反应详情

Pd(PPh3)4 (40 mg, 0.10 mmol) in a 10 mL flask under Ar was treated sequentially with 2′-amino-6-bromo-1′-ethyl-2-phenylspiro[chroman-4,4′-imidazol]-5′(1′H)-one (42 mg, 0.10 mmol) in toluene (5 mL), Na2CO3 (2 N, 2 mL), and 4-cyanophenylboronic acid (31 mg, 0.21 mmol). The mixture refluxed under Ar overnight. The reaction mixture was concentrated in vacuo to give a residue, which was purified by preparative TLC followed by preparative HPLC to give pure 3-(2′-amino-1′-ethyl-5′-oxo-2-phenyl-1′,5′-dihydrospiro[chroman-4,4′-imidazole]-6-yl)benzonitrile (1.76 mg, 3%). 1H-NMR (MeOD): 1.31 (m, 3H), 2.55 (m, 2H), 3.84 (m, 2H), 5.26 (m, 1H), 5.86 (m, 1H), 7.14 (m, 1H), 7.47 (m, 6H), 7.59 (m, 1H), 7.28 (m, 2H), 7.90 (m, 2H).

1. temperatureThe mixture refluxed under Ar overnight
2. concentrationThe reaction mixture was concentrated in vacuo
3. customto give a residue, which
4. customwas purified by preparative TLC