A convenient synthesis of new (E)-5-hydroxy-2-styrylchromones by modifications of the Baker–Venkataraman method
作者:Diana C. G. A. Pinto、Artur M. S. Silva、Jose´ A. S. Cavaleiro
DOI:10.1039/a908539d
日期:——
New
5-hydroxy-2-styrylchromones and 3-cinnamoyl-5-hydroxy-2-styrylchromones have been prepared by modifications
of the BakerâVenkataraman method. All compounds were fully characterized using several 1D and 2D NMR techniques.
The E stereochemistry of the double bonds of all the 5-hydroxy-2-styrylchromones and the conformational
features
of those substituted
in the 2â² and 2â³ positions
were unambiguously established by NOE experiments.