Benzenesulfonyl chloride → 1-[2-(2,4-Difluorophenyl)ethyl]-4-phenylsulphonylpiperazine

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Reaction Steps

Benzene sulphonyl chloride (0.15 g), the foregoing amine (0.193 g) and potassium carbonate (0.118 g) were heated together in MeCN (10 ml). Reaction was monitored by mass spectroscopy, and was completed after 2 h. The reaction mixture was cooled to room temperature, quenched with water and extracted into ethyl acetate. The organic extracts were combined, washed with water, dried (MgSO4) and concentrated to give a dark orange solid. This solid was purified by dry flash chromatography using SiO2, CH2Cl2 to 5% MeOH:CH2Cl2, followed by recrystallisation using pet. ether and CH2Cl2 to give the title product as a pale yellow solid (23%). MS: (M+H)+=367. δH (360 MHz, CDCl3): 2.50-2.60 (6H, m), 2.66-2.74 (2H, m), 3.02-3.10 (4H, m), 6.70-6.80 (2H, m), 7.05-7.14 (1H, m), 7.50-7.56 (2H, m), 7.56-7.62 (1H, m), 7.74-7.80 (2H, m). CHN C18H20 F2N2O2S: calc. C=59.00, H=5.50, N=7.65%; found C=59.12, H=5.43, N=7.56%.

Provenance & Evidence