Diisopropylamine → 2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-6-(3-hydroxy-3-methylbut-1-yn-1-yl)-7-methyl-7,9-dihydro-8H-purin-8-one

Participants

Reaction Steps

0.5 g (0.997 mmol) of the compound obtained in example 107 in tetrahydrofuran (10 ml) was admixed under argon with 251 mg (2.992 mmol) of 2-methyl-3-butyn-2-ol, 0.419 ml (2.992 mmol) of diisopropylamine, 57 mg (0.299 mmol) of copper(I) iodide and 140 mg (0.199 mmol) of dichlorobis(triphenylphosphine)palladium(II). Subsequently, the mixture was stirred at RT overnight and then heated to reflux for 10 h. After cooling, the mixture was filtered. The filtrate was concentrated, slurried in acetonitrile, water and a small amount of dimethylformamide, and filtered once again. The filtrate thus obtained was admixed with ethyl acetate and cyclohexane and stirred briefly, the precipitated residue was filtered off, and the filtrate was concentrated and purified by means of preparative HPLC (acetonitrile: water+5% trifluoroacetic acid)−gradient. 110 mg of the title compound were obtained (23% of theory).

Provenance & Evidence