Organocatalytic one-pot asymmetric synthesis of 4H,5H-pyrano[2,3-c]pyrazoles

Org Lett. 2012 Aug 17;14(16):4254-7. doi: 10.1021/ol301983f. Epub 2012 Aug 1.

Abstract

An efficient one pot asymmetric synthesis of tetrahydropyrano[2,3-c]pyrazoles has been developed. This class of biologically active heterocycles can be obtained via a secondary amine catalyzed asymmetric Michael/Wittig/oxa-Michael reaction sequence. Remarkably, the title compounds were accessible in good to very good yields and very good to excellent enantioselectivities after a single purification step.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Heterocyclic Compounds, 2-Ring / chemical synthesis*
  • Heterocyclic Compounds, 2-Ring / chemistry
  • Molecular Structure
  • Pyrans / chemical synthesis*
  • Pyrans / chemistry
  • Pyrazoles / chemical synthesis*
  • Pyrazoles / chemistry
  • Stereoisomerism

Substances

  • Heterocyclic Compounds, 2-Ring
  • Pyrans
  • Pyrazoles