4.8 Article

Catalysis Based on C-Iπ Halogen Bonds: Electrophilic Activation of 2-Alkenylindoles by Cationic Halogen-Bond Donors for [4+2] Cycloadditions

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 30, Pages 10220-10224

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201904689

Keywords

cycloaddition; density-functional calculations; halogen bonding; heterocycles; noncovalent bonds

Funding

  1. JSPS KAKENHI [JP19H02709, JP16H01004, JP18H04237, JP18H04660, 19K15553]
  2. Futaba Research Grant Program of the Futaba Foundation
  3. Grants-in-Aid for Scientific Research [19K15553] Funding Source: KAKEN

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Homo- and cross-[4+2] cycloadditions of 2-alkenylindoles, catalyzed by cationic halogen-bond donors, were developed. Under mild reaction conditions, 3-indolyl-substituted tetrahydrocarbazole derivatives were obtained in good to excellent yields. Experimental and quantum calculation studies revealed that the electrophilic activation of 2-alkenylindoles was achieved by C-I pi halogen bonds.

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