反应详情

A solution of 1.21 g (3.9 mmol) of 2-(4-benzyloxy-phenyl)-3-dimethylamino-acrylic acid methyl ester and 0.422 g (3.9 mmol) of 5-amino-1H-pyrazole-4-carbonitrile in 5 mL of acetic acid (HOAc) was heated at reflux overnight, during which time a precipitate formed. The reaction mixture was cooled to rt, diluted with 20% ethyl acetate in hexane solution, and filtered to give 0.86 g (65% over 2 steps) of 6-(4-benzyloxy-phenyl)-7-oxo-4,7-dihydro-pyrazolo[1,5-a]pyrimidine-3-carbonitrile as a tan colored solid as indicated by 1H NMR; LC-MS—calcd for C20H14N4O2 [M++H]+: 343.11, found: 343.1.

1. temperatureat reflux overnight, during which time a precipitate
2. customformed
3. filtrationfiltered