Sodium Hydroxide → 8-(2,4,5-Trifluorophenyl)-1,4-dioxaspiro[4.5]dec-7-ene

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Reaction Steps

To a round-bottomed flask (3 L) under nitrogen atmosphere equipped with a Dean-Stark trap, toluene (350 mL), para-toluenesulfonic acid monohydrate (p-TSA) (1 g) and 8-(2,4,5-trifluorophenyl)-1,4-dioxaspiro[4.5]decan-8-ol (94.2 g) were added and the mixture was refluxed overnight. Additional p-TSA (1 g) was added. Refluxing was continued overnight and then the reaction was stirred at room temperature for two more days. The reaction mixture was treated with 0.1N aqueous sodium hydroxide solution (500 mL) and extracted with heptanes (500 mL). The organic layer was washed with water (3×500 mL), dried over anhydrous sodium sulfate, filtered and evaporated to yield crude product which was purified by column chromatography (silica gel, gradient 2% to 40% ethyl acetate in heptanes) to yield the title compound.

Provenance & Evidence