2-Aminopyridine → HCID 22497154, compound
Reaction equation
[Cl:1][CH:2]1[CH:12]=[CH:11][CH:5]2[C:6]([O:8][C:9](=[O:10])[CH:4]2[CH2:3]1)=O.[NH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][N:15]=1>>[N:15]1[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=1[N:13]1[C:9](=[O:10])[CH:4]2[CH2:3][CH:2]([Cl:1])[CH:12]=[CH:11][CH:5]2[C:6]1=[O:8]Participants
3
Conditions
- Temperature
- 130 °C
Procedure
119.5 grams (0.64 moles) of 4-chlorotetrahydrophthalic anhydride and 94.1 grams (0.64 moles) of 2-aminopyridine were added to a 500-mL, 3-necked, round-bottomed flask equipped with a Dean-Stark trap topped with a condenser, a nitrogen outlet, means for maintaining a mild sweep of nitrogen over the reaction mixture, and a magnetic stir. The material was heated to 130° C. with an externally heated oil bath to provide an easily stirred melt. The reaction was heated to 175° C. for a 45 minute period. The water of imidization collected in the Dean-Stark trap. The reaction was then heated to 220 to 225° C. for 2.5 hours and the resulting amber material was transferred into a clean glass jar. The crude material was recovered in 97% yield. HPLC analysis of the crude material indicated >98% purity of the desired compound.