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0 °C

4-Chloro-6-methylsulfanyl-1H-pyrazolo[3,4-d]pyrimidine (497 mg, 2.477 mmol) was dissolved in 5 mL dry DMF, and the reaction mixture was cooled to 0° C. Sodium hydride (109 mg of 60% suspension in mineral oil) was added, and the reaction mixture was stirred for five minutes. (2-Chloromethoxy-ethyl)-trimethyl-silane (0.52 mL, 2.922 mmol) was then added, and the reaction mixture was stirred for 10 minutes. The reaction mixture was quenched by addition to water, and was partitioned between water and ethyl acetate. The organic layer was separated, dried over MgSO4, filtered, and evaporated under reduced pressure. The residue was purified via flash chromatography using 5% EtOAc in hexanes to give 391 mg of 4-Chloro-6-methylsulfanyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-d]pyrimidine.

1. stirringthe reaction mixture was stirred for 10 minutes
2. customThe reaction mixture was quenched by addition to water
3. customwas partitioned between water and ethyl acetate
4. customThe organic layer was separated
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customevaporated under reduced pressure
8. customThe residue was purified via flash chromatography