Triethylamine → 8-(1-(4-Methoxyphenyl)-5-(p-tolyl)-1H-pyrazol-3-yl)-1,4-dioxaspiro[4.5]decan-8-ol

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Reaction Steps

To a solution of 4-methoxyphenylhydrazine hydrochloride (7.35 g, 42.1 mmol) in ethanol (76.6 mL), triethylamine (5.87 mL, 42.1 mmol) was added dropwise, and the obtained solution was stirred at room temperature for 30 minutes. To the reaction solution, a solution of 3-(8-hydroxy-1,4-dioxaspiro[4.5]decan-8-yl)-1-(p-tolyl)-2-propyn-1-one (Reference Example 15) (11.5 g, 38.3 mmol) in ethanol (76.6 mL) was added dropwise, and the obtained solution was stirred at room temperature for 15 hours. Thereafter, the reaction solution was concentrated under reduced pressure. Water was added to the residue and the resultant was extracted with ethyl acetate. The organic layer was washed with 1 M hydrochloric acid, distilled water and brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate) to obtain the captioned compound (14.7 g, 35.0 mmol, 91%) as an amorphous product.

Provenance & Evidence