tetrabutylammomium bromide; sodium acetate; palladium diacetate; triphenylphosphine in N,N-dimethyl-formamide T=120°C; Heck reaction; 8 h; in air;

(i) HC(OEt)3, H3PO4, (ii) /BRN= 605351/, ZnCl2, AcOEt, (iii) aq. NaOAc, AcOH; Multistep reaction;