4-Nitrobenzenesulfonyl chloride → [1-(4-Nitro-benzenesulfonyl)-piperidin-4-yl]carbamic acid tert-butyl ester

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Reaction Steps

Diisopropylethylamine (4.5 ml, 27.0 mmol) was added in one portion to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (5.0 g, 20.0 mmol) in DCM (40 ml) at room temperature. To this mixture was added 4-nitrophenyl sulfonyl chloride (6.0 g, 27.0 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 (100 ml) and washed sequentially with HCl (1M solution, 50 ml), NaOH (1M solution, 50 ml) and brine (50 ml). The organic layer was separated, dried (MgSO4), filtered and concentrated. The resulting solid was collected by filtration, dried with diethyl ether and dried under vacuum give the title compound (7.14 g, 74% yield) as a pale yellow solid. Tr=2.07 min m/z (ES+) (M+Na+) 408.

Provenance & Evidence