To a solution of (2S)-2-methyl-1-(2-pyridinylcarbonyl)piperazine dihydrochloride (Description 16) (71 mg, 0.255 mmol) in DCM (3 ml) was added DIPEA (0.183 ml, 1.046 mmol) at room temperature and to it was slowly added 4-cyanobenzenesulfonyl chloride (56.6 mg, 0.281 mmol) and the resultant mixture then stirred for 3 h. 5 ml of water and 5 ml of DCM were added and the organic layer separated with a phase separation cartridge and then evaporated under vacuum. The crude material (120 mg) was purified via Biotage (12M silica column) using a gradient [i-hex/EtOAc] ([90/10] to [40/60]). The desired fractions were then collected and concentrated to dryness giving the title compound (48 mg) as a white solid.
