potassium carbonate in 1,4-dioxane 16 h; Reflux;

1: With tetrakis(triphenylphosphine) palladium(0) in 1,4-dioxane T=20°C; 0.25 h; Inert atmosphere; 2: With formic acid in 1,4-dioxane T=80°C; 3 h; Inert atmosphere;

1: 1-Ethenyl-3-(phenylmethoxy)benzene With (C5H3N)(MeC=N(C6H4-2,6-iPr2))2; ethylmagnesium bromide; iron(II) chloride in tetrahydrofuran; diethyl ether T=20°C; 2 h; Inert atmosphere; 2: carbon dioxide in tetrahydrofuran; diethyl ether 0.5 h; Inert atmosphere; regioselective reaction;