反应详情

N,N'-dicyclohexylcarbodiimide (10.3 g; 0.05 moles) and 1-cyclohexylmethyl-4-aminopiperidine (9.8 g; 0.05 moles) were added successively to a solution of 2-methoxy-4-acetamido-5-chlorobenzoic acid (12.1 g; 0.05 moles) in methylene chloride (250 ml). After stirring overnight at room temperature, the insoluble N,N'-dicyclohexylurea was filtered off, the solution was washed with water, dried (Na2SO4) and the solvent removed in vacuo. The residue was recrystallized and the product converted into its hydrochloride to give 14.2 g of N-(1-cyclohexylmethylpiperid-4-yl)-2-methoxy-4-acetamido-5-chlorobenzamide hydrochloride monohydrate, m.p. 219°-221° C.

1. filtrationthe insoluble N,N'-dicyclohexylurea was filtered off
2. washthe solution was washed with water
3. dry with materialdried (Na2SO4)
4. customthe solvent removed in vacuo
5. customThe residue was recrystallized