Pd(PPh3)2Cl2 (10 mg) in a 10 mL of tube under Ar2 was treated sequentially with 2′-amino-6-bromo-2-phenyl-1′-(2,2,2-trifluoroethyl)spiro[chroman-4,4′-imidazol]-5′(1′H)-one (20 mg, 0.044 mmol) in 1,4-dioxane (1 mL), Cs2CO3 (2 M, 0.3 mL) and 3-cyanophenylboronic acid (13 mg, 0.088 mmol). The mixture was heated at 120° C. under microwave reactor for 0.5 h. The reaction mixture was concentrated in vacuo to give the residue, which was purified by preparative TLC to give pure 3-(2′-amino-5′-oxo-2-phenyl-1′-(2,2,2-trifluoroethyl)-1′,5′-dihydrospiro[chroman-4,4′-imidazole]-6-yl)benzonitrile (3.7 mg, 12%). 1H-NMR (MeOD): 2.27 (m, 1H), 2.35 (m, 1H), 3.87 (m, 2H), 5.83 (m, 1H), 7.01 (d, 1H), 7.26(m, 1H), 7.32 (m, 5H), 7.59 (m, 3H), 7.76 (m, 1H), 7.81 (m, 1H).
