A Convenient Synthesis of Chrysin and Tectochrysin

Chrysin(1) and tectochrysin(2) were respectively synthesized in four steps from 1,3,5-tri-bromobenzene in an overall yield of 46.8% and that of 37.0% with the key step being theBu4NBr catalyzed hydrolysis of 1-phenyl-3- ( 2 ', 4 ' ,6 ' -trimethoxyphenyl )-1,3-propanedione (11) under different conditions.