Trifluoroacetic acid → 8-(Piperidin-4-yloxy)-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one

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Reaction Steps

The solution of 0.45 g (1.17 mmol) 4-(1-oxo-1,2,3,4-tetrahydro-pyrazino[1,2-a]indol-8-yloxy)-piperidine-1-carboxylic acid tert-butyl ester in 10 mL dichloromethane was cooled to 0° C. and was treated with 5 mL (7.4 g, 65.3 mmol) trifluoroacetic acid. The cooling bath was removed and after stirring at room temperature for 1 h the volatile components were removed at a rotary evaporator. The residue was taken up in dichloromethane and washed with 1 M aqueous sodium hydroxide solution. The organic phase was dried over magnesium sulfate, filtered and evaporated to give 140 mg (42%) of the product as a white solid.

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