反应详情

5-Chloro-N-[5-[2-(3,5-dimethoxyphenyl)ethyl]-2H-pyrazol-3-yl]pyrazine-2-carboxamide (388 mg, 1.00 mmol) was added in one portion to 1,2-dimethyl-piperazine (228 mg, 2.00 mmol) in anhydrous dimethylsulfoxide (2.00 ml) at 25° C. The resulting solution was stirred at ambient temperature for 2 h. The residue was purified by ion exchange chromatography, using an SCX column. The desired product was eluted from the column using 7M NH3/MeOH to afford impure material. The concentrated eluent was purified by silica column chromatography, eluting with a gradient of 0 to 10% 7M NH3/MeOH in DCM. Pure fractions were evaporated to dryness to afford the title compound (375 mg, 81%) as a yellow solid.

1. customThe residue was purified by ion exchange chromatography
2. washThe desired product was eluted from the column
3. customto afford impure material
4. customThe concentrated eluent was purified by silica column chromatography
5. washeluting with a gradient of 0 to 10% 7M NH3/MeOH in DCM
6. customPure fractions were evaporated to dryness