Conjugate addition of vinylic organocuprates generated via transmetalation of phenylseleno-substituted vinylzirconates: Functionalization at the 4-position of enones
propargylic selenides (1) or 4-phenylseleno-1-butyne (2) with Cp2ZrHCl, followed by in situtransmetalation to cuprate (Me2Cu(CN)Li2) and addition of enones, led to the formation of 1,4-adducts in good yields. The adducts derived from 1 were subjected to oxidation with H2O2 to afford allylic alcohol derivatives via [2,3] sigmatropic rearrangement of allylic selenides. On the other hand, the oxidation