Potassium Carbonate → HCID 136110818, compound

Participants

Reaction Conditions

Reaction Steps

To a solution 3.2 g of the compound of Example 1 in 20 ml of dimethylformamide are added 2 g of potassium carbonate and 1.6 g of 4-chloro-4-methyl-2-oxo-1,3-dioxolane, and the mixture is stirred at 60° C. for 6 hours. The reaction mixture is poured into ice-cold water and the precipitate is extracted with ethyl acetate. After the extract is washed with water, dried and concentrated, the residue is recrystallized from a mixed solvent of hexane and toluene to give 3 g of 3-(3,5-di-tertiary butyl-4-hydroxyphenyl)-1-(4-methyl-2-oxo-1,3-dioxolan-4-yl)-1H-pyrazolo[3,4-b]pyridine as white crystals, melting at 190°-191° C.

Provenance & Evidence