反应详情

The ester product from part (a) is reduced in ethanol with palladium on carbon catalyst (10%) to yield 3.99 g. of 1-[N6 -[1,1-dimethylethoxy)carbonyl]-L-lysyl]L-proline, 1,1-dimethylethyl ester. This material is taken into 40 ml. of dimethylformamide and treated with (S)-N-[3-chloro-2-oxo-1-(phenylmethyl)propyl]benzamide (3.01 g.), from Example 63(b), and sodium bicarbonate (840 mg.). After stirring for 18 hours at room temperature, the reaction mixture is concentrated in vacuo, taken into ethyl acetate and washed with saturated sodium bicarbonate. The crude product (7.0 g.) is purified on a silica gel column eluting with ethyl acetate:1% methanol to give 1.7 g. of (S)-1-[N2 -[3-benzoylamino)-2-oxo-4-phenylbutyl]-N6 -[(1,1-dimethylethoxy)carbonyl]-L-lysyl]-L-proline, 1,1-dimethylethyl ester.

1. customto yield 3.99 g
2. concentrationthe reaction mixture is concentrated in vacuo
3. washwashed with saturated sodium bicarbonate
4. customThe crude product (7.0 g.) is purified on a silica gel column
5. washeluting with ethyl acetate
6. custom1% methanol to give 1.7 g