Sodium Hydroxide → 1-(2,5-Difluorophenyl)piperazine hydrochloride

Participants

Reaction Conditions

Reaction Steps

0.03 Mol of 2,5-difluoroaniline and 0.03 mol of bis-(2-chloroethyl)amine hydrochloride are suspended in 50 mL of xylene and 15 mL of NMP. The mixture is heated at 130° C. for 25 h while stirring, then cooled to RT and the solvents are evaporated. The residue is dissolved in water and 1 equivalent of 2N aqueous sodium hydroxide (NaOH) is added. The mixture is extracted with dichloromethane (DCM), and the organic layer is dried over anhydrous MgSO4, filtered and evaporated to dryness in vacuo. The residue is dissolved in acetone and 1 equivalent of HCL in diethyl ether (Et2O) is added. The precipitated product is collected by filtration and recrystallized from isopropanol to afford 1-(2,5-difluorophenyl)piperazine hydrochloride: m.p. 195° C. LC/MS (M+1=199.1). 1H NMR (DMSO-d6, 400 MHz) δ 3.22 (m, 4H), 3.28 (m, 4H), 6.83 (m, 1H), 6.97 (m, 1H), 7.22 (m, 1H), 9.46 (brs, NH).

Provenance & Evidence