反应详情

A solution of 5.80 g (30.0 mmoles) of 2-(2-dimethylaminoethylamino)-4,6-dimethylpyridine (from Example 1, B) and 2.20 ml (30.0 mmoles) of triethylamine in 50 ml of benzene is dried by azeotropic distillation. After adding 4.91 g (30.0 mmoles) of diisopropylcarbamoyl chloride, the reaction mixture is heated at reflux for 24 hours. The crude product, after removal of solvent, is chromatographed on silica gel using 5% methanol in chloroform as eluant. Appropriate fractions are combined, the solvent removed and product distilled through a short path still to give 2.32 g (24.1% yield) of N,N-diisopropyl-N'-(2-dimethylaminoethyl)-N'-(4,6-dimethyl-2-pyridyl)urea as a colorless oil boiling at 148°/0.35 mm.

1. temperaturethe reaction mixture is heated
2. temperatureat reflux for 24 hours
3. customThe crude product, after removal of solvent
4. customis chromatographed on silica gel using 5% methanol in chloroform as eluant
5. customthe solvent removed
6. distillationproduct distilled through a short path still