3-(2-methoxy-phenyl)-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1-(2-trimethylsilanyl-ethoxy-methyl)-1H-pyrazolo[3,4-b]pyridine → HCID 178489373, compound

HRID 2388991Notes

Reaction equation

HRID 2388991 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:12][N:11]=[N:10][N:9]=2)=[CH:4][CH:3]=1.[CH3:13][O:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=1[C:21]1[C:29]2[C:24](=[N:25][CH:26]=[C:27](B3OC(C)(C)C(C)(C)O3)[CH:28]=2)[N:23](COCC[Si](C)(C)C)[N:22]=1>O1CCCC1.C(#N)C>[CH3:13][O:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=1[C:21]1[C:29]2[C:24](=[N:25][CH:26]=[C:27]([C:2]3[CH:7]=[CH:6][C:5]([C:8]4[NH:12][N:11]=[N:10][N:9]=4)=[CH:4][CH:3]=3)[CH:28]=2)[NH:23][N:22]=1

Participants

4

Reactant 2

HCID 598360923-(2-methoxy-phenyl)-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1-(2-trimethylsilanyl-ethoxy-methyl)-1H-pyrazolo[3,4-b]pyridineHCID 178419364HCID 178419364, compound

Product 1

HCID 178489373HCID 178489373, compoundYield 5.1%

Reagents, catalysts & solvents 1

HCID 22177404Acetonitrile tetrahydrofuranSolvent

Procedure

In a microwave vial 5-(4-bromo-phenyl)-1H-tetrazole (89.2 mg, 0.4 mmol), 3-(2-methoxy-phenyl)-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine (200 mg, 0.40 mmol) in tetrahydrofuran/aceto-nitrile/1 N aqueous sodium bicarbonate (4 ml) was degassed with nitrogen and 1,1′-bis-(diphenylphosphino)ferrocenepalladium(II)-dichloride dichloromethane adduct (32.4 mg, 0.04 mmol) was added and the vial sealed. This reaction mixture was irradiated to 150° C. for 30 minutes in a microwave reactor. The mixture was extracted with ethyl acetate (3×) and the combined organic layers were dried over magnesium sulfate and filtered through a silica gel plug MS: m/z 500.6 (M+H+). To this crude was added trifluoroacetic acid (1 ml) and the reaction mixture stirred for 16 hours at ambient temperature. The solvent was removed under reduced pressure and the resulting solid was purified by preparative mass-triggered reverse-phase HPLC to yield 3-(2-methoxy-phenyl)-5-[4-(1H-tetrazol-5-yl)-phenyl]-1H-pyrazolo[3,4-b]pyridine as a white solid (7.5 mg, 5%). 1H NMR (500 MHz, DMSO-d6) δ 3.87 (s, 3H); 6.56 (s, 3H); 7.11 (t, J=8 Hz 1H) 7.23 (d, J=8 Hz 1H); 7.48 (t, J=8 Hz, 1H); 7.66 (d, J=8 Hz 1H); 8.01 (t, J=9 Hz, 1H); 8.14 (d, J=9 Hz 1H); 8.44 (s, 1H); 8.94 (s, 1H); 13.84 (s, br, 1H); MS: m/z 369.3 (M+H+).

Workup

  1. additionwas added
  2. customThis reaction mixture was irradiated to 150° C. for 30 minutes in a microwave reactor
  3. extractionThe mixture was extracted with ethyl acetate (3×)
  4. dry with materialthe combined organic layers were dried over magnesium sulfate
  5. filtrationfiltered through a silica gel plug MS
  6. additionTo this crude was added trifluoroacetic acid (1 ml)
  7. customThe solvent was removed under reduced pressure
  8. customthe resulting solid was purified by preparative mass-triggered reverse-phase HPLC

Sources & evidence

ORD record
ord-9bdf47d0bb4843d2985e4de5084c7b74
Source dataset
uspto-grants-2012_09
Patent number
US08268994B2

Reaction notes

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