Cesium carbonate (0.143 g, 0.438 mmol), palladium tetrakis (0.051 g, 0.042 mmol) and 2-[(E)-2-(3-Chloro-phenyl)-vinyl]-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (0.116 g, 0.440 mmol) were added to a solution of 2-(2-Iodo-pyrimidin-4-yl)-1-methyl-4-oxo-1,4,6,7-tetrahydro-pyrrolo[3,2-c]pyridine-5-carboxylic acid tert-butyl ester (synthesised as reported in Example 9) (0.100 g, 0.22 mmol) in dioxane (5.0 ml) under argon atmosphere. Argon was bubbled for 5 minutes, the vial was closed and the reaction mixture was heated by microwave irradiation for 30 minute at 100° C. for two cycles. In order to affect completion, a refresh of the catalyst and the base and two more cycles at the microwaves were carried on. The solvent was removed under vacuum, the residue was taken into DCM (5.0 ml), which was washed with a saturated solution of NaHCO3 (1×5.0 ml), brine (1×5.0 ml), and it was dried over Na2SO4. The filtrate was evaporated to dryness to give the crude product, which was purified by flash chromatography, over silica gel, using DCM/MeOH (9.9:0.1) as eluent, to afford 2-{2-[(E)-2-(3-Chloro-phenyl)-vinyl]-pyrimidin-4-yl}-1-methyl-4-oxo-1,4,6,7-tetrahydro-pyrrolo[3,2-c]pyridine-5-carboxylic acid tert-butyl ester yellow solid (0.051 g, 0.110 mmol, 50%).
