HCID 19031237, compound → HCID 19031173, compound

Participants

Reaction Steps

A mixture of 10% palladium-carbon (0.4 g) and acetic acid (50 ml) is added to 6-nitro-1-[1-(2,4-dimethoxybenzoyl)-4-piperidinyl]-3,4-dihydrocarbostyril (4.0 g) and the mixture is subjected to catalytic reduction at 70° C. for 1 hour. The catalyst is filtered off and the filtrate is concentrated. The resulting residue is basified with 10% aqueous sodium hydroxide solution and extracted with dichloromethane. The solvent is concentrated and the resulting residue is purified by silica gel column chromatography (solvent; dichloromethane:methanol=20:1) to give 6-amino-1-[1-(2,4-dimethoxybenzoyl)-4-piperidinyl]-3,4-dihydrocarbostyril (1.9 g).

Provenance & Evidence