Sulfur → 5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine

HRID 1916504Notes

Reaction equation

HRID 1916504 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:8]=[C:9]3[C:15](C=O)=[N:14][N:13]([CH:18]4[CH2:23][CH2:22][CH2:21][CH2:20][O:19]4)[C:10]3=[N:11][CH:12]=2)[CH:2]=1.FC1C=C(C2C(N)=C(N)C=NC=2)C=CC=1.[S]>C(O)CCC>[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:8]=[C:9]3[CH:15]=[N:14][N:13]([CH:18]4[CH2:23][CH2:22][CH2:21][CH2:20][O:19]4)[C:10]3=[N:11][CH:12]=2)[CH:2]=1

Participants

5

Reactant 3

HCID 5362487SulfurHCID 463121005-(3-Fluorophenyl)pyridine-3,4-diamineHCID 86701076HCID 86701076, compound

Product 1

HCID 867621965-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine

Reagents, catalysts & solvents 1

HCID 2631-ButanolSolvent

Procedure

A solution of 5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-3-carbaldehyde (CXXXI) (65 mg, 0.21 mmol), 5-(3-fluorophenyl)pyridine-3,4-diamine (LXXV) (45 mg, 0.22 mmol) and sulfur (7 mg, 0.22 mmol) in n-butanol (10 mL) was heated at reflux overnight. The solution was cooled to room temperature, filtered and the solvent was evaporated under reduced pressure to give crude 3-(743-fluorophenyl)-3H-imidazo[4,5-c]pyridin-2-yl)-5-(pyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine (CXXXII). CXXXII was dissolved in dry DCM (5 mL) before adding triethylsilane (84 μL, 0.52 mmol) and TFA (2.5 mL). The reaction was stirred at room temperature for 2 h under argon. The solvent was evaporated under reduced pressure; the residue was taken up water (10 mL), and basified with 5N NH4OH. The precipitates were filtered, washed by cold water and dried under vacuum at room temperature. The crude product was suspended in DCM (10 mL), sonicated briefly and then heated to boiling for 5 min. The solution was cooled to room temperature and the solids were filtered, washed with DCM and dried under vacuum at room temperature to produce 3-(7-(3-fluorophenyl)-3H-imidazo[4,5-c]pyridin-2-yl)-5-(pyridin-3-yl)-1H-pyrazolo[3,4-b]pyridine (3) as a yellow solid (53 mg, 0.13 mmol, 62% yield). 1H NMR (DMSO-d6) δ ppm 7.25-7.34 (m, 1H), 7.54-7.65 (m, 2H), 8.11-8.21 (m, 1H), 8.23-8.30 (m, 1H), 8.37-8.50 (m, 1H), 8.63-8.70 (m, 1H), 8.70-8.80 (m, 1H), 9.02-9.09 (m, 2H), 9.09-9.15 (m, 1H), 13.94 (brs, 1H), 14.59 (s, 1H); ESIMS found for C23H14FN7 m/z 408.1 (M+H).

Workup

  1. temperatureat reflux overnight
  2. filtrationfiltered
  3. customthe solvent was evaporated under reduced pressure

Sources & evidence

ORD record
ord-1bba9713eba7439593211d94a1a08f0b
Source dataset
uspto-grants-2013_12
Patent number
US08618128B1

Reaction notes

Loading…