2,2,5,5-Tetramethyltetrahydro-3-ketofuran → HCID 66823601, compound

Participants

Reaction Conditions

Reaction Steps

To an ice-cold solution of dihydro-2,2,5,5-tetramethylfuran-3-one (4.56 g, 32.10 mmol) in anhydrous 1,2-dimethoxyethane (25 ml) is added sodium methoxide (1.91 g, 35.10 mol) in one portion. After stirring at room temperature for 10 minutes a second solution of 5-bromo-2-fluorobenzaldehyde (5.93 g, 29.10 mmol) in anhydrous 1,2-dimethoxyethane (45 ml) is added dropwise, followed by stirring at 0° C. for a further 45 minutes. The reaction mixture is quenched with 2M hydrochloric acid (50 ml), then diluted with diethyl ether and the two phases separated. The aqueous phase is further extracted with diethyl ether (×2), then all organics are combined, washed with brine and dried over magnesium sulfate. After filtration the filtrate is concentrated in vacuo to afford 4-[1-(5-bromo-2-fluorophenyl)-methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (9.30 g, 96%) as a yellow gum.

Provenance & Evidence