反应详情

To a suspension of N-[(3RS)-1-ethoxycarbonylmethyl-5-(2-fluorophenyl)-2,3-dihydro-2-oxo-1H-1,4-benzodiazepin-3-yl ]-N'-(3-methylphenyl)urea (5.71 g) in a mixture of ethanol (57 ml) and THF (43 ml) was added 1N aqueous sodium hydroxide solution (47 ml) under stirring at ambient temperature. The mixture was stirred under the same condition for 1 hour and the organic solvent was removed in vacuo. The residual aqueous solution was acidified with 6N aqueous hydrochloric acid and extracted with ethyl acetate twice. The combined extract was washed with water twice and dried over magnesium sulfate. Removal of the solvent gave an amorphous mass, which was triturated in a mixture of methanol and diisopropyl ether and collected by filtration to afford N-[(3RS)-1-carboxymethyl-5-(2-fluorophenyl)-2,3-dihydro-2-oxo-1H-1,4-benzodiazepin-3-yl]-N'-(3-methylphenyl)urea (5.21 g) as a white crystalline powder, which was used in a following reaction step without further purification.

1. stirringThe mixture was stirred under the same condition for 1 hour
2. customthe organic solvent was removed in vacuo
3. extractionextracted with ethyl acetate twice
4. extractionThe combined extract
5. washwas washed with water twice
6. dry with materialdried over magnesium sulfate
7. customRemoval of the solvent
8. customgave an amorphous mass, which
9. customwas triturated in a mixture of methanol and diisopropyl ether
10. filtrationcollected by filtration