Trifluoroacetic acid → 2,2,2-Trifluoro-1-[7-(phenylmethyl)-4,7-diazaspiro[2.5]oct-4-yl]ethanone

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Reaction Steps

Anhydrous trifluoroacetic acid (8.50 ml, 61.1 mmol) was added dropwise to a methylene chloride (200 ml) solution of the compound (10.3 g, 50.9 mmol) obtained in Step 3 above and triethylamine (17 ml, 122 mmol) with ice cooling and the resulting mixture was stirred at the same temperature for 1 hour. Saturated aqueous sodium bicarbonate solution was added to the reaction mixture, the resulting mixture was diluted with chloroform, washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (15.5 g, 100%) as a colorless oil.

Provenance & Evidence