反应详情

温度

0 °C

Diisobutylaluminium hydride (810.0 μL. of 1 M, 0.8100 mmol) in dichloromethane was added dropwise to a solution of methyl 3-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzoate (120 mg, 0.2700 mmol) in CH2Cl2 (6 mL) at 0° C., the solution darkened upon addition. The resulting solution was stirred at 0° C. for 30 min and allowed to warm slowly to room temperature. The reaction mixture was stirred at room temperature for 4 h and then quenched by addition of 1M HCl (3 mL). The resulting mixture was filtered through a Celite pad and washed with dichloromethane (2×5 mL). The layers were separated and the aqueous layer extracted further with dichloromethane (2×10 mL) and combined organic extracts dried over MgSO4 and concentrated in vacuo. The residue was purified using by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lypholised to give the product as a yellow solid (20.3 mg, 18% yield); 1H NMR (400 MHz, DMSO) d 2.98 (m, 6H), 4.66 (s, 2H), 7.55 (m, 2H), 7.63 (m, 2H), 7.80 (br s, 2H), 8.04 (m, 1H), 8.16 (m, 3H) and 8.99 (s, 1H) ppm; MS (ES+) 417.23

1. additionthe solution darkened upon addition
2. temperatureto warm slowly to room temperature
3. stirringThe reaction mixture was stirred at room temperature for 4 h
4. customquenched by addition of 1M HCl (3 mL)
5. filtrationThe resulting mixture was filtered through a Celite pad
6. washwashed with dichloromethane (2×5 mL)
7. customThe layers were separated
8. extractionthe aqueous layer extracted further with dichloromethane (2×10 mL)
9. dry with materialdried over MgSO4
10. concentrationconcentrated in vacuo
11. customThe residue was purified
12. customusing by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]