Methyl 5-methoxy-3-oxopentanoate → HCID 178494792, compound

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Reaction Steps

A solution of 2.69 g (10 mmol) of) 4-benzenesulphonyl-5-methylsulphanyl-2H-pyrazol-3-ylamine and 1.6 g (10 mmol) of methyl 5-methoxy-3-oxo-valerate in 10 ml of acetic acid was heated at reflux for 4 hrs. The reaction solution was evaporated and the residue was partitioned between H2O and CH2Cl2. The aqueous phase was extracted three times with 80 ml of CH2Cl2. The combined organic phases were dried (MgSO4), filtered and evaporated. Chromatography (SiO2, CH2Cl2/MeOH 20:1) yielded 2.40 g (61%) of 3-benzenesulphonyl-5-(2-methoxy-ethyl)-2-methylsulphanyl-pyrazolo[1,5-a]pyrimidin-7-ol as a beige powder.

Provenance & Evidence