Bromoform → HCID 178505978, compound
Reaction equation
[F:1][C:2]1[CH:3]=[C:4]2[C:10](N)=[N:9][NH:8][C:5]2=[N:6][CH:7]=1.N(OC(C)(C)C)=O.C(Br)(Br)[Br:20]>>[Br:20][C:10]1[C:4]2[C:5](=[N:6][CH:7]=[C:2]([F:1])[CH:3]=2)[NH:8][N:9]=1Participants
4
Conditions
- Temperature
- 61 °C
Procedure
To a mixture of 5-fluoro-1H-pyrazolo[3,4-b]pyridin-3-amine, 132a, (0.88 g, 5.79 mmol) in bromoform (8.8 mL) was added tert-butyl nitrite (1.38 mL, 11.57 mmol). This mixture was heated to 61° C. for 1 h and then heated to 90° C. for an additional hour. The mixture was cooled to room temperature and bromoform was removed under reduced pressure. The resulting crude residue was purified by silica gel chromatography (5-50% ethyl acetate/hexanes) to afford 970 mg of the desired product as a white solid: 1H NMR (300 MHz, DMSO-d6) δ 14.22 (s, 1H), 8.67 (dd, J=2.7, 1.9 Hz, 1H), 8.07 (dd, J=8.2, 2.7 Hz, 1H); LCMS Gradient 10-90%, 0.1% formic acid, 5 minutes, C18/ACN, Retention Time=2.42 minutes (M+H) 216.11.