反应详情

For the debenzylation, a suspension of 5.5 g of 1-[2(R)-[1(R)-(benzyloxycarbamoyl)-2-(3,4,4-trimethyl-2,5-dioxo-1-imidazolidinyl)ethyl]-3-cyclopentylpropionyl)piperidine VII in 40 ml of ethanol and 1.7 g of Pd/C (5%) was hydrogenated at 22°/1 bar for 4 h. The suspension was filtered, the filtrate was concentrated completely and the residue was crystallized from water, there being obtained 3.9 g (85%) of pure 1-[3-cyclopentyl-2(R)-[1(R)-(hydroxycarbamoyl)-2-(3,4,4-trimethyl-2,5-dioxo-1-imidazolidinyl)ethyl]propionyl]piperidine I. MS (EI): 436 (40%).

1. customwas hydrogenated at 22°
2. customfor 4 h
3. filtrationThe suspension was filtered
4. concentrationthe filtrate was concentrated completely
5. customthe residue was crystallized from water, there