Asymmetric Synthesis of Spiro[3,2'-morpholine-oxindoles] Derivatives via the [5 + 1] Annulation Reaction

J Org Chem. 2021 Dec 3;86(23):16815-16823. doi: 10.1021/acs.joc.1c02037. Epub 2021 Nov 11.

Abstract

An efficacious method in which BINOL-type chiral imidodiphosphoric acid catalyzed the asymmetric [5 + 1] annulation reaction of 2-pyrrolylphenol with 1-methylindoline-2,3-dione was established. The strategy tolerated a broad substrate scope, and 30 examples were obtained. A range of enantioenriched spiro[3,2'-morpholine-oxindole] derivatives which incorporate a tertiary stereocenter, with moderate to excellent yields (up to 96%) and enantioselectivities (up to 99%) under mild conditions, was delivered.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Indoles
  • Morpholines
  • Oxindoles
  • Spiro Compounds*
  • Stereoisomerism

Substances

  • Indoles
  • Morpholines
  • Oxindoles
  • Spiro Compounds