Trimethylaluminum → 2-(4-cyclopropylpiperazin-1-yl)-N-[5-[2-(3,5-dimethoxyphenyl)ethyl]-2H-pyrazol-3-yl]pyrimidine-5-carboxamide

Participants

Reaction Steps

Trimethylaluminium (2M in toluene, 1.92 mL, 3.85 mmol) was added dropwise to a stirred suspension of 5-[2-(3,5-dimethoxyphenyl)ethyl]-2H-pyrazol-3-amine (381 mg, 1.54 mmol) and methyl 2-(4-cyclopropylpiperazin-1-yl)pyrimidine-5-carboxylate (404 mg, 1.54 mmol) in toluene (7.7 mL) at 25° C. The resulting solution was stirred at ambient temperature for 18 h and then heated at 60° C. for 2 h. The reaction mixture was quenched with methanol (20 mL) and treated with HCl (2N aqueous solution). The crude product was purified by ion exchange chromatography, using an SCX column. The desired product was eluted from the column using 7M NH3/MeOH and evaporated to dryness to afford impure product. The impure material was purified by preparative HPLC, using decreasingly polar mixtures of water (containing 0.1% NH3) and MeCN as eluents. Fractions containing the desired compound were evaporated to dryness to afford the title compound (100 mg, 14%) as a solid.

Provenance & Evidence