反应详情

To a flame dried flask under N2 was placed 2-chloro-5-hydroxynicotinonitrile (2.0 g, 0.012 mol), DMF (60 mL), NaH (50% oil dispersion, 0.75 g, 0.013 mol) and the mixture cooled to 0°-4° C. A solution of benzyl bromide (1.5 mL, 0.013 mol) in DMF (2 mL) was then added and the solution allowed to stir at room temperature overnight. The mixture was poured into H2O and extracted with Et2O (3X). The organic layer was concentrated to yield 2.0 g (100%) of 5-benzyloxy-2-chloronicotinonitrile. An analytical sample of 5-benzyloxy-3-chloronicotinonitrile was prepared by trituration with C6H14, mp 114°-15° C.; 1H NMR (CDCl3) δ 5.2 (2H, s) 7.4 (5H, s), 7.5 (1H, d, J=3) and 8.35 (1H, d, J=3); IR (nujol) 2220 cm-1 ; MS m/e M+ 244.

1. customTo a flame dried flask under N2
2. temperaturethe mixture cooled to 0°-4° C
3. extractionextracted with Et2O (3X)
4. concentrationThe organic layer was concentrated