反应详情

A solution of 20 g. of 2-aminobenzimidazole (II) in 150 ml. of pyridine is cooled to -20°C. and 20 g. of 3-furoyl chloride is added thereto. The thus-obtained reaction mixture is allowed to warm slowly to between 20°-30°C. (room temperature), and maintained at this temperature for 15 hours, diluted with water and filtered to give a residue which is recrystallized from acetic acid to yield 2-(3-furylcarbonylamino)-benzimidazole [(III), R = 3-furyl].

1. customThe thus-obtained reaction mixture
2. temperaturemaintained at this temperature for 15 hours
3. filtrationfiltered
4. customto give a residue which
5. customis recrystallized from acetic acid