2,2,5,5-Tetramethyltetrahydro-3-ketofuran → HCID 66823358, compound

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Reaction Steps

To an ice-cold solution of dihydro-2,2,5,5-tetramethylfuran-3-one (8.40 g, 0.059 mol) in anhydrous 1,2-dimethoxyethane (75 ml) is added sodium methoxide (3.60 g, 0.066 mol) in one portion, and the mixture is stirred at this temperature for 30 minutes. A solution of 4′-chloro-4-cyclopropyl-2′-fluorobiphenyl-3-carbaldehyde (14.80 g, 0.054 mmol) is then added dropwise over 20 minutes, maintaining temperature below 10° C. The reaction mixture is stirred at this temperature for 1 hour, then allowed to warm to room temperature before diluting with diethyl ether and distilled water. The two phases are separated, and the aqueous phase is extracted again with diethyl ether (×2). Organic fractions are combined, washed with brine, then dried over magnesium sulfate. The suspension is filtered and the filtrate concentrated in vacuo to afford 4-[1-(4′-chloro-4-cyclopropyl-2′-fluorobiphenyl-3-yl)methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (19.80 g) which is of sufficient purity to use directly in the next step.

Provenance & Evidence