Twisted amide reduction under Wolff-Kishner conditions: synthesis of a benzo-1-aza-adamantane derivative

J Am Chem Soc. 2003 Mar 19;125(11):3268-72. doi: 10.1021/ja028152c.

Abstract

A synthesis of 4,5-benzo-1-aza-tricyclo[4.3.1.1(3,8)]undecane (1), a benzo-1-aza-adamantane derivative, is described and features a previously unknown application of the Wolff-Kishner reduction of a nonresonance stabilized or "twisted" amide. An intermediate amino ester is converted to a severely "twisted amide", which, when exposed to hydrazine in alcohol, provides the corresponding "twisted" amino hydrazone. Wolff-Kishner conditions (KOH/ethylene glycol, 200 degrees C) provide the reduced target 1 without hydrolysis to amino acid derivatives. These operations are conveniently performed in a single flask in high yield.

MeSH terms

  • Adamantane / analogs & derivatives*
  • Adamantane / chemical synthesis
  • Adamantane / chemistry
  • Amides / chemistry*
  • Aza Compounds / chemical synthesis*
  • Aza Compounds / chemistry
  • Crystallography, X-Ray
  • Molecular Structure
  • Oxidation-Reduction

Substances

  • Amides
  • Aza Compounds
  • Adamantane