反应详情

Dissolve the residue of Step A above in 40 ml. of ethanol with warming. Cool and add 40 ml. of 20% aqueous sodium hydroxide solution. Allow to stand for 2 hour and strip away the alcohol. Dilute with water and acidify with 5 N hydrochloric acid. Separate the solids by filtration and dry to obtain the title product (yield 850 mg). Purify by recrystallization from ethanol (m.p. 255°-257° C.).

1. temperatureCool
2. additionadd 40 ml
3. customSeparate the solids
4. filtrationby filtration
5. customdry