Water → Methyl 2-(2-methylpyrazolo[1,5-a]pyridin-3-yl)-4-(prop-2-en-1-yloxy)-1,3-thiazole-5-carboxylate

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Reaction Steps

Methyl 4-hydroxy-2-(2-methylpyrazolo[1,5-a]pyridin-3-yl)-1,3-thiazole-5-carboxylate (1.0 g, 3.5 mmol) produced in Example 13-B(i) was dissolved in N,N-dimethylformamide (50 mL), potassium carbonate (3.2 g, 9.7 mmol) and 3-bromoprop-1-ene (2.8 g, 23 mmol) were added, and the mixture was stirred at room temperature for 2 hr. Water (100 mL) and ethyl acetate (100 mL) were added to the reaction solution, and the mixture was stirred for 30 min. The organic layer was washed with water (100 mL×3) and saturated brine (10 mL) and dried over anhydrous sodium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0→0/100) to give the title compound (760 mg, 67%) as a brown solid.

Provenance & Evidence