反应详情

A solution of the product of Example 1 (50 mg) in hot ethanol (0.5 ml) was added to ethanolic hydrogen chloride [prepared by adding acetyl chloride (33 mg, 0.420 mmol) to ethanol (1 ml) at room temperature] in a stream with stirring at room temperature. A solid crystallised out from the initially clear solution. The suspension was stirred and cooled to 5° over 15 min then filtered under suction. The residue was washed with a little ethanol then dried at 60° in vacuo for 1 h to give the title compound (44 mg) as microcrystals, m.p. 237°-239°.

1. customA solid crystallised out from the initially clear solution
2. stirringThe suspension was stirred
3. temperaturecooled to 5° over 15 min
4. filtrationthen filtered under suction
5. washThe residue was washed with a little ethanol
6. customthen dried at 60° in vacuo for 1 h