反应详情

温度

50 °C

To a mixture of tert-butyl 2,6-dichloropyrimidine-4-carboxylate (0.310 g, 1.24 mmol) in acetonitrile (5 mL) was added (S)-methyl 2-aminopropanoate hydrochloride (0.177 g, 1.27 mmol) and iPr2NEt (0.48 mL, 2.8 mmol). The mixture was heated at 50° C. overnight then concentrated in vacuo. The residue was chromatographed over silica gel with 10-50% EtOAc in hexanes. The product fractions were evaporated in vacuo to yield (S)-tert-butyl 2-chloro-6-((1-methoxy-1-oxopropan-2-yl)amino)pyrimidine-4-carboxylate as a colorless glass (0.347 g, 1.10 mmol, 89% yield). 1H NMR (400 MHz, DMSO-d6): 8.70 (1H, d, J=6.8 Hz), 7.12 (1H, s), 4.56-4.47 (1H, m), 3.65 (3H, s), 1.53 (9H, s), 1.39 (3H, d, J=7.2 Hz). LC/MS: m/z=316.2 [M+H]+.

1. concentrationthen concentrated in vacuo
2. customThe residue was chromatographed over silica gel with 10-50% EtOAc in hexanes
3. customThe product fractions were evaporated in vacuo