Regio- and Enantioselective Synthesis of Dihydropyrido[1,2- a]indoles via Catalytic Asymmetric Annulative Allylic Alkylation

J Org Chem. 2022 Nov 18;87(22):15644-15652. doi: 10.1021/acs.joc.2c01873. Epub 2022 Nov 2.

Abstract

A palladium-catalyzed asymmetric annulative allylic alkylation reaction of 2-[(1H-indol-2-yl)methyl]malonates with (E)-but-2-ene-1,4-diyl dicarbonates is described, leading to the regio- and enantioselective synthesis of dihydropyrido[1,2-a]indoles with a chiral cyclic allyl stereocenter adjacent to the ring-junction nitrogen atom in moderate to good yields. The salient features of this protocol include mild conditions, a broad substrate scope, and good compatibility with substituents as well as high regio- and stereoselectivities, providing a catalytic asymmetric entry for fabricating chiral pyridoindole scaffolds.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkylation
  • Allyl Compounds*
  • Catalysis
  • Indoles
  • Stereoisomerism

Substances

  • Allyl Compounds
  • Indoles