Substrate-Dependent Regioselectivity: Pd/PTC Cooperatively Catalyzed Domino Heck/Allylation of Allenamides with α-Carbon of Carbonyl Compounds

J Org Chem. 2022 Nov 4;87(21):14284-14298. doi: 10.1021/acs.joc.2c01768. Epub 2022 Oct 14.

Abstract

A Pd/phase-transfer catalyst cooperatively catalyzed domino Heck/allylation reaction is first reported, which represents interesting substrate-dependent regioselectivity. Under the same conditions, Ts-protected N-(2-iodophenyl)allenamides produced only linear allylation products, while Cbz, Ac, or Boc-protected N-(2-iodophenyl)allenamides and N-(2-iodobenzoyl)allenamides with various compounds generated branch allylation products with an exocylic C═C bond and two vicinal stereocenters. Up-scale syntheses and diverse fused cyclization transformations of products were then carried out. The enantioselective version for the domino process was studied.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon*
  • Catalysis
  • Cyclization
  • Molecular Structure
  • Organic Chemicals
  • Palladium* / chemistry

Substances

  • Palladium
  • Carbon
  • Organic Chemicals