HCID 22902333, compound → HCID 22902351, compound

Participants

Reaction Steps

4.9 g of 3-{3-[N-(2-(3,4-dimethoxyphenyl)-ethyl)-amino]-propyloxy}-2-benzyl-5-(3,4-dimethoxyphenyl)-pyrazole were dissolved in glacial acetic acid, 0.5 g of palladium on charcoal was added, and the reaction mixture was hydrogenated at 80 bar hydrogen pressure and at 80° C. for 24 hours. After removal of the catalyst by filtration, the reaction mixture was concentrated by evaporation and rendered alkaline (pH=10) with sodium hydroxide solution, and the product was extracted with ethyl acetate. The organic phase was separated, concentrated and purified by flash chromatography over silica gel. 1.1 g of 3-{3-[N-(2-(3,4-dimethoxyphenyl)-ethyl)-amino]-propyloxy}-5-(3,4-dimethoxyphenyl)-pyrazole were obtained. The IR spectrum of the base (as film) showed bands at 1511 cm-1, 1465 cm-1, 1262 cm-1.

Provenance & Evidence