Methyl iodide → 6-Amino-2-[3-(2-fluorobenzyl)-1H-pyrazolo[4,3-b]pyridin-1-yl]-7-methyl-7,9-dihydro-8H-purin-8-one

Participants

Reaction Conditions

Reaction Steps

200 mg (0.392 mmol) of 2-[3-(2-fluorobenzyl)-1H-pyrazolo[4,3-b]pyridin-1-yl]pyrimidine-4,5,6-triamine (example 2A) were initially charged in tetrahydrofuran (11.1 ml) and the suspension was cooled to 0° C. Subsequently, 0.43 ml of a 1M solution of bis(trimethylsilyl)sodium amide in tetrahydrofuran was added and the mixture was stirred at 0° C. for a further 30 min. Thereafter, 24.4 μl (0.392 mmol) of iodomethane were added dropwise and the reaction mixture was stirred at RT overnight. The reaction mixture was again cooled to 0° C. and a further 12.2 μl (0.196 mmol) of iodomethane (dissolved in 1.0 ml of tetrahydrofuran) were added. Thereafter, the mixture was stirred at 0° C. for 1 h and then heated to reflux overnight. The reaction mixture was diluted with ethyl acetate and washed twice with saturated aqueous sodium hydrogencarbonate solution. The organic phase was dried over magnesium sulfate, filtered and concentrated by rotary evaporation. The residue was chromatographed on silica gel (eluent: dichloromethane/methanol 40:1) and the product fractions were concentrated. This gave 15.6 mg (10% of theory) of the title compound in solid form.

Provenance & Evidence