350461 DOI: 10.1021/acs.orglett.7b00636] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guang-Yao Ran
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ming Gong
- Ruian City People’s Hospital, Ruian 325200, Zhejiang
Province, China
| | - Jing-Fei Yue
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Xing-Xing Yang
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Su-Lan Zhou
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Wei Du
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying-Chun Chen
- Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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21
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Huang HM, Procter DJ. Dearomatizing Radical Cyclizations and Cyclization Cascades Triggered by Electron-Transfer Reduction of Amide-Type Carbonyls. J Am Chem Soc 2017; 139:1661-1667. [DOI: 10.1021/jacs.6b12077] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
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22
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Huang HM, Bonilla P, Procter DJ. Selective construction of quaternary stereocentres in radical cyclisation cascades triggered by electron-transfer reduction of amide-type carbonyls. Org Biomol Chem 2017; 15:4159-4164. [DOI: 10.1039/c7ob00739f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Radical cyclisation cascades triggered by electron-transfer to amide-type carbonyls using SmI2–H2O–LiBr, result in the selective construction of quaternary carbon stereocentres.
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Affiliation(s)
| | - Pablo Bonilla
- School of Chemistry
- University of Manchester
- Manchester
- UK
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23
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Racine E, Burchak ON, Py S. Synthesis of α-Acyloxynitrones and Reactivity towards Samarium Diiodide. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600478] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Emilie Racine
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
| | | | - Sandrine Py
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
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24
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Shi S, Lalancette R, Szostak R, Szostak M. Highly Chemoselective Synthesis of Indolizidine Lactams by SmI2
-Induced Umpolung of the Amide Bond via Aminoketyl Radicals: Efficient Entry to Alkaloid Scaffolds. Chemistry 2016; 22:11949-53. [DOI: 10.1002/chem.201602717] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Shicheng Shi
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Roger Lalancette
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Roman Szostak
- Department of Chemistry; Wroclaw University; 14 F. Joliot-Curie Street Wroclaw 50-383 Poland
| | - Michal Szostak
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
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25
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Huang HM, Procter DJ. Radical–Radical Cyclization Cascades of Barbiturates Triggered by Electron-Transfer Reduction of Amide-Type Carbonyls. J Am Chem Soc 2016; 138:7770-5. [DOI: 10.1021/jacs.6b04086] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
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26
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Martinez ST, Belouezzane C, Pinto AC, Glasnov T. Synthetic Strategies towards the Azabicyclo[3.3.0]-Octane Core of Natural Pyrrolizidine Alkaloids. An Overview. ORG PREP PROCED INT 2016. [DOI: 10.1080/00304948.2016.1165058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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27
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Shi S, Szostak R, Szostak M. Proton-coupled electron transfer in the reduction of carbonyls using SmI2–H2O: implications for the reductive coupling of acyl-type ketyl radicals with SmI2–H2O. Org Biomol Chem 2016; 14:9151-9157. [DOI: 10.1039/c6ob01621a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The feasibility of concerted PCET in the reduction of carbonyl groups using SmI2–H2O is quantitatively assessed.
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Affiliation(s)
- Shicheng Shi
- Department of Chemistry
- Rutgers University
- Newark
- USA
| | - Roman Szostak
- Department of Chemistry
- Wroclaw University
- Wroclaw 50-383
- Poland
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28
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Malik M, Jarosz S. Synthesis of polyhydroxylated pyrrolidines from sugar-derived bromonitriles through a cascade addition of allylmagnesium bromide/cyclization/reduction. Org Biomol Chem 2016; 14:1764-76. [DOI: 10.1039/c5ob02573g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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D'Adamio G, Parmeggiani C, Goti A, Cardona F. Gold Supported on Silica Catalyzes the Aerobic Oxidation ofN,N-Disubstituted Hydroxylamines to Nitrones. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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30
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Lin CW, Hong BC, Chang WC, Lee GH. A New Approach to Nitrones through Cascade Reaction of Nitro Compounds Enabled by Visible Light Photoredox Catalysis. Org Lett 2015; 17:2314-7. [PMID: 25895096 DOI: 10.1021/acs.orglett.5b00684] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A series of nitroalkanes were efficiently transformed to alkylnitrones using a visible light irradiation photocatalytic process. The mild, efficient, and environmentally benign reaction method, involving dynamic reciprocations of cascade pathways, comprises a mixture of a Ru(bpy)3Cl2 photoredox catalyst and DIPIBA or Hünig's base in CH3CN. Notably, DIPIBA was found to be the best additive for the cross condensation reaction of nitroalkanes with aldehydes. The structures of appropriate products were confirmed by X-ray analysis.
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Affiliation(s)
- Cheng-Wei Lin
- †Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C
| | - Bor-Cherng Hong
- †Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C
| | - Wan-Chen Chang
- †Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C
| | - Gene-Hsiang Lee
- ‡Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
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31
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Marquès S, Schuler M, Tatibouët A. Preparation of Pyranose-Based ThioimidateN-Oxides (TINOs). European J Org Chem 2015. [DOI: 10.1002/ejoc.201403619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Li YX, Shimada Y, Sato K, Kato A, Zhang W, Jia YM, Fleet GWJ, Xiao M, Yu CY. Synthesis and Glycosidase Inhibition of Australine and Its Fluorinated Derivatives. Org Lett 2015; 17:716-9. [DOI: 10.1021/ol503728e] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi-Xian Li
- Beijing
National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory
of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yousuke Shimada
- Department
of Hospital Pharmacy, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Kasumi Sato
- Department
of Hospital Pharmacy, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Atsushi Kato
- Department
of Hospital Pharmacy, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Wei Zhang
- Beijing
National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory
of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yue-Mei Jia
- Beijing
National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory
of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - George W. J. Fleet
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
- National
Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Min Xiao
- State
Key Laboratory of Microbial Technology and National Glycoengineering
Research Center, Shandong University, Jinan 250100, P. R. China
| | - Chu-Yi Yu
- Beijing
National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory
of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- National
Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, P. R. China
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33
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Shen M, Tu Y, Xie G, Niu Q, Mao H, Xie T, Flowers RA, Lv X, Wang X. Allylsamarium Bromide-Mediated Cascade Cyclization of Homoallylic Esters. Synthesis of 2-(2-Hydroxyalkyl)cyclopropanols and 2-(2-Hydroxyethyl)bicyclo[2.1.1]hexan-1-ols. J Org Chem 2015; 80:52-61. [PMID: 25427109 DOI: 10.1021/jo501797w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In continuation of our previous study on the intramolecular reductive coupling of simple homoallylic esters promoted by allylSmBr/HMPA/H2O, which afforded a facile synthesis of 2-(2-hydroxyalkyl)cyclopropanols, here we report the reductive cascade cyclization of but-3-enyl but-3-enoates mediated by allylSmBr/HMPA/CuCl2·2H2O, in which the two C═C bonds were successively coupled to allow the construction of the structurally interesting bridged bicyclic tertiary alcohols. Thus, the 2-(2-hydroxyethyl)bicyclo[2.1.1]hexan-1-ols were prepared in moderate to good yields with excellent diastereoselectivity.
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Affiliation(s)
- Mengmeng Shen
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Yawei Tu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Guanqun Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Qingsheng Niu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Hui Mao
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Tingting Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Robert A Flowers
- ‡Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Xin Lv
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Xiaoxia Wang
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
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34
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Alcaide A, Trapero A, Pérez Y, Llebaria A. Galacto configured N-aminoaziridines: a new type of irreversible inhibitor of β-galactosidases. Org Biomol Chem 2015; 13:5690-7. [DOI: 10.1039/c5ob00532a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Aminoaziridines are potent irreversible inhibitors of galactosidases.
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Affiliation(s)
- Anna Alcaide
- Medicinal Chemistry Laboratory (MedChemLab)
- Departament de Química Biomèdica
- Institut de Química Avançada de Catalunya (IQAC–CSIC)
- Barcelona
- Spain
| | - Ana Trapero
- Medicinal Chemistry Laboratory (MedChemLab)
- Departament de Química Biomèdica
- Institut de Química Avançada de Catalunya (IQAC–CSIC)
- Barcelona
- Spain
| | - Yolanda Pérez
- NMR Unit
- Institut de Química Avançada de Catalunya (IQAC–CSIC)
- Barcelona
- Spain
| | - Amadeu Llebaria
- Medicinal Chemistry Laboratory (MedChemLab)
- Departament de Química Biomèdica
- Institut de Química Avançada de Catalunya (IQAC–CSIC)
- Barcelona
- Spain
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35
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Szostak M, Spain M, Eberhart AJ, Procter DJ. Mechanism of SmI2/Amine/H2O-Promoted Chemoselective Reductions of Carboxylic Acid Derivatives (Esters, Acids, and Amides) to Alcohols. J Org Chem 2014; 79:11988-2003. [DOI: 10.1021/jo5018525] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Michal Szostak
- Department
of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Malcolm Spain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Andrew J. Eberhart
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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36
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Abstract
This review covers pyrrolizidine alkaloids isolated from natural sources. Topics include: aspects of structure, isolation, and biological/pharmacological studies; total syntheses of necic acids, necine bases and closely-related non-natural analogues.
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Affiliation(s)
- Jeremy Robertson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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37
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Xu J, Chen J, Yang Q, Ding L, Liu X, Xu D, Zhao B. Synthesis of α-Methylidene-γ-amino Acid Esters from Aldehydesviaan Aminative Umpolung Strategy. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400210] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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38
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Sun L, Mellah M. Efficient Electrosynthesis of SmCl2, SmBr2, and Sm(OTf)2 from a “Sacrificial” Samarium Anode: Effect of nBu4NPF6 on the Reactivity. Organometallics 2014. [DOI: 10.1021/om500222a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Linhao Sun
- Equipe
de Catalyse Moléculaire, University Paris-Sud, ICMMO, UMR 8182, Orsay, F-91405 France
| | - Mohamed Mellah
- Equipe
de Catalyse Moléculaire, University Paris-Sud, ICMMO, UMR 8182, Orsay, F-91405 France
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39
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Szostak M, Spain M, Procter DJ. Ketyl-Type Radicals from Cyclic and Acyclic Esters are Stabilized by SmI2(H2O)n: The Role of SmI2(H2O)n in Post-Electron Transfer Steps. J Am Chem Soc 2014; 136:8459-66. [DOI: 10.1021/ja503494b] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Michal Szostak
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
| | - Malcolm Spain
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
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40
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Szostak M, Fazakerley NJ, Parmar D, Procter DJ. Cross-Coupling Reactions Using Samarium(II) Iodide. Chem Rev 2014; 114:5959-6039. [DOI: 10.1021/cr400685r] [Citation(s) in RCA: 290] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Michal Szostak
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Neal J. Fazakerley
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Dixit Parmar
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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41
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Szostak M, Spain M, Procter DJ. Determination of the Effective Redox Potentials of SmI2, SmBr2, SmCl2, and their Complexes with Water by Reduction of Aromatic Hydrocarbons. Reduction of Anthracene and Stilbene by Samarium(II) Iodide–Water Complex. J Org Chem 2014; 79:2522-37. [DOI: 10.1021/jo4028243] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Michal Szostak
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
| | - Malcolm Spain
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
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42
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Iminosugars: Therapeutic Applications and Synthetic Considerations. TOPICS IN MEDICINAL CHEMISTRY 2014. [DOI: 10.1007/7355_2014_50] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
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43
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Szostak M, Lyons SE, Spain M, Procter DJ. Mechanistic investigation of the selective reduction of Meldrum's acids to β-hydroxy acids using SmI2and H2O. Chem Commun (Camb) 2014; 50:8391-4. [DOI: 10.1039/c4cc03216k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Rizzo A, Harutyunyan SR. Azabicycles construction: the transannular ring contraction with N-protected nucleophiles. Org Biomol Chem 2014; 12:6570-9. [DOI: 10.1039/c4ob01311e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Synthetic strategies are one of the most critical factors for the success of a synthetic campaign, but most importantly they are crucial for the economy and the efficiency of the sequence.
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Affiliation(s)
- Antonio Rizzo
- University of Groningen
- Stratingh Institute
- Groningen, Netherlands
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45
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Jasiński M, Moreno-Clavijo E, Reissig HU. Synthesis of a Series of Enantiopure Polyhydroxylated Bicyclic N-Heterocycles from anL-Erythrose-Derived Nitrone and Alkoxyallenes. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301406] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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46
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Lieou Kui E, Kanazawa A, Poisson JF, Py S. Unprecedented base-promoted nucleophilic addition of diazoesters to nitrones. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Szostak M, Spain M, Procter DJ. Uncovering the importance of proton donors in TmI2-promoted electron transfer: facile C-N bond cleavage in unactivated amides. Angew Chem Int Ed Engl 2013; 52:7237-41. [PMID: 23828793 PMCID: PMC4265963 DOI: 10.1002/anie.201303178] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Michal Szostak
- School of Chemistry, University of ManchesterOxford Road, Manchester M13 9PL (UK)
| | - Malcolm Spain
- School of Chemistry, University of ManchesterOxford Road, Manchester M13 9PL (UK)
| | - David J Procter
- School of Chemistry, University of ManchesterOxford Road, Manchester M13 9PL (UK)
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48
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Stereocomplementary Routes to Hydroxylated Nitrogen Heterocycles: Total Syntheses of Casuarine, Australine, and 7-epi-Australine. Chemistry 2013; 19:10595-604. [DOI: 10.1002/chem.201301320] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Indexed: 11/07/2022]
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49
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Nocquet PA, Hazelard D, Gruntz G, Compain P. Synthesis of 4-membered carbasugars by way of stereoselective SmI2-mediated aldehyde-alkene cyclization. J Org Chem 2013; 78:6751-7. [PMID: 23745733 DOI: 10.1021/jo400732a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A stereodivergent synthesis of the first examples of 4-membered carbasugars has been achieved from vitamin C by way of an efficient intramolecular SmI2-mediated aldehyde-alkene coupling. In this key step, cylobutanes with four contiguous asymmetric centers are generated with a high level of stereocontrol.
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Affiliation(s)
- Pierre-Antoine Nocquet
- Laboratoire de Synthèse Organique et Molécules Bioactives, Université de Strasbourg/CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, 25 rue Becquerel, 67087 Strasbourg, France
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50
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Szostak M, Spain M, Procter DJ. Uncovering the Importance of Proton Donors in TmI2-Promoted Electron Transfer: Facile CN Bond Cleavage in Unactivated Amides. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303178] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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