Potassium Carbonate → 3-bromo-5-fluoro-1-trityl-1H-pyrazolo[3,4-b]pyridine

HRID 539908Notes

Reaction equation

[Br:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[C:8]([F:11])[CH:9]=2)[NH:4][N:3]=1.C([O-])([O-])=O.[K+].[K+].Cl[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][C:20]=1[CH:25]([C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>CN(C=O)C.C(OCC)(=O)C>[Br:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[C:8]([F:11])[CH:9]=2)[N:4]([C:25]([C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:19]=2)([C:32]2[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=2)[C:26]2[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=2)[N:3]=1

Participants

Conditions

Temperature: 0 °C

Procedure

A mixture of 3-bromo-5-fluoro-1H-pyrazolo[3,4-b]pyridine, 4, (0.97 g, 4.49 mmol) and K2CO3 (1.86 g, 13.47 mmol) in DMF (9.7 mL) was cooled to 0° C. Chlorodiphenylmethylbenzene (1.38 g, 4.94 mmol) was added. The mixture was stirred at room temperature overnight. The mixture was diluted with 40 mL of ethyl acetate and washed with 30 mL of water. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The product was purified by silica gel chromatography (40% ethyl acetate/hexanes) to afford 1.68 g of the desired product as a white solid: 1H NMR (300 MHz, d6-DMSO) δ 8.45-8.38 (m, 1H), 8.04 (dd, J=8.0, 2.7 Hz, 1H), 7.35-7.16 (m, 15H); LC/MS Gradient 10-90%, 0.1% formic 5 min, C18/ACN, Retention Time=3.03 min, (M+H) 459.46.

Workup

washwashed with 30 mL of water
washThe organic layer was washed with brine
dry with materialdried over Na2SO4
filtrationfiltered
concentrationconcentrated in vacuo
customThe product was purified by silica gel chromatography (40% ethyl acetate/hexanes)

Sources & evidence

ORD record: ord-df731d33607f4ff8b2bca527dd72b7fc
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08871774B2

Reaction notes

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