反应详情

A suspension of 6.5 g 5-(5-chloropentyl)-3-methylisothiazole, 5.3 g potassium iodide, 9.1 g 2,6-dichloro-4-(4,5-dihydro-2-oxazolyl)phenol and 3.9 g potassium hydroxide in 300 ml acetonitrile was heated at reflux for 40 hours. Filtration, concentration and flash filtration (silica gel; 1:1 hexane/ethyl acetate) gave 9.8 g of oily product which when crystallized from hexane at Dry Ice temperature gave 5.3 g 2-{3,5-dichloro-4-[(5-(3-methyl-5-isothiazolyl)pentyl)oxy]phenyl}-4,5-dihydro-oxazole as a colorless solid, m.p. 38°-39.5° C.

1. temperaturewas heated
2. temperatureat reflux for 40 hours
3. filtrationFiltration, concentration and flash filtration (silica gel; 1:1 hexane/ethyl acetate)