Structural and Computational Investigation of Intramolecular N···H Interactions in α‐ and β‐Fluorinated 7‐Azaindoline Amides

  • Lennart Brewitz
    Institute of Microbial Chemistry (BIKAKEN) Tokyo Kamiosaki 3‐14‐23 141‐0021 Shinagawa‐ku, Tokyo Japan
  • Hidetoshi Noda
    Institute of Microbial Chemistry (BIKAKEN) Tokyo Kamiosaki 3‐14‐23 141‐0021 Shinagawa‐ku, Tokyo Japan
  • Naoya Kumagai
    Institute of Microbial Chemistry (BIKAKEN) Tokyo Kamiosaki 3‐14‐23 141‐0021 Shinagawa‐ku, Tokyo Japan
  • Masakatsu Shibasaki
    Institute of Microbial Chemistry (BIKAKEN) Tokyo Kamiosaki 3‐14‐23 141‐0021 Shinagawa‐ku, Tokyo Japan

Abstract

<jats:p>Novel fluorinated <jats:italic>N</jats:italic><jats:sup>1</jats:sup>‐acylated 7‐azaindolines have been synthesized and their conformations analyzed by X‐ray diffraction and NMR spectroscopy: Unusual intramolecular interactions between the 7‐nitrogen and amide α‐hydrogen atoms were identified. The strength of these interactions correlate with the electron‐withdrawing character of the amide α substituents. A combination of experimental and computational approaches revealed a significant substituent effect when the substituent (H, OMe, F, CN) at the 4‐position of the 7‐azaindoline scaffold was varied. As these intramolecular interactions also occur in non‐fluorinated <jats:italic>N</jats:italic><jats:sup>1</jats:sup>‐acylated 7‐azaindolines and similar heterocycles, this study is relevant to medicinal chemistry: The results will facilitate the prediction of the predominant conformations of <jats:italic>N</jats:italic><jats:sup>1</jats:sup>‐acylated‐7‐azaindoline‐containing bioactive molecules and thus potentially contribute to drug discovery programs.</jats:p>

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