反应详情

1-[(2S,3R)-2-benzyloxy-5-(1-naphthyl)-3-pentyl]imidazole-4-carboxamide (obtained in Example 17 or 20) (5.07 g) was dissolved in a mixture of ethanol (300 ml) and cyclohexene (150 ml) and then palladium hydroxide (20% on carbon, 5.0 g) was added. The mixture was heated under reflux for 3 days. After cooling, the catalyst was filtered and washed with ethanol. The combined filtrate and washings were concentrated in vacuo. Flash chromatography (dichloromethane:methanol=10:1) gave 1-[(2S,3R)-2-hydroxy-5-(1-naphthyl)-3-pentyl]imidazole-4-carboxamide (2.71 g, 68.4%) as a foam.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 3 days
3. temperatureAfter cooling
4. filtrationthe catalyst was filtered
5. washwashed with ethanol
6. concentrationThe combined filtrate and washings were concentrated in vacuo