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SCIENCE CHINA Chemistry, Volume 62 , Issue 11 : 1542-1546(2019) https://doi.org/10.1007/s11426-019-9627-x

Trifluoromethyl radical triggered radical cyclization of N-benzoyl ynamides leading to isoindolinones

Maud Cassé 1,2, Christian Nisole 2, Héloïse Dossmann 1, Yves Gimbert 1,3, Jean-Marie Fourquez 2, Laure Haberkorn 2, Cyril Ollivier 1,*, Louis Fensterbank 1,*
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  • ReceivedAug 30, 2019
  • AcceptedSep 25, 2019
  • PublishedOct 21, 2019
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Abstract


Acknowledgment

We thank Sorbonne Université, CNRS and Servier for funding. The authors wish to acknowledge the analytical department of IDRS - Servier for the compounds analyses (IR, NMR, HR-MS) and the SRIMC department for the syntheses on big scale. This work was granted access to the high performance computing (HPC) resources of the HPCaVe Centre at Sorbonne Université and to the HPC resources of IDRIS under the allocation 2018-A0050810312 made by GENCI. The authors wish to acknowledge support from the ICMG Chemistry Nanobio Platform-PCECIC, Grenoble, for calculations facilities. Jérémy Forté is acknowledged for the X-ray diffraction analyses as well as Conor Dent Cullen and Scott Warchal for proofreading the manuscript.


Interest statement

The authors declare that they have no conflict of interest.


Supplement

Supporting information

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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    Scheme 1

    Ynamides as radical acceptors: context and objective of the work (color online).

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    Figure 1

    DFT-computed structure of AE and corresponding Kohn-Sham orbitals (color online).

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    Scheme 2

    Synthesis route for the ynamide 3a (color online).

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    Scheme 3

    By-products formed from the use of the Togni II reagent.

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    Scheme 4

    Scope of the process (E/Z ratio precised).

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    Scheme 5

    Energetic profile for the cyclisation of the ynamide: energies given are ΔG in kcal/mol (color online).

  • Table 1   Optimization of the reaction conditions

    Entry

    Catalyst

    CF3 reagent

    Solvent

    Time

    Yield (%), E/Z

    1

    Ru(bpy)3Cl2

    Togni II

    MeCN

    48 h

    36, 97:3

    2

    Ir(ppy)2(dtbpy)·PF6

    Togni II b)

    MeCN

    21 h

    45, 50:50

    3

    Ir(ppy)3

    Togni II

    MeCN

    6 h

    71, 86:14

    4

    4CzIPN b)

    Togni II

    MeCN

    4 h

    50, 92:8

    5

    Ir(ppy)3 b)

    Umemoto

    MeCN

    23 h

    14 c), 100:0

    6

    Ir(ppy)3

    Togni I

    MeCN

    5 h

    64 d), 81:19

    7

    Ir(ppy)3

    Togni II

    Acetone

    4 h

    54, 85:15

    8

    Ir(ppy)3

    Togni II

    DMF

    3 h

    51, 62:38

    9

    Ir(ppy)3

    Togni II

    tBuOH

    24 h

    55, 75:25

    10

    Ir(ppy)3

    Togni II

    AcOEt

    3 h

    62, 92:8

    Reaction conditions: N-benzyl-N-ethynyl-benzamide (3a, 0.2 mmol,1 equiv.), CF3 reagent (1.2 equiv.), catalyst (2.5 mol% unless otherwise specified), solvent (0.1 M, 2 mL), freeze pump, irradiation under blue LEDs for 3–48 h; b) catalyst loading: 5 mol%; c) addition 1.2 equiv. of Li2CO3; d) 2 trials on a 1 mmol scale.

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