HCID 13476527, compound → HCID 13476528, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 95 parts of 1-benzoyl-4-(6-fluoro-1H-indol-3-yl)-1,4-dihydropyridine and 540 parts of N,N-dimethylacetamide is hydrogenated in the Parr-apparatus with 5 parts of palladium-on-charcoal catalyst 10%. After the calculated amount of hydrogen is taken up, the catalyst is filtered off over Hyflo and the filtrate is poured onto water while stirring: an oil is precipitated. The supernatant aqueous phase is decanted and the residual oil is washed with water. The oily product is extracted with trichloromethane. The extract is dried, filtered and evaporated. The residue is washed successively with a mixture of petroleumether and 2,2'-oxybispropane, with a hydrochloric acid solution 2 N and with water, and dissolved in trichloromethane. The latter is washed with a sodium hydroxide solution 1 N and with water, dried, filtered and evaporated. The residue is heated in a small amount of N,N-dimethylacetamide at 80° C. and the mixture is allowed to stand over week-end. The solid product is filtered off, washed with a mixture of water and ethanol, and dried in vacuo at 80° C., yielding 25 parts of 1-benzoyl-4-(6-fluoro-1H-indol-3-yl)-piperidine; mp. 220° C.

Provenance & Evidence