Methyl iodide → Tert-butyl 4-{2-[methyl(methylsulfonyl)amino]phenyl}piperazine-carboxylate

Participants

Reaction Steps

In a 100 mL round bottomed flask equipped with magnetic stirring was added tert-butyl 4-{2-[(methylsulfonyl)-amino]phenyl}-piperazinecarboxylate (Preparation III) (692 mg, 1.947 mmol) and DMF (5 mL). After stirring 5 min, NaH (60% oil dispersion) (100 mg, 2.5 mmol) (Aldrich) in DMF (10 mL) was added. The reaction was stirred 20 min, then iodomethane (190 μl, 3.05 mmol) (Aldrich) was added via syringe. After stirring 2.5 h, the reaction was diluted with 150 mL EtOAc and washed 75 mL each, satd NH4Cl, H2O, 10% NaHCO3 and brine. The organic layer was separated, dried over Na2SO4, filtered and concentrated in vacuo to give tert-butyl 4-{2-[methyl(methylsulfonyl)amino]phenyl}piperazine-carboxylate (700 mg). MS (ESI, pos. ion) m/z: 370(M+H), (ESI, neg. ion) m/z: 368 (M−H). Calc'd for C17H27N3O4S: 369.48.

Provenance & Evidence