4-Benzylpiperidine → HCID 13044290, compound

Participants

Reaction Steps

In a 50 ml flask were placed 2.5 g of 9-fluoro-8-bromo-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid, 6.4 g of 4-benzylpiperidine and 25 ml of hexamethylphosphoric triamide and the mixture was stirred at 160° C. in an argon gas atmosphere for 7 hours. After disappearance of the starting materials was confirmed by thin layer chromatography, hexamethylphosphoric triamide was removed using a vacuum pump followed by cooling to room temperature. To the residue was added ethyl acetate and then several drops of concentrated hydrochloric acid and the mixture was allowed to stand in a refrigerator for 1 day. The crystals which formed were collected by filtration and recrystallized from dimethylformamide to give 0.45 g of 9-fluoro-8-(4-benzyl-1-piperidyl)-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid. m.p. 230°-232° C., white rhombic crystals.

Provenance & Evidence