反应详情

350 mg (1.222 mmol) of ethyl (3-cyclopropyl-2-oxo-4-phenyl-2,3-dihydro-1H-imidazol-1-yl)-acetate from Example 123A are placed in 2 ml methanol, treated with 0.5 ml 20% aqueous potassium hydroxide and stirred for two hours at room temperature. The methanol is removed on the rotary evaporator, and the residue acidified with 2 N hydrochloric acid and extracted with dichloromethane. The organic phase is separated, dried over sodium sulphate and concentrated. It is purified by flash chromatography on silica gel (eluent: dichloromethane/methanol first 50:1, then 25:1). 166 mg (53% of theory) of the target compound are thus obtained.

1. customThe methanol is removed on the rotary evaporator
2. extractionextracted with dichloromethane
3. customThe organic phase is separated
4. dry with materialdried over sodium sulphate
5. concentrationconcentrated
6. customIt is purified by flash chromatography on silica gel (eluent
7. custom166 mg (53% of theory) of the target compound are thus obtained