Enantioselective Total Synthesis of (+)-Hinckdentine A via a Catalytic Dearomatization Approach

J Am Chem Soc. 2016 Nov 9;138(44):14578-14581. doi: 10.1021/jacs.6b10237. Epub 2016 Oct 25.

Abstract

Optically pure hinckdentine A was synthesized on a 300 mg scale via an asymmetric catalysis-based strategy. The key steps to the first asymmetric synthesis involved (i) enantioselective dearomative cyclization of an achiral N-acyl indole that allowed for the efficient construction of the key polycyclic indoline intermediate with a crucial tetrasubstituted stereogenic carbon center, (ii) Beckmann fragmentation-mediated ring expansion, (iii) rearrangement-based introduction of an anilinic nitrogen atom, (iv) regioselective tribromination, and (v) final closure of the cyclic amidine moiety.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Cyclization
  • Lactams / chemistry
  • Molecular Structure
  • Palladium / chemistry
  • Quinazolines / chemistry*
  • Stereoisomerism

Substances

  • Lactams
  • Quinazolines
  • hinckdentine A
  • Palladium