To a solution of [bis-(4-methoxy-phenyl)-phenyl-methyl]-[(2R,5R)-5-(6-bromo-3-fluoro-pyridin-2-yl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-amine (250 mg, 0.372 mmol) in toluene (3.72 ml) was added 2-amino-3-pyridinecarbonitrile (221 mg, 1.859 mmol), Pd2(dba)3 (6.81 mg, 7.43 μmol), BINAP (9.26 mg, 0.015 mmol) and sodium tert-butoxide (50 mg, 0.520 mmol). The reaction mixture was degassed for 5 min and the microwave vial was sealed and stirred at 100° C. for 9 h. The reaction mixture was diluted with DCM and washed with water. The organic layer was dried with Na2SO4. The residue was purified by chromatography (silica gel; eluent DCM/MeOH+NH4OH) to afford the title compound.
