HCID 58061055, compound → HCID 66678882, compound

Participants

Reaction Steps

To a suspension of iron (III) chloride (53.0 g, 327 mmol) in anhydrous dichloromethane (1000 ml) at 5° C. is added a second solution of 2-(5-bromo-2-cyclopropylphenyl)-4,4,6,6-tetramethyl-1,5-dioxaspiro[2.4]heptan-7-one (119.1 g, 326 mmol) in anhydrous dichloromethane (400 ml), at such a rate as to maintain an internal temperature below 10° C. After stirring for 15 minutes the reaction is quenched with distilled water (900 ml) and the mixture is allowed to warm to room temperature. The two phases are separated and the aqueous phase is extracted with dichloromethane (×2). Organics are combined and the crude product is extracted into 1M aqueous potassium carbonate, followed by acidification to pH0 with concentrated hydrochloric acid and re-extraction with dichloromethane. All organics are combined then washed with brine and dried over anhydrous magnesium sulfate. Concentration in vacuo then affords 4-(5-bromo-2-cyclopropylphenyl)-2,2,6,6-tetramethylpyran-3,5-dione as a white solid.

Provenance & Evidence