Dicyclohexylcarbodiimide → (2R)-4-{(2R)-4-[2-(2-Aminopyrimidin-5-yl)-9-isobutyl-6-morpholin-4-yl-9H-purin-8-yl]-2-methylpiperazin-1-yl}-4-oxobutan-2-ol

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5-{9-Isobutyl-8-[(3R)-3-methylpiperazin-1-yl]-6-morpholin-4-yl-9H-purin-2-yl}pyrimidin-2-amine (150 mg, 0.33 mmol), dicyclohexylcarbodiimide (103 mg, 0.5 mmol), 1-hydroxybenzotriazole (45 mg, 0.33 mmol), and (R)-3-hydroxybutyric acid (70 mg, 0.67 mmol) were dissolved in dimethylformamide (5 ml) and the resulting mixture was stirred at 40° C. for 16 hours. The solvent was evaporated under reduced pressure and then the residue was purified by preparative HPLC (column, NOMURA Develosil Combi-RP-5; mobile phase, acetonitrile/water/formic acid) to give the title compound (90 mg, 50%) as a white solid.

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