Diisopropylethylamine → 4-(4-tert-Butoxycarbonylamino-piperidine-1-sulfonyl)-2-fluoro-benzoic acid methyl ester

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Reaction Steps

Diisopropylethylamine (3.2 ml, 18.5 mmol) was added in one portion to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (0.5 g, 2.5 mmol) in DCM (10 ml) at room temperature. To this mixture was added 4-chlorosulfonyl-2-fluoro-benzoic acid methyl ester (0.6 g, 2.5 mmol) in one portion and the mixture was stirred at room temperature under a nitrogen atmosphere for 1 hour. After this time the mixture was diluted with DCM (50 ml) and washed sequentially with HCl (1M solution, 10 ml), NaOH (1M solution, 10 ml) and brine (10 ml). The organic layer was separated, dried (MgSO4), filtered and concentrated. The resulting residue was purified by flash column chromatography (elution: 98% DCM, 2% Methanol) to give the title compound (0.98 g, 87% yield) as a white solid. Tr=2.08 min m/z (ES+) (M+Na+) 439.

Provenance & Evidence