反应详情

Tert-butyl 4-(5-(3,4-dimethoxyphenyl)-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-2-yl)-2-methyl-5,6-dihydropyridine-1 (2H)— carboxylate (Mixture with regioisomer tert-butyl 4-(5-(3,4-dimethoxyphenyl)-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-2-yl)-6-methyl-5,6-dihydropyridine-1(2H)-carboxylate, total is 60 mg, 0.116 mmol) was dissolved in Methanol (2.5 ml). The solution was treated with Hydrogen for 2.5 hrs at room temperature using H-Cube (Full H2, 1 mL/min, small size (30 mm) 10% Palladium on Carbon CatCart). 1 mL Toluene was added. Solvent was concentrated. The crude product was purified on silica-gel (Column Interchim 25 g, 30 μM) eluting with 12-100% EtOAc/Heptane to afford tert-butyl 4-(5-(3,4-dimethoxyphenyl)-7-(trifluoromethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidin-2-yl)-2-methylpiperidine-1-carboxylate (36 mg, 0.069 mmol, 59% yield) as a white solid.

1. concentrationSolvent was concentrated
2. customThe crude product was purified on silica-gel (Column Interchim 25 g, 30 μM)
3. washeluting with 12-100% EtOAc/Heptane