反应详情

温度

25 °C

4-(4-chlorophenyl)-2-oxo-4-oxazoline (5.00 g) was suspended in acetonitrile (15 ml) in a reaction vessel, and the gas in the reaction vessel was substituted for nitrogen gas. The obtained suspension was cooled and conc. sulfuric acid (7.53 g) was added dropwise at 2-10° C. Then methyl acrylate (4.41 g) was added dropwise at 2-3° C. The obtained mixture was stirred at 20-30° C. for 1.5 h and methanol (15 ml) was added dropwise at 22-25° C. After cooling, water was added dropwise at 5-8° C. The precipitated crystals were collected by filtration, washed with water (25 ml), 1% aqueous sodium hydrogencarbonate (25 ml), water (25 ml) and diisopropyl ether (25 ml), and dried under reduced pressure at 40° C. for 7 h to give the title compound (5.72 g, yield 79.4%) as pale-red white crystals.

1. temperatureThe obtained suspension was cooled
2. temperatureAfter cooling
3. filtrationThe precipitated crystals were collected by filtration
4. washwashed with water (25 ml), 1% aqueous sodium hydrogencarbonate (25 ml), water (25 ml) and diisopropyl ether (25 ml)
5. customdried under reduced pressure at 40° C. for 7 h