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

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Pd(PPh3)2Cl2 (10 mg) in a 10 mL CEM test tube under Ar was treated sequentially with 2′-amino-6-bromo-1′-methyl-2-phenylspiro[chroman-4,4′-imidazol]-5′(1′H)-one (20 mg, 0.05 mmol) in 1,4-dioxane (1 mL), Cs2CO3 (2 N, 0.3 mL) and 3-(2-cyanoethyl-carbamoyl)phenylboronic acid (22 mg, 0.1 mmol). The mixture was heated in a microwave reactor at 120° C. for 30 mins. The reaction mixture was concentrated in vacuo to give the residue, which was purified by preparative TLC to give pure 3-(2′-amino-1′-methyl-5′-oxo-2-phenyl-1′,5′-dihydrospiro[chroman-4,4′-imidazole]-6-yl)-N-(2-cyanoethyl)benzamide (1.96 mg, 8%). 1H-NMR (MeOD): 2.52 (m, 1 H), 2.64 (m, 1H), 2.83 (t, 2H), 3.35 (s, 3H), 3.68 (t, 2H), 5.86 (d, 1H), 7.18 (d, 1H), 7.43 (m, 3H), 7.55 (m, 3H), 7.57 (d, 1H), 7.71 (d, 1H), 7.79 (m, 2H), 8.05 (s, 1H).

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