Synthesis of Highly Substituted Quinolines via a Tandem Ynamide Benzannulation/Iodocyclization Strategy

J Org Chem. 2015 Dec 4;80(23):11794-805. doi: 10.1021/acs.joc.5b01648. Epub 2015 Aug 14.

Abstract

A two-stage "tandem strategy" for the regiocontrolled synthesis of very highly substituted quinolines is described. Benzannulation based on the reaction of cyclobutenones or diazo ketones with N-propargyl-substituted ynamides proceeds via a cascade of several pericyclic reactions to generate multiply substituted aniline derivatives. In the second stage of the tandem strategy, triflate derivatives of the phenolic benzannulation products undergo Larock cyclization upon exposure to iodine to form products that are further elaborated by methods such as palladium-catalyzed coupling to generate quinolines that can be substituted at every position of the bicyclic system.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Benzene Derivatives / chemistry*
  • Catalysis
  • Cyclization
  • Molecular Structure
  • Quinolines / chemical synthesis*
  • Quinolines / chemistry

Substances

  • Benzene Derivatives
  • Quinolines