According to Scheme 15 Method D: 2-(4-(1-(4-Chlorobenzyl)-1,6-dihydro-6-oxopyridin-3-yl)phenyl)acetonitrile (1 eq, 0.24 mmol, 0.08 g) was heated at 110° C. under nitrogen overnight with dibutyltin oxide (0.22 eq, 0.05 mmol, 0.01 g) and azidotrimethylsilane (6.0 eq, 1.43 mmol, 0.19 mL) in toluene (4 mL). The suspension was filtered and the filtrate concentrated under vacuo. The crude product was purified by chromatography on silica gel using MeOH/AcOEt 20/80 as eluent and recrystallised in diisopropyl ether to afford the title compound as a white solid (0.09 mmol, 35 mg, 39%).
