Hydrochloric Acid → 1-((6-Methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidin-2-yl)methyl)-3-(trifluoromethyl)-1H-pyrazole-4-carbaldehyde

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Reaction Steps

3-(Trifluoromethyl)-1H-pyrazole-4-carbaldehyde (3.82 g, 23.3 mmol) and 2-(chloromethyl)-6-methylthieno[2,3-d]pyrimidin-4(3H)-one (5.00 g, 23.3 mmol) were suspended in THF:DMF (180 mL:20 mL) and potassium tert-butoxide (5.23 g, 46.6 mmol) added. The resulting mixture was stirred at RT for 18 h. The mixture was then diluted with EtOAc (500 mL) and shaken with water (200 mL). The separated aqueous phase was acidified to pH 5 with dilute HCl solution and reshaken with the organic layer. The separated organics were then washed with brine (2×200 mL) and dried over MgSO4 before concentration in vacuo. Purification by flash column chromatography-silica gel and elution with 50% isohexane:EtOAc, then EtOAc, gave the desired product as a pale yellow solid (4.65 g, 13.6 mmol, 58%).

Provenance & Evidence