DPPF (8.1 mg, 0.015 mmol) and Pd2dba3 (3.35 mg, 0.00365 mmol) were suspended in dimethylformamide (0.4 mL) and after stirring at room temperature under an inert atmosphere of nitrogen for 20 min 7-[(tert-butoxycarbonyl)amino]-8-(4-chlorobenzyl)-5,6,7,8-tetrahydronaphthalen-2-yl trifluoromethanesulfonate (38 mg, 0.073 mmol) and zinc cyanide (12.87 mg, 0.110 mmol) were added. The reaction mixture was stirred at 90° C. for 1 h. The solvent was evaporated in vacuo. Water (10 mL) was added to the crude product and the aqueous layer was extracted with ethyl acetate (two times with 10 mL). The combined organic extracts were dried (Na2SO4) and concentrated in vacuo. The crude product was purified by flash chromatography (dichloromethane, silica gel). Yield: 16 mg (0.040 mmol, 55%).
