反应详情

温度

40 °C

To a solution of phenyl glycine ethyl ester (4.94 g, 27.6 mmol) and K2CO3 (11.42 g, 82.7 mmol) in anhydrous DMF (300 mL) under argon was added 5-bromo-3-(bromomethyl)pyridin-2-amine hydrobromide (9.52 g, 27.6 mmol). The mixture was stirred for 12 h at 40° C. Water (500 mL) was added and the mixture was extracted with ethyl acetate (3×500 mL). Combined organic layers were washed with water (2×400 mL) and brine (400 mL), dried over MgSO4, filtered and concentrated to a brown oil. Purification by column chromatography (silica gel, gradient elution of 30% ethyl acetate/hexanes to 80% ethyl acetate/hexanes) gave ethyl 2-(((2-amino-5-bromopyridin-3-yl)methyl)(phenyl)amino)acetate (3.41 g, 34%) as a yellow solid: 1H NMR (300 MHz, DMSO-d6) δ 7.89-7.88 (m, 1H), 7.36-7.35 (m, 1H), 7.17-7.11 (m, 2H), 6.68-6.64 (m, 1H), 6.47-6.44 (m, 2H), 6.09 (s, 2H), 4.30-4.29 (m, 4H), 4.12 (q, J=6.9 Hz, 2H), 1.19 (t, J=6.9 Hz, 3H).

1. extractionthe mixture was extracted with ethyl acetate (3×500 mL)
2. washCombined organic layers were washed with water (2×400 mL) and brine (400 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated to a brown oil
6. customPurification
7. washby column chromatography (silica gel, gradient elution of 30% ethyl acetate/hexanes to 80% ethyl acetate/hexanes)