反应详情

Sodium hydride (60% dispersion in oil; 180 mg) was added to a mixture of 2-ethyl-5,6,7,8-tetrahydro-4(1H)-quinolone (660 mg) and 4-bromomethylphenylboronic acid (800 mg) (obtained as described in J. Amer. Chem. Soc. 1958, 80, 835) in DMF (12 ml) under an atmosphere of argon. The mixture was stirred for 40 hours and then water (0.2 ml) was added. Volatile material was removed by evaporation and the residue was dissolved in warm 0.5M sodium hydroxide solution (10 ml). Insoluble material was removed by filtration and the filtrate was acidified to pH 4 with 20% citric acid solution. The precipitate solid was collected by filtration, washed with water (20 ml) and dried under high vacuum to give 4-[(2-ethyl-5,6,7,8-tetrahydroquinolin-4-yl)oxymethyl]phenylboronic acid (C) (1.15 g), m.p. 229°-231° C.; NMR (d6 -DMSO): 1.3(t,3H), 1.6-1.9(m,4H), 2.5-2.7(m,2H), 2.75-2.95(m,4H), 5.4(s,2H), 7.3(d,2H), 7.4(s,1H, 7.5(d,2H).

1. customVolatile material was removed by evaporation
2. dissolutionthe residue was dissolved in warm 0.5M sodium hydroxide solution (10 ml)
3. customInsoluble material was removed by filtration
4. filtrationThe precipitate solid was collected by filtration
5. washwashed with water (20 ml)
6. customdried under high vacuum