Condensation of propargylic alcohols with 1,3-dicarbonyl compounds and 4-hydroxycoumarins in ionic liquids (ILs)
作者:Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1016/j.tetlet.2011.10.021
日期:2011.12
Propargylicalcohols are activated toward 1,3-diketones by Lewis or Brønstedacidic ionic liquids (ILs) without an added catalyst, but significantly better conversions are achieved with metallic triflates [in particular Sc(OTf)3 and Ln(OTf)3] and bismuth nitrate in imidazolium ILs. The scope of this condensation reaction was investigated with a variety of propargylicalcohols and a host of acyclic