4-Piperidinecarboxylic acid → 5-Bromo-7-fluoro-2-(piperidin-4-yl)benzo[d]oxazole
Reaction equation
[NH2:1][C:2]1[CH:7]=[C:6]([Br:8])[CH:5]=[C:4]([F:9])[C:3]=1[OH:10].[NH:11]1[CH2:19][CH2:18][CH:14]([C:15](O)=O)[CH2:13][CH2:12]1.[OH-].[Na+]>>[Br:8][C:6]1[CH:5]=[C:4]([F:9])[C:3]2[O:10][C:15]([CH:14]3[CH2:18][CH2:19][NH:11][CH2:12][CH2:13]3)=[N:1][C:2]=2[CH:7]=1Participants
4
Conditions
- Temperature
- 195 °C
Procedure
2-amino-4-bromo-6-fluorophenol (1.7 g, 8.24 mmol) and isonipecotic acid (1.06 g, 8.24 mmol) were dissolved in polyphosphoric acid (28 g). This mixture was heated to 195° C. for 3 h. After 3 h, reaction mixture cooled to rt and basified with aqueous NaOH solution to pH 14. Solid that obtained was filtered and dried to obtain the title compound (1.3 g) as a brown solid.