反应详情

温度

110 °C

In 55 ml of concentrated hydrochloric acid was dissolved 13.4 g (28.7 mmol) of the alcohol (140a), and after the mixture was stirred with heating at 110° C. for 2 hours, a saturated aqueous sodium hydrogen carbonate solution was added to the reaction mixture. The mixture was distilled off under reduced pressure and the residue was extracted with ethyl acetate. The extract was washed with water, dried and the solvent was distilled off. The residue was purified by silica gel column chromatography (methylene chloride-ethyl acetate=9:1), the oil was treated with ether and crystallized to provide 9.1 g (yield 84%) of 5-(3,5-dichlorophenylthio)-2-hydroxymethyl-1-(2-hydroxypropyl)-4-isopropyl-1H-imidazole (141a). mp 159-161° C.

1. distillationThe mixture was distilled off under reduced pressure
2. extractionthe residue was extracted with ethyl acetate
3. washThe extract was washed with water
4. customdried
5. distillationthe solvent was distilled off
6. customThe residue was purified by silica gel column chromatography (methylene chloride-ethyl acetate=9:1)
7. additionthe oil was treated with ether
8. customcrystallized