反应详情

A mixture of 4,6-dichloropyrido[3,2-d]pyrimidine (Intermediate 1, step D) (0.100 g, 0.500 mmol), cyclopentanamine (0.054 ml, 0.550 mmol), PdCl2(dppf)-CH2Cl2Adduct (4.08 mg, 5.00 mmol) and sodium tert-butoxide (0.096 g, 1.00 mmol) in dioxane (2.50 ml) was refluxed for 3 hours. After cooling to room temperature, the reaction mixture was filtered through a Celite pad and washed with CH2Cl2. The filtrate was concentrated in vacuo. The residue was purified by column chromatography on SiO2 (Hex:EtOAc=1:1) to give 6-chloro-N-cyclopentylpyrido[3,2-d]pyrimidin-4-amine (0.043 g, 35%) as a yellow oil. 1H-NMR (CDCl3, Varian 400 MHz)): δ 1.60-1.83 (6H, m), 2.15-2.21 (2H, m), 4.55-4.60 (1H, m), 6.96 (1H, d, J=6.4 Hz), 7.59-7.62 (1H, m), 8.02-8.04 (1H, m), 8.63 (1H, s).

1. temperaturewas refluxed for 3 hours
2. filtrationthe reaction mixture was filtered through a Celite pad
3. washwashed with CH2Cl2
4. concentrationThe filtrate was concentrated in vacuo
5. customThe residue was purified by column chromatography on SiO2 (Hex:EtOAc=1:1)