One-pot organocatalytic enantioselective Michael-Michael-aldol-Henry reaction cascade. A facile entry to the steroid system with six contiguous stereogenic centers

Org Lett. 2014 May 16;16(10):2724-7. doi: 10.1021/ol501011t. Epub 2014 May 5.

Abstract

An expedited method has been developed for the enantioselective synthesis of highly functionalized steroid systems containing six contiguous stereogenic centers with high enantioselectivities (99% ee). The one-pot methodology comprises a cascade of organocatalytic Michael-Michael-aldol-Henry reactions of 7-nitrohept-3-en-2-one and 5-(1-methyl-2,5-dioxocyclopentyl)pent-2-enal. The structure and absolute configuration of the products were confirmed by X-ray analyses of appropriate products.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aldehydes / chemistry*
  • Catalysis
  • Crystallography, X-Ray
  • Molecular Conformation
  • Molecular Structure
  • Stereoisomerism
  • Steroids / chemical synthesis*
  • Steroids / chemistry

Substances

  • Aldehydes
  • Steroids
  • 2-pentenal
  • 3-hydroxybutanal