Potassium Carbonate → 2-(3-(3,5-Di-tert-butyl-4-hydroxyphenyl)-1H-pyrazolo(3,4-b)pyridin-1-yl)ethyl acetate

HRID 1382891Notes

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].C(=O)([O-])[O-].[K+].[K+].[C:31]([O:34][CH2:35][CH2:36]Br)(=[O:33])[CH3:32]>CN(C)C=O>[C:31]([O:34][CH2:35][CH2:36][N:18]1[C:19]2=[N:20][CH:21]=[CH:22][CH:23]=[C:24]2[C:16]([C:7]2[CH:8]=[C:9]([C:12]([CH3:15])([CH3:14])[CH3:13])[C:10]([OH:11])=[C:5]([C:1]([CH3:2])([CH3:3])[CH3:4])[CH:6]=2)=[N:17]1)(=[O:33])[CH3:32]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of 40 g of 3-(3,5-di-tertiary butyl-4-hydroxyphenyl)-1H-pyrazolo[3,4-b]pyridine in 300 ml of dimethylformamide are added 34,2 g of potassium carbonate and 31 g of 2-acetoxyethyl bromide, and the mixture is stirred at 60° C. for 11 hours. The resulting mixture is poured into ice-cold water and the precipitate is extracted with ethyl acetate and then the extract is washed with water, dried and concentrated. The resulting residue is recrystallized from isopropyl alcohol to give 43 g of 1-(2-acetoxyethyl)-3-(3,5-di-tertiary butyl-4-hydroxyphenyl)-1H-pyrazolo[3,4-b]pyridine as white crystals, melting at 115°-116° C.

Workup

additionThe resulting mixture is poured into ice-cold water
extractionthe precipitate is extracted with ethyl acetate
washthe extract is washed with water
customdried
concentrationconcentrated
customThe resulting residue is recrystallized from isopropyl alcohol

Sources & evidence

ORD record: ord-82f14d89fef048f9aa4d9cdc1b34b7da
Source dataset: uspto-grants-1989_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04808620

Reaction notes

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