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Synthesis of 1,2-Fused Tricyclic Indoles via Cu-/Base-Mediated Hydroamination of Alkynes.

Ryoga HojoSpencer ShortMukund Jha
Published in: The Journal of organic chemistry (2019)
Synthesis of a variety of 1,2-fused tricyclic S-containing indoles is reported starting from indole sulfides tethered with terminal and internal alkynes via a key hydroamination step. Cu-catalyzed hydroamination reactions resulted in the exclusive formation of tricycles possessing an exocyclic methylene moiety, whereas base-mediated conditions led to thiazolo[3,2-a]indoles. Indole sulfides with internal alkyne functionality produced 2H-[1,3]thiazino[3,2-a]indoles under Cu-catalysis.
Keyphrases
  • aqueous solution
  • metal organic framework
  • room temperature