Hydrochloric Acid → 3-(4-Fluorophenyl)-5-isopropyl-2-phenyl-1-piperidinopyrrole

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Reaction Steps

7.5 ml of conc. hydrochloric acid are added to 22.5 g (75 mmol) of the compound from Example 2 and 25 g (250 mmol) of N-aminopiperidine in 200 ml of toluene AR and 30 ml of dimethylformamide and the mixture is heated to reflux in a water separator for 48 hours. The mixture is cooled, diluted using 200 ml of ethyl acetate, and extracted three times using 1N hydrochloric acid and twice using saturated sodium hydrogen carbonate solution. The organic phase is dried over magnesium sulphate and concentrated in vacuo, and the residue is chromatographed on a column (silica gel 70-230 mesh, using ethyl acetate/petroleum ether 95:5).

Provenance & Evidence