Trifluoroacetic acid → 3-Methyl-4-{[(3S)-3-methyl-1-piperazinyl]sulfonyl}benzonitrile

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Reaction Steps

A solution of 1,1-dimethylethyl(2S)-4-[(4-cyano-2-methylphenyl)sulfonyl]-2-methyl-1-piperazinecarboxylate (may be prepared as described in Description 8) (2.88 g, 7.59 mmol) and TFA (10 ml, 130 mmol) in dry DCM (10 ml) was stirred at rt for 1 hour, then concentrated in vacuo, azetroping with toluene (25 ml) to give a brown oil. This was partitioned between DCM (50 ml) and sat. aq. NaHCO3 (50 ml), then the aq. layer extracted with DCM (50 ml). The combined organic layers were passed through a hydrophobic frit and concentrated in vacuo to give the title compound as a yellow oil (2.29 g).

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