DMF (30 mL) is added to 4-(5-iodo-imidazol-1-yl)-3,3-dimethyl-isochroman-1-one (1.62 g, 4.18 mmol) (Example 2b), tributylvinyltin (2.40 g, 8.36 mmol), Pd2 dba3.CHCl3 (0.087 g, 0.084 mmol) and triphenylphosphine (0.089 g, 0.334 mmol) under nitrogen. The mixture is heated to 90° C., to give a clear tan solution. After 3 h, the mixture is cooled down, diluted with isopropyl acetate and washed twice with water and brine. The combined organic phase is dried over magnesium sulfate and filtered through a cotton plug. The residue is purified by silica gel flash chromatography (10% wt silica gel/KF, elution with dichloromethane-methanol, 49:1 to 24:1) to give 4-(5-vinyl-imidazol-1-yl)-3,3-dimethyl-isochroman-1-one as a yellow solid; MS (ESI) m/z 269.2 (M+H); 1H NMR (400 MHz, MeOD) δ ppm 1.20 (s, 3 H), 1.51 (s, 3 H), 5.42 (br. s, 1 H), 5.69 (s, 1 H), 5.81 (br. s, 1 H), 6.95 (br. s, 1 H), 7.14 (br. s, 1H), 7.21 (s, 1 H), 7.42 (d, J=7.6 Hz, 1 H), 7.58-7.69 (m, 1 H), 7.70-7.80 (m, 1 H), 8.21 (dd, J=7.8, 1.3 Hz, 1 H).
