Organocatalytic hetero [4+2] cycloaddition reactions of 2-(1-alkynyl)-2-alkene-1-ones: metal-free access to highly substituted 4H-pyrans

Xiuzhao Yu, Zhongyan Cao, Junliang Zhang
  • Organic & Biomolecular Chemistry, January 2010, Royal Society of Chemistry
  • DOI: 10.1039/c0ob00334d