Orthogonal Syntheses of γ-Carbolinone and Spiro[pyrrolidinone-3,3']indole Derivatives in One Pot through Reaction Telescoping

J Org Chem. 2021 Apr 2;86(7):5234-5244. doi: 10.1021/acs.joc.1c00141. Epub 2021 Mar 15.

Abstract

Herein we report a series of telescoping methodologies for one pot synthesis of biologically relevant γ-carboline derivatives 6 and spiro[pyrrolidinone-3,3']indole 7. Initially the three consecutive steps of cyclopropanation, phthalimide deprotection, and Boc-deprotection have been congregated in a single reaction vessel to afford a ∼1:1 mixture of 6 and 7. Next, careful optimization of the reaction sequence and the conditions generated an orthogonal approach to access compounds 6 and 7 exclusively. Air oxidation of the γ-carbolinones 6 afforded aromatic γ-carbolines 8.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbolines*
  • Indoles
  • Oxidation-Reduction
  • Pyrrolidinones*
  • Stereoisomerism

Substances

  • Carbolines
  • Indoles
  • Pyrrolidinones