Morita-Baylis-Hillman adducts undergo smooth allylic nucleophilic substitution (SN2′) with allyltrimethylsilane in the presence of BF 3 ·OEt 2 under mild reaction conditions to afford 1,5-diene derivatives in good yields with high selectivity.
Acetates of Baylis-Hillman adducts derived from ethyl acrylate, methyl vinyl ketone, and acrylonitrile were coupled with allyltributylstannane using Pd(PPh3)4 or Pd(dba)2 as the catalyst at room temperature to afford the corresponding trisubstituted alka-1,5-dienes in good to high yields.