Facile synthesis of 11-carboxamido-androst-4,9(11)-dienes via palladium-catalyzed aminocarbonylation

Steroids. 2007 Jul;72(8):627-32. doi: 10.1016/j.steroids.2007.04.004. Epub 2007 May 7.

Abstract

11-Carboxamido-androst-4,9(11)-dienes were synthesized from the corresponding 11-iodo-androst-4,9(11)-diene derivative in palladium-catalyzed aminocarbonylation reaction under mild reaction conditions. The synthesis of the iodo-alkene substrate is based on the transformation of the 11-keto derivative to hydrazone, which was treated with iodine in the presence of a base (1,1,3,3-tetramethyl guanidine). The 11-carboxamides were synthesized in moderate to high isolated yields by using simple alkyl/arylamines or amino acid methylesters as N-nucleophiles. The highly active palladium catalysts enable the homogeneous catalytic functionalization at one of the most hindered position (C-11) of the steroidal skeleton.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkenes
  • Androstadienes / chemical synthesis*
  • Androstadienes / chemistry
  • Carbon / chemistry*
  • Catalysis
  • Molecular Conformation
  • Molecular Structure
  • Palladium / chemistry*
  • Polyenes / chemical synthesis*
  • Polyenes / chemistry
  • Steroids / chemical synthesis*
  • Steroids / chemistry

Substances

  • Alkenes
  • Androstadienes
  • Polyenes
  • Steroids
  • Palladium
  • Carbon