3-(N,N-Dimethylsulphonamido)benzeneboronic acid → 3-(2'-amino-1'-methyl-5'-oxo-2-phenyl-1',5'-dihydrospiro[chroman-4,4'-imidazole]-6-yl)-N,N-dimethylbenzenesulfonamide

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Pd(PPh3)2Cl2 (10 mg) in a 10 mL tube under Ar was treated sequentially with 2′-amino-6-bromo-1′-(cyclohexylmethyl)-2-phenylspiro[chroman-4,4′-imidazol]-5′(1′H)-one (20 mg, 0.052 mmol) in 1,4-dioxane (1 mL), Cs2CO3 (2 N, 0.3 mL) and 3-(N,N-dimethylsulfamoyl)phenylboronic acid (24 mg, 0.104 mmol). The mixture was heated at 120° C. in a microwave reactor for 0.5 h. The reaction mixture was concentrated in vacuo to give the residue, which was purified by preparative TLC followed by preparative HPLC to give pure 3-(2′-amino-1′-methyl-5′-oxo-2-phenyl-1′,5′-dihydrospiro[chroman-4,4′-imidazole]-6-yl)-N,N-dimethylbenzenesulfonamide (1.7 mg, 7%). 1H-NMR (MeOD): 2.47 (m, 1H), 2.62 (m, 1H), 2.71 (s, 6H), 3.29 (s, 3H), 5.28 (d, 0.3H), 5.89 (d, 0.7H), 7.19 (m, 1H), 7.47 (m, 6H), 7.69 (m, 2H), 7.75 (m, 1H), 7.93 (m, 2H).

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