7-[3-(Trifluoromethyl)phenyl]pyrazolo[1,5-a]pyrimidine-3-carboxamide → 4,5-Dihydro-7-(3-methylphenyl)pyrazolo[1,5-a]pyrimidine-3-carboxamide

Beteiligte Stoffe

Reaktionsschritte

7-[3-Methylphenyl)pyrazolo[1,5-a]pyrimidine-3-carboxamine (prepared as described in Example 1) is stirred as a suspension in gacial acetic acid (cooled in an ice bath) under nitrogen and then excess sodium cyanoborohydide is added to the reaction mixture in portions. After one hour of stirring in the ice bath, the mixture is stirred at room temperature for 19 hours. This solution is evaporated to dryness, then water is added and the white precipitate which forms is collected by filtration and washed with an aqueous saturated solution of sodium bicarbonate, and finally with water. The solid is collected by filteration and dried to give 4,5-dihydro-7-(3-methylphenyl)pyrazolo[1,5-a]pyrimidine-3-carboxamide.

Herkunft & Nachweise