Under argon, a mixture of 137 mg (0.28 mmol) of the compound of Example 65, 4.04 mg (0.012 mmol) of palladium(II) trifluoroacetate, 9.91 mg (0.025 mmol) of racemic 2-di-tert-butylphosphino-1,1′-binaphthyl, 3.51 mg (0.054 mmol) of zinc flakes and 18.6 mg (0.16 mmol) of zinc cyanide in 1.5 ml N,N-dimethylacetamide was stirred at 95° C. for 20 hours. After cooling, the mixture was diluted with 80 ml of ethyl acetate and the mixture was washed in each case once with 10 ml of water and 10 ml saturated sodium chloride solution. The organic phase was dried over sodium sulphate and, after filtration, concentrated under reduced pressure. The residue obtained in this manner was purified by chromatography on a Biotage system (25 g Snap column; mobile phase gradient ethyl acetate/hexane, starting with 70% ethyl acetate, then increasing rapidly to 100% ethyl acetate). Further purification was by preparative thick-layer chromatography (2 mm layer thickness with concentration zone, mobile phase ethyl acetate, elution with methylene chloride/methanol 7:3). This gave 56 mg (38% of theory) of the title compound.
