反应详情

To a solution of 2,4-dichloro-8-phenyl-7,8-dihydro-5H-pyrano[4,3-d]pyrimidine (Preparation I) (194 mg, 0.690 mmol) in MeOH (6901 μL) was added methanamine hydrochloride (69.9 mg, 1.035 mmol) and N,N-Diisopropylethylamine (301 μL, 1.725 mmol). The resulting mixture was stirred at RT for 2 h. The reaction mixture was then concentrated in vacuo. Purification by flash chromatography (Silica, EtOAc/Hexanes) gave 2-chloro-N-methyl-8-phenyl-7,8-dihydro-5H-pyrano[4,3-d]pyrimidin-4-amine (126 mg, 0.457 mmol, 66.2% yield). LC-MS (M+H)+=276.0. 1H NMR (500 MHz, CDCl3) δ ppm 7.28 (2H, t, J=7.32 Hz), 7.20-7.25 (1H, m), 7.14-7.20 (2H, m), 4.47-4.62 (2H, m), 4.47 (1H, s), 4.00-4.11 (2H, m), 3.95 (1H, d, J=3.36 Hz), 3.08 (3H, d, J=4.88 Hz).

1. concentrationThe reaction mixture was then concentrated in vacuo
2. customPurification by flash chromatography (Silica, EtOAc/Hexanes)