Hydrogen Peroxide → (R)-5-((1-amino-1-oxobutan-2-yl)amino)-3-(pyrazolo[1,5-a]pyridin-3-ylamino)pyrazine-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

The mixture of (R)-2-((6-chloro-5-cyanopyrazin-2-yl)amino)butanamide (65 mg, 0.27 mmol), pyrazolo[1,5-a]pyridin-3-amine dihydrochloride (56 mg, 0.27 mmol), powder cesium carbonate (360 mg, 1.08 mmol), BINAP (31 mg, 0.05 mmol), Pd(OAc)2 (11 mg, 0.05 mmol) in 15 mL dioxane was degassed with argon stream. It was stirred in argon atmosphere at 115° C. for 16 h. The mixture was cooled, diluted with 100 mL EtOAc, vigorously stirred, and filtered through celite. The filtrate was concentrated and subjected to silica flash column with 0-8% MeOH in DCM to isolate the coupling product. It was dissolved in 8 mL MeOH and 2 mL DMSO. To the solution were added KOH (100 mg) and then 1 mL of H2O2 (50%). The mixture was stirred at RT for 30 m, quenched with acetonitrile and then TFA, concentrated in vacuo and subjected to reverse phase preparative HPLC to isolate the title compound (9 mg). MS found for C16H18N8O2 as (M+H)+ 355.4. UV: λ=297 nm. 1H NMR: (CD3OD) δ 8.33 (2H, m), 7.46 (1H, d, J=9.2 Hz), 7.32 (1H, s), 7.09 (1H, dd, J=8.8; 6.8 Hz), 6.78 (1H, t, J=7.2 Hz), 4.18 (1H, m), 1.83 (1H, m), 1.68 (1H, m), 0.92 (3H, t, J=7.2 Hz) ppm.

Provenance & Evidence