反应详情

740 mg (3.15 mmol) of 5-(4-chlorophenyl)-1-cyclopropyl-1,3-dihydro-2H-imidazol-2-one from Example 118A are dissolved in 15 ml acetonitrile and treated with 386 mg (3.15 mmol) of ethyl chloroacetate and 872 mg (6.31 mmol) of potassium carbonate. The mixture is stirred overnight under reflux. It is then concentrated, the residue is partitioned between dichloromethane and water, the organic phase is separated, and this is dried over sodium sulphate and again concentrated. The crude product is purified by flash chromatography on silica gel (eluent: first dichloromethane, then dichloromethane/methanol 200:1→100:1) and thus yields 602 mg (57% of theory) of the target compound.

1. temperatureunder reflux
2. concentrationIt is then concentrated
3. customthe residue is partitioned between dichloromethane and water
4. customthe organic phase is separated
5. dry with materialthis is dried over sodium sulphate
6. concentrationagain concentrated
7. customThe crude product is purified by flash chromatography on silica gel (eluent