Ammonia → 2-(4-Chlorophenyl)-3-(2-oxo-1-pyrrolidinylmethyl)-6-methylimidazo[1,2-a]pyridine

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An intimate mixture is prepared of 4.8 g (0.02 mol) of 2-(4-chlorophenyl)-6-methylimidazo[1,2-a]pyridine and 2.53 g (0.022 mol) of N-hydroxymethyl-2-pyrrolidinone, and this is then introduced into 20 ml of concentrated sulphuric acid. The solution is stirred for one day at room temperature, then poured into 800 ml of water, and 55 ml of ammonia solution are added. The lactam is extracted with methylene chloride, the organic phase is washed, dried and evaporated, and the residue is purified by chromatography, eluting with a 70:30 ethyl acetate, toluene mixture. The white solid obtained melts at 186°-187.5° C.

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