t-butyl piperazine-1-carboxylate (compound 31, 8.6 g, 46 mmol) and quinolin-8-yl trifluoromethanesulfonate (compound 30, 11 g, 39.6 mmol) were added to a solution of Cs2CO3 (18 g, 55 mmol), BINAP (1.07 g) and Pd(OAc)2 (367 mg) in THF (100 ml). The reaction mixture was refluxed for 1 day and then cooled down to room temperature. The resulting solution was diluted with Et2O (100 ml) and then filtered with Celite. The organic solution was evaporated under reduced pressure, the residue was purified with normal preparative column to give rise to desired compound (9.3 g, 74% yield) as a light yellow solid.
