反应详情

To a solution of L-proline t-butyl ester (1.71 g.) and 3-hydroxybenzotriazole (1.35 g.) in dichloromethane (15 ml.) dicyclohexylcarbodiimide (2.06 g.) and the product from Example 79 (2.2 g.) are added. After 18 hours stirring at room temperature, the precipitate formed is filtered off, the filtrate is washed neutral, dried and concentrated to dryness to yield 3.7 g. of the named product Rf : 0.8 (silica gel-ethyl acetate).

1. customthe precipitate formed
2. filtrationis filtered off
3. washthe filtrate is washed neutral
4. customdried
5. concentrationconcentrated to dryness
6. customto yield 3.7 g