反应详情

A 2.0 g (6.15 mmol) portion of the product of Example 26 was stirred with 10 ml of acetic anhydride at 25° C. for 3 hours then 50 ml of distilled water were added and the stirring was continued for one hour. The yellow precipitate formed was filtered, washed with 3×10 ml of distilled water and dried at 80°-100° C. to obtain 2.6 g of raw product. After recrystallization from 10 ml of ethanol 1.94 g (85.8%) of the aimed product were obtained, m.p.: 140°-142° C.

1. customThe yellow precipitate formed
2. filtrationwas filtered
3. washwashed with 3×10 ml of distilled water
4. customdried at 80°-100° C.