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A solution of ethyl N-phenylalaninate (9.65 g, 50 mmol) and 2,4-dichloro-5-nitropyrimidine (9.7 g, 50 mmol) in anhydrous dichloromethane (100 mL) was stirred for 5 minutes at rt under nitrogen. The solution was then cooled to 0° C. (Ice bath) followed by addition of imidazole (3.41 g, 50 mmol). The resulting reaction mixture was allowed to warm up to rt in 30 min and further heated at 50° C. for 2 h. The reaction was then cooled to rt, washed with water, dried over sodium sulfate and evaporated to give a crude residue, which was purified by silica gel flash chromatography (eluent: ethyl acetate-hexane mixture (5:95)) to afford desired product (22%). 1HNMR (300 MHz, CDCl3): δ 1.29 (t, J=7.2 Hz, 3H), 1.63 (d, J=7.5 Hz, 3H), 4.18-4.27 (m, 2H), 4.90 (q, J=7.2 Hz, 1H), 7.19 (d, J=6.9 Hz, 2H), 7.26-7.39 (m, 3H) and 8.52 (s, 1H).

1. customThe resulting reaction mixture
2. temperatureto warm up to rt in 30 min
3. temperaturefurther heated at 50° C. for 2 h
4. temperatureThe reaction was then cooled to rt
5. washwashed with water
6. dry with materialdried over sodium sulfate
7. customevaporated
8. customto give a crude residue, which
9. customwas purified by silica gel flash chromatography (eluent: ethyl acetate-hexane mixture (5:95))