Ammonia → HCID 66584742, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 8.41 g (27.7 mmol) of methyl 1-(2-aminoethyl)-5-chloro-4-(3-cyanophenyl)-1H-pyrrole-3-carboxylate in 20 ml of methanol are added 84 ml (340 mmol) of aqueous 4N hydrochloric acid solution. The formation of a white precipitate is rapidly observed and the medium then becomes clear, while the mixture is heated to 90° C. and 0.92 g (10 mmol) of paraformaldehyde is added. Heating is continued at 90° C. for 4 hours. After cooling, the reaction medium is poured into 200 ml of water and the solution is basified by adding aqueous ammonia. The product is extracted with ethyl acetate, the organic phase is dried over sodium sulfate and the solvent is evaporated off under reduced pressure to give an orange-coloured oil, which is chromatographed on a column of 80 g of silica gel, eluting with a mixture of 2% methanol in dichloromethane, to give 7.1 g of methyl 6-chloro-7-(3-cyanophenyl)-1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine-8-carboxylate in the form of a yellow oil.

Provenance & Evidence