Constrasteric Regioselectivity of Palladium(0) Catalyzed Couplings of Alkynes with Bis(enoltriflate). Novel Syntheses of E-Configurated Dienediynes

Article abstract of DOI:10.1016/S0040-4039(00)60521-X

Two consecutive PdCl2(PPh3)2 catalyzed couplings of the bis(enoltriflate) E-2 with two different alkynes were performed as one-pot reactions; they provided 3:1-7:1 mixtures of enediynes E-3a'-l' and E-3a-l in 48-91 percent yield.Selective syntheses of suc