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

HRID 1404274Notes

Reaction equation

F[C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][CH:3]=1.[CH2:11]([O:13][C:14](=[O:22])[CH2:15][CH:16]1[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]1)[CH3:12].CS(C)=O>CCOCC>[CH2:11]([O:13][C:14](=[O:22])[CH2:15][CH:16]1[CH2:21][CH2:20][N:19]([C:2]2[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][CH:3]=2)[CH2:18][CH2:17]1)[CH3:12]

Participants

Conditions

Temperature: 150 °C

Procedure

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, 3 H) 1.47 (d, J=12.13 Hz, 2 H) 1.62 (br.s., 1 H) 1.90 (d, J=12.63 Hz, 2 H) 2.04-2.15 (m, J=11.18, 11.18, 7.45, 7.45, 3.79, 3.66 Hz, 1 H) 2.33 (d,J=7.07 Hz, 2 H) 2.57 (s, 3 H) 2.97 (td, J=12.57, 2.15 Hz, 2 H) 3.93 (d, J=12.88 Hz, 2 H) 4.20 (q, J=7.07 Hz, 2H) 6.96 (d, J=6.82 Hz, 2 H) 7.92 (d, J=9.09 Hz, 2 H); (M+H)+ 290.1.

Workup

customThe homogeneous reaction
customThe cooled reaction
washwashed sequentially with saturated ammonium chloride, water, and brine
dry with materialThe organic extracts were then dried over sodium sulphate
filtrationfiltered
concentrationconcentrated in vacuo
customPurification by flash chromatography (10-40% EtOAc in hexanes)

Sources & evidence

ORD record: ord-f18daf86fd0e47809c174abb91c71435
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08912208B2

Reaction notes

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