Triethylamine → 6,8-Dichloro-2-[[4-(4-fluorophenyl)-1-piperazinyl]methyl]-imidazo[1,2-a]pyridine

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Reaction Conditions

Reaction Steps

A mixture of 6,8-dichloro-2-(chloromethyl)imidazo[1,2-α]pyridine (0.3064 g), 1-(4-fluorophenyl)piperazine (Aldrich; 0.266 g), triethylamine (Aldrich; 0.21 mL), and ethylene glycol (2 mL) is stirred for 1 h at 80-85° C. After cooling, the mixture is partitioned between water and dichloromethane and the organic layers are washed with brine and dried over MgSO4. After concentration under reduced pressure, the residue is chromatographed on silica gel using methanol/dichloromethane (4/96) and the appropriate fractions are combined and concentrated and the residue is crystallized from ethyl acetate/hexane to give 0.3098 g of the title compound; mp 126.5-127.5° C.; MS m/z 378, 380; IR (mineral oil) 1510, 1215, 1335, 826, 1224 cm-1 ; 1H NMR (CDCl3) δ2.75, 3.15, 3.83, 6.87, 6.96, 7.26, 7.62, 8.09.

Provenance & Evidence