Contrasteric regioselectivity of palladium(O) catalyzed couplings of alkynes with a bis(enoltriflate). Novel syntheses of E-configurated dienediynes
作者:Jean Suffert、Anke Eggers、Stefan W. Scheuplein、Reinhard Brückner
DOI:10.1016/s0040-4039(00)60521-x
日期:1993.6
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 dienediynes E-3a'-l' and E-3a-l in 48-91 % yield. Selective syntheses of such dienediynes were achieved by Pd mediated couplings of enolnonaflate E-6 with an alkyne followed by addition of a lithium acetylide and by dehydration.