Trifluoroacetic acid → HCID 86662057, compound

Participants

Reaction Steps

To a mixture of 5-chloro-6-(2-hydroxypropan-2-yl)-3-{[3-methoxy-4-(4-methylpiperazin-1-yl)phenyl]amino}pyrazine-2-carboxamide (Preparation Example 544) (300 mg) and trifluoroacetic acid (3 mL), triethylsilane (0.55 mL) was added under ice cooling and stirred under ice cooling for 10 minutes and at room temperature for 22 hours. After the reaction liquid was concentrated, the residue was diluted with chloroform and washed with saturated aqueous sodium hydrogen carbonate. After drying over anhydrous magnesium sulfate, the solvent was distilled off, and the residue was purified by silica gel column chromatography (eluent; chloroform:methanol:saturated aqueous ammonia=100:0:0 to 20:1:0.1) to give a crude product. The crude product was washed with diisopropyl ether to give 5-chloro-6-isopropyl-3-{[3-methoxy-4-(4-methylpiperazin-1-yl)phenyl]amino}pyrazine-2-carboxamide (219 mg) as an orange solid.

Provenance & Evidence