3-Nitroaniline → Propanamide, N-(3-aminophenyl)-, monohydrochloride

To a stirred solution of 3-nitroaniline, 4.2 g, 0.03 moles, in 100 ml THF was added ml of triethylamine followed by propionyl chloride, 3.5 g, 0.033 moles. The reaction was stirred at room temperature for 18 hours. then the triethylamine hydrochloride was removed by filtration. To the filtrate was added 100 ml of ethyl acetate, and the organic phase was then washed with 1N hydrochloric acid, 100 ml (twice), and then with 2N sodium hydroxide, 100 ml (twice). The organic phase was dried over magnesium sulfate and the solvent was evaporated to yield an oil. The oil was the dissolved in 100 ml of methanol and 20 ml of isopropanol/hydrochloric acid and to this solution was added 250 mg of 10% palladium on carbon. The reaction was then hydrogenated for 3 hours. The catalyst was removed by filtration and the solvent was evaporated. The residue was crystallized from hot isopropanol and ethyl acetate, and was collected by filtration, giving 3-((ethylcarbonyl)amino)aniline hydrochloride.

1. customthen the triethylamine hydrochloride was removed by filtration
2. additionTo the filtrate was added 100 ml of ethyl acetate
3. washthe organic phase was then washed with 1N hydrochloric acid, 100 ml (twice), and then with 2N sodium hydroxide, 100 ml (twice)
4. dry with materialThe organic phase was dried over magnesium sulfate
5. customthe solvent was evaporated
6. customto yield an oil
7. waithydrogenated for 3 hours
8. customThe catalyst was removed by filtration
9. customthe solvent was evaporated
10. customThe residue was crystallized from hot isopropanol and ethyl acetate
11. filtrationwas collected by filtration

ORD record

ord-d283456bdde84db488c44cae1a292cbb

Source dataset

uspto-grants-1999_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05998399