Dimethyl Sulfoxide → [1-(4-Acetyl-phenyl)-piperidin-4-yl]-acetic acid ethyl ester

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A microwave vial was charged with 4′-fluoroacetophenone (1.2 Ml, 10.4 mmol, 1.0 equiv) and 2-(piperidin-4-yl)-acetic acid ethyl ester (3.5 g, 20.7 mmol, 2.0 equiv) in 20 Ml DMSO. The homogeneous reaction was heated to 150° C. for 20 min. The cooled reaction was then diluted with ether and washed sequentially with saturated ammonium chloride, water, and brine. The organic extracts were then dried over sodium sulphate, filtered, and concentrated in vacuo. Purification by flash chromatography (10-40% EtOAc in hexanes) afforded the title compound: 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.32 (t, J=7.07 Hz, 3H) 1.47 (d, J=12.13 Hz, 2H) 1.62 (br.s., 1H) 1.90 (d, J=12.63 Hz, 2H) 2.04-2.15 (m, J=11.18, 11.18, 7.45, 7.45, 3.79, 3.66 Hz, 1H) 2.33 (d, J=7.07 Hz, 2H) 2.57 (s, 3H) 2.97 (td, J=12.57, 2.15 Hz, 2H) 3.93 (d, J=12.88 Hz, 2H) 4.20 (q, J=7.07 Hz, 2H) 6.96 (d, J=6.82 Hz, 2H) 7.92 (d, J=9.09 Hz, 2H); (M+H)+290.1.

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