反应详情

温度

160 °C

Into a 500 milliliter four-necked round-bottom reaction flask equipped with a mechanical stirrer, Dean-Stark trap/condenser, thermometer and heating mantle was added 320 grams (2.0 mol) of diethyl malonate and 37.2 grams (0.2 mol) of 4-bromo-2-methylaniline. The resulting mixture was heated at a temperature of 160° C. for a period of four hours and then cooled to a temperature of about 0° C. to form a precipitate. After filtering on a fritted glass funnel, the wet-cake was washed with heptane and air dried to give 37.6 grams (0.125 mol) of ethyl 3-[(4-bromo-2-methylphenyl)amino]-3-oxopropanoate. Liquid chromatographic analysis indicated 97 percent purity by comparison with an authenic sample of pure material. NMR analysis of the product indicated the following: 'H NMR (CDCl3) δ9.52 (1H, bs), 8.02 (1H, d, J=9 Hz), 7.2-7.5 (2H, m), 4.30 (2H, q, J=7 Hz), 3.50 (2H, s), 2.30 (3H, s), 1.30 (3H, t, J=7 Hz).

1. customInto a 500 milliliter four-necked round-bottom reaction flask equipped with a mechanical stirrer
2. temperatureDean-Stark trap/condenser, thermometer and heating mantle
3. temperaturecooled to a temperature of about 0° C.
4. customto form a precipitate
5. filtrationAfter filtering on a fritted glass funnel
6. washthe wet-cake was washed with heptane and air
7. customdried