1: 40 percent / cesium carbonate / dimethylformamide / 16 h / 80 °C 2: zinc, TiCl4 / tetrahydrofuran / 5 h / Heating View Scheme

titanium tetrachloride; zinc in tetrahydrofuran 5 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;