反应详情

2,4-Dichloro-5-(trifluoromethyl)pyrimidine (411 mg, 1.89 mmol) was stirred in 1:1 t-BuOH:DCE (100 mL) at room temperature. A 1.0 M ZnCl2 solution in Et2O (2.16 mL, 2.16 mmol) was added cautiously and after addition the mixture was stirred at room temperature for 20 minutes. tert-Butyl 4-(5-aminopyridin-2-yl)piperidine-1-carboxylate I9 (500 mg, 1.80 mmol) was added followed by NEt3 (0.30 mL, 2.16 mmol) and the mixture was stirred at room temperature for 44 hours. The organic solvents were evaporated to dryness and the crude tan solid was suspended in water (250 mL) and sonicated for 10 minutes. The solid was isolated by filtration, washed with water (2×100 mL) and air-dried to give a cream solid. The solid was adsorbed onto silica and purified by silica gel column chromatography (40 g SiO2 cartridge, 0-100% EtOAc in petroleum benzine 40-60° C.) to give the title compound A70 as an off white solid (346 mg, 42%). LCMS-A: rt 5.949 min; m/z 458 [M+H]+.

1. customat room temperature
2. additionafter addition the mixture
3. addition(500 mg, 1.80 mmol) was added
4. stirringthe mixture was stirred at room temperature for 44 hours
5. customThe organic solvents were evaporated to dryness
6. customsonicated for 10 minutes
7. customThe solid was isolated by filtration
8. washwashed with water (2×100 mL)
9. customair-dried
10. customto give a cream solid
11. custompurified by silica gel column chromatography (40 g SiO2 cartridge, 0-100% EtOAc in petroleum benzine 40-60° C.)