反应详情

2-Chloro-4-anilinopyrimidine (Reference Example A-9, 700 mg, 3.4 mmol) was dissolved in DCM (70 ml), triphenyl phosphine (1.07 g, 4.1 mmol) and 2-cyclohexyl ethanol (0.57 ml, 4.1 mmol) were added followed by dropwise addition of DEAD (0.646 ml, 4.1 mmol). After 1 hour additional triphenyl phosphine (0.5 g, 2 mmol), 2-cyclohexyl ethanol (0.28 ml, 2 mmol) and DEAD (0.320 ml, 2 mmol) were added and the reaction mixture was stirred overnight at ambient temperature. The solvent was evaporated off and the residue was purified by flash chromatography using EtOAc/petroleum ether (15/85, then 20/80) as the eluent. The solvent was evaporated to give the title product as a colourless oil (368 mg, 37%). NMR (400 MHz, 353K): 0.90 (m, 2H), 1.20 (m, 3H), 1.30 (m, 1H), 1.65 (m, 7H), 3.90 (t, 2H), 4.05 (m, 1H), 6.10 (d, 1H), 7.34 (d, 2H), 7.43 (t, 1H), 7.54 (t, 2H), 7.95 (d, 1H); m/z (ES+) 316 and 318 (MH+).

1. customThe solvent was evaporated off
2. customthe residue was purified by flash chromatography
3. customThe solvent was evaporated