p-Toluenesulfonic acid monohydrate → 2-[5-(2,2-Dimethylpropoxy)pyridin-2-yl]-4-(1H-imidazol-1-yl)-1,2-dihydro-3H-pyrazol-3-one

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Reaction Steps

233 mg (1.0 mmol, purity 90%) of the compound from Example 42A are initially introduced into 4 ml ethanol. 260 mg (1.0 mmol, purity 75%) of the compound from Example 12A and 38 mg (0.2 mmol) p-toluenesulfonic acid monohydrate are added and the mixture is stirred under reflux for 16 h. The mixture is then allowed to cool to RT, the solid which has precipitated out is filtered off and washed with a little ethanol and the solid is dried under a high vacuum. A further amount of the target compound is obtained by purifying the mother liquor of the filtration via preparative HPLC (RP18 column; mobile phase: acetonitrile/water gradient with addition of 0.1% TFA).

Provenance & Evidence