反应详情

A mixture of 1.0 g (2.7 mmol) of 3-(4-benzyloxy-phenyl)-2-cyclohexyl-3-oxo-propionic acid methyl ester, 340 mg (2.7 mmol) of 5-amino-1H-pyrazole-3-carboxylic acid amide, 51 mg (10 mol %) of p-toluenesulfonic acid monohydrate (PTSA), and 15 mL of toluene was heated at reflux for 72 h. The reaction mixture was then concentrated to a residue which chromatographed on silica gel (Biotage; gradient elution 15% ethyl acetate in dichloromethane to 6% methanol in dichloromethane) to give a residue which was further purified via reverse-phase chromatography (Gilson) to afford (after lyophilization) 22 mg (2% yield) of desired 5-(4-benzyloxy-phenyl)-6-cyclohexyl-7-oxo-4,7-dihydro-pyrazolo[1,5-a]pyrimidine-2-carboxylic acid amide as indicated by 1H-NMR; LC-MS calcd for C26H26N4O3 [M++H]+: 443.2, found: 443.2.

1. temperaturewas heated
2. temperatureat reflux for 72 h
3. concentrationThe reaction mixture was then concentrated to a residue which
4. customchromatographed on silica gel (Biotage; gradient elution 15% ethyl acetate in dichloromethane to 6% methanol in dichloromethane)
5. customto give a residue which
6. customwas further purified via reverse-phase chromatography (Gilson)