1-Methylpiperazine → 1-Methyl-4-({(2S)-1-[(4-methylphenyl)sulfonyl]pyrrolidin-2-yl}methyl)piperazine

Participants

Reaction Conditions

Reaction Steps

To a solution of {(2S)-1-[(4-methylphenyl)sulfonyl]pyrrolidin-2-yl}methyl 4-methylbenzenesulfonate (9.427 g, 23.13 mmol) (Tetrahedron, 43(14), 3289, 1987) in toluene (150 mL), was added n-methyl-piperazine (12.8 mL, 115.65 mmol) and DBU (0.352 g, 2.313 mmol) and the solution was stirred at 140° C. overnight. The reaction was then diluted with ether and washed with brine. The organic layer was dried over Na2SO4, filtered, concentrated and purified on Biotage flash 40M cartridge silica gel eluting with CH2Cl2/CH3OH/NH4OH (95.5/3/1.5) to give an off white solid (2.570 g, 55% ). NMR (400 Mz, DMSO-d6): consistent. MS (ES+) m/z 338.1 [M+H]. m.p.: 96.5-97.7° C. Reference: (Tetrahedron, 43(14), 3289, 1987).

Provenance & Evidence