Dimethyl acetylsuccinate → HCID 178499489, compound

Participants

Reaction Conditions

Reaction Steps

A 3-lit three neck flask was fitted with a mechanical stirrer and a heating mantle. A suspension of 3-(3-bromophenyl)-1H-pyrazol-5-amine (84.9 g, 357 mmol), dimethyl 2-acetylsuccinate (73.8 g, 392 mmol) and tosic acid monohydrate (1.357 g, 7.13 mmol) in o-xylene (1500 mL) was heated to refluxed (135° C. measured internal temp) for 3.5 h. The heating was turned off, the reaction was diluted with hexanes (1000 mL) and was allowed to cool slowly overnight. The solids were collected by filtration. The filter cake was washed with hexanes and dried under vacuum overnight to afford methyl 2-(2-(3-bromophenyl)-7-hydroxy-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)acetate (132.21 g, 334 mmol, 94% yield) as a white powdery solid. 1H NMR (500 MHz, DMSO-d6) δ: 12.47 (s, 1H), 8.18 (t, J=1.7 Hz, 1H), 8.02 (dt, J=7.1, 1.3 Hz, 1H), 7.65-7.60 (m, 1H), 7.45 (t, J=7.9 Hz, 1H), 6.69 (s, 1H), 3.63 (s, 3H), 3.58 (s, 2H), 2.34 (s, 3H). LCMS (M+H)=376.4.

Provenance & Evidence