Trifluoroacetic acid → 4-(4-Bromophenoxy)piperidine

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반응 단계

A solution of 3.5 g (9.83 mmol) of 1,1-dimethylethyl 4-[(4-bromophenyl)oxy]-1-piperidinecarboxylate, prepared in Step 4.1., in 20 ml of dichloromethane is admixed with 10 ml of trifluoroacetic acid and the solution is stirred at ambient temperature for 1 hour. It is evaporated to dryness and then the residue is taken up in 30 ml of toluene, which is evaporated again to dryness. The residue is subsequently washed with pentane and then taken up in a mixture of 60 ml of dichloromethane and 20 ml of 4N aqueous ammonia solution. It is stirred vigorously for 15 minutes and then the organic phase is decanted, dried over sodium sulfate and evaporated to dryness, to give 2.7 g of product in oil form, which is used as it is in the following step.

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