2-Bromoethanol → 1H-Pyrazolo(3,4-b)pyridine-1-ethanol, 3-(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)-

HRID 1382888Notes

Reaction equation

[C:1]([C:5]1[CH:6]=[C:7]([C:16]2[C:24]3[C:19](=[N:20][CH:21]=[CH:22][CH:23]=3)[NH:18][N:17]=2)[CH:8]=[C:9]([C:12]([CH3:15])([CH3:14])[CH3:13])[C:10]=1[OH:11])([CH3:4])([CH3:3])[CH3:2].Br[CH2:26][CH2:27][OH:28].C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[C:1]([C:5]1[CH:6]=[C:7]([C:16]2[C:24]3[C:19](=[N:20][CH:21]=[CH:22][CH:23]=3)[N:18]([CH2:26][CH2:27][OH:28])[N:17]=2)[CH:8]=[C:9]([C:12]([CH3:15])([CH3:14])[CH3:13])[C:10]=1[OH:11])([CH3:2])([CH3:3])[CH3:4]

Participants

Conditions

Temperature: 65 °C

Procedure

To a solution of 5 g of 3-(3,5-di-tertiary butyl-4-hydroxyphenyl)-1H-pyrazolo[3,4-b]pyridine in 40 ml of dimethylformamide are added 2.5 g of 2-bromoethanol and 2.8 g of potassium carbonate. After stirring at 65° C. for 12 hours, the resulting mixture is poured into ice-cold water and the precipitate is extracted with ethyl acetate. The ethyl acetate layer is washed with water, dried and then concentrated. The residue is recrystallized from a mixed solvent of hexane and toluene to give 4.6 g of 3-(3,5-di-tertiary butyl-4-hydroxyphenyl)-1-(2-hydroxyethyl)-1H-pyrazolo[3,4-b]pyridine as pale yellow crystals, melting at 135°-137° C.

Workup

additionthe resulting mixture is poured into ice-cold water
extractionthe precipitate is extracted with ethyl acetate
washThe ethyl acetate layer is washed with water
customdried
concentrationconcentrated
customThe residue is recrystallized from a mixed solvent of hexane and toluene

Sources & evidence

ORD record: ord-a1e40ff4667a4028802d6ee6b824b437
Source dataset: uspto-grants-1989_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04808620

Reaction notes

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