Cesium carbonate → N-(2-(6-amino-8-((6-iodobenzo[d][1,3]dioxol-5-yl)thio)-9H-purin-9-yl)ethyl)-2-methylpropane-2-sulfonamide

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To a solution of 8-((6-iodobenzo[d][1,3]dioxol-5-yl)thio)-9H-purin-6-amine (30.4 mg, 0.07 mmol) in 3 mL of dry DMF was added 2-methyl-propane-2-sulfonic acid (2-bromo-ethyl)-amide (90 mg, 0.37 mmol) and Cs2CO3 (80 mg, 0.25 mmol). The resulting mixture was stirred at a temperature of about 25° C. for 3 hrs, condensed under reduced pressure and purified by flash chromatography to provide compound WS42 as pale yellow solid (17 mg, 41% yield).

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