palladium diacetate; sodium acetate; triphenylphosphine in N,N-dimethyl-formamide T=100°C; 12 h;

tetrabutyl-ammonium chloride; sodium acetate; triphenylphosphine; palladium diacetate in N,N-dimethyl-formamide T=100°C; Condensation; rearrangement; 12 h; Title compound not separated from byproducts.;

(i), (ii) aq. H2SO4; Multistep reaction;