Facile chemoselective carbonyl allylation of chalcones with allyltributylstannane catalyzed by CuI

Chemoselective allylation of carbonyl functionality of chalcones with allyltributylstannane was accomplished in the presence of CuI as catalyst. This reaction works well in DMF at 70 °C with exclusive formation of 1,2-addition product. Interesting feature of this reaction is that no conjugate addition product was produced. Various types of chalcones undergo carbonyl allylation in excellent yield.