Ammonium Chloride → 8-(2,4,5-Trifluorophenyl)-1,4-dioxaspiro[4.5]decan-8-ol

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A three neck flask (2 L) under an atmosphere of nitrogen with Mg turnings (9.8 g) was stirred for 15 rain and tetrahydrofuran (90 m1L) was added and stirring continued for an additional 15 min. 1-Bromo-2,4,5-trifluorobenzene (85 g) was dissolved in tetrahydrofuran (340 mL). A portion of this solution (75 mL) was added to the stirred magnesium turnings and then heated to 50° C. The rest of the solution was added and stirring continued at the same temperature for an additional 1 h. The reaction mixture was cooled to 40° C., a solution of 1,4-dioxaspiro[4.5]decan-8-one (57.3 g) in tetrahydrofuran (275 mL) was added, and stirring continued for 10 h. The reaction mixture was poured into saturated aqueous ammonium chloride solution (970 mL) and extracted with toluene (700 mL). The organic layer was washed with water (3×700 mL), dried over anhydrous sodium sulfate, filtered and evaporated to yield the title compound as a red-orange oil which was used in the next step without further purification.

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