1: 3,4-dihydroxy-benzoic acid With caesium carbonate in methanol; water T=20°C; 0.5 h; Inert atmosphere; 2: benzyl bromide in N,N-dimethyl-formamide T=0 - 20°C; 11 h; Inert atmosphere;

toluene-4-sulfonic acid; benzyl alcohol; silica gel in ethyl acetate; benzene

1,1'-carbonyldiimidazole in acetonitrile T=65°C; 3 h;