The process is performed according to the method described in Example 2 (step 2.7.). Starting with 0.50 g (1.36 mmol) of ethyl[7-(5-bromopyridin-2-yl)-7-azaspiro[3.5]non-2-yl]carbamate, prepared in the preceding step, 0.33 mL (1.63 mmol) of pinacol 2-methyl-1-propenylboronate (commercial) and 1.33 g (4.07 mmol) of caesium carbonate, suspended in 9 mL of a 9/1 mixture of tetrahydrofuran and water, and 0.11 g (0.14 mmol) of PdCl2dppf.CH2Cl2, and after purifying on a column of silica gel, eluting with a 100/0/0 to 99/1/0.1 mixture of dichloromethane, methanol and 28% aqueous ammonia, 0.39 g of expected product is obtained in the form of a wax.
