4-[2-(2-Ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purine-8-carbonyl]piperidine-1-carboxylic acid tert-butyl ester → 4-{1-[2-(2-Ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purin-8-yl]-1-hydroxyethyl}piperidine-1-carboxylic acid tert-butyl ester

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To a solution of 4-[2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purine-8-carbonyl]piperidine-1-carboxylic acid tert-butyl ester (177 mg, 0.31 mmol) in THF (3 mL) at 0° C. was added methylmagnesium bromide (130 μL, 0.37 mmol, 3M solution in Et2O) and the resulting mixture stirred for 1 h before further methylmagnesium bromide (130 μL, 0.37 mmol) was added. The resulting mixture was warmed to r.t. and stirred for 16 h then concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, MeOH:EtOAc, 0-10%) affording the title compound as a clear oil (104 mg, 57%). LCMS (method A): RT 3.09 min [M+H]+ 591.2

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