New Strong Base Synthesis of Symmetrical 1,5-Diaryl-1,3,5-pentanetriones from Acetone and Benzoate Esters
摘要:
Lithium hexamethyldisilazide (LiHMDS) was used to condense substituted benzoate esters with acetone to afford symmetrical 1,5-diaryl-1,3,5-pentanetriones that were isolated, characterized (including a representative X-ray crystallographic analysis), and acid cyclized to the respective 2,6-diaryl-4H-pyran-4-ones.
Synthesis of γ-pyrones via decarboxylative condensation of β-ketoacids
作者:Jérémy Merad、Thomas Maier、Catarina A. B. Rodrigues、Nuno Maulide
DOI:10.1007/s00706-016-1851-2
日期:2017.1
AbstractThis manuscript describes the convergent synthesis of aryl- and alkyl-disubstituted γ-pyrones from β-ketoacids. The reaction proceeds in the presence of trifluoromethanesulfonic anhydride via an unprecedented decarboxylative auto-condensation of the starting material. Herein, the scope and limitations of this transformation are reported. Graphical abstract