反应详情

Using the procedure of Example 32, 1.91 g (10.0 mmoles) of commercially available 5-bromo-2-furan-carboxylic acid was dissolved in 10 ml of thionyl chloride and heated to reflux under nitrogen for 1 hour and the acid chloride product was recovered. A 40 ml N,N-dimethylformamide solution of 1.75 g (8.3 mmoles) of 5-chloro-2-oxindole-1-carboxamide and 3.05 g (25 mmoles) of 4-(N,N-dimethylamino)pyridine was reacted with 2.09 g (10 mmoles) of 5-bromo-2-furan carbonyl chloride in 10 ml of N,N-dimethylformamide. After a reaction time of about 45 minutes, the mixture was acidified by pouring into 250 ml of 1N HCl. The product was recrystallized from acetic acid, washed with acetic acid, then hexane and dried overnight in vacuo at room temperature. The resulting product then was dried over refluxing isopropanol under high vacuum to yield 1.37 g of the title compound.

1. temperatureheated
2. temperatureto reflux under nitrogen for 1 hour
3. customthe acid chloride product was recovered
4. customAfter a reaction time of about 45 minutes
5. customThe product was recrystallized from acetic acid
6. washwashed with acetic acid
7. dry with materialhexane and dried overnight in vacuo at room temperature
8. customThe resulting product then was dried
9. temperatureover refluxing isopropanol under high vacuum