Acetonitrile → 5-bromo-3-(2-difluoromethoxy-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine

HRID 2388952Notes

Reaction equation

[F:1][CH:2]([F:19])[O:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1B1OC(C)(C)C(C)(C)O1.[Br:20][C:21]1[CH:22]=[C:23]2[C:29](I)=[N:28][N:27]([CH2:31][O:32][CH2:33][CH2:34][Si:35]([CH3:38])([CH3:37])[CH3:36])[C:24]2=[N:25][CH:26]=1.C(=O)([O-])[O-].[Na+].[Na+].C(#N)C>C1COCC1>[Br:20][C:21]1[CH:22]=[C:23]2[C:29]([C:5]3[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=3[O:3][CH:2]([F:1])[F:19])=[N:28][N:27]([CH2:31][O:32][CH2:33][CH2:34][Si:35]([CH3:38])([CH3:37])[CH3:36])[C:24]2=[N:25][CH:26]=1

Participants

Conditions

Temperature: 60 °C

Procedure

2-(2-difluoromethoxy-phenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (208 mg, 0.77 mmol), 5-bromo-3-iodo-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine (350 mg, 0.77 mmol), 1,1′-bis(diphenylphosphino)ferrocenepalladium(II)-dichloride dichloromethane adduct (28 mg, 0.035 mmol) and aqueous solution of sodium carbonate (2 M, 0.77 mL) were suspended in anhydrous THF (7 mL) and acetonitrile (7 mL) under an atmosphere of nitrogen. The mixture was stirred at 60° C. for 12 h. The cooled mixture was applied to a Varian Chemelut cartridge and eluted with ethyl acetate. Purification by flash silica gel chromatography using a gradient of ethyl acetate and hexanes afforded 355 mg (0.75 mmol, 95%) of 5-bromo-3-(2-difluoromethoxy-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine as a white solid. MS: m/z 471 [MH+] which was directly used in the next step.

Workup

washeluted with ethyl acetate
customPurification by flash silica gel chromatography

Sources & evidence

ORD record: ord-b21e257da5f74ec5a552c3ab5d74e0ff
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08268994B2

Reaction notes

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