Triethylamine → (2S)-1-{(2S)-4-[2-(2-Aminopyrimidin-5-yl)-9-(cyclopropylmethyl)-6-morpholin-4-yl-9H-purin-8-yl]-2-methylpiperazin-1-yl}-1-oxopropan-2-ol

Participants

Reaction Steps

L-Lactic acid (27.1 μl, 0.31 mmol), 1-hydroxybenzotriazole monohydrate (39.3 mg, 0.26 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (73.8 mg, 0.38 mmol), and triethylamine (53.6 μl, 0.38 mmol) were added to an N,N-dimethylformamide solution (2.0 ml) of 5-{9-(cyclopropylmethyl)-8-[(3S)-3-methylpiperazin-1-yl]-6-morpholin-4-yl-9H-purin-2-yl}pyrimidin-2-amine (115.6 mg, 0.26 mmol) at room temperature. The resulting mixture was stirred for 20 hours followed by the addition of L-lactic acid (27.1 μl, 0.31 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (73.8 mg, 0.38 mmol), and triethylamine (53.6 μl, 0.38 mmol) and the resulting mixture was stirred for 3 days. L-Lactic acid (27.1 μl, 0.31 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (73.8 mg, 0.38 mmol), and triethylamine (53.6 μl, 0.38 mmol) were further added, the resulting mixture was stirred for 2 days, and then the reaction mixture was poured into methylene chloride-methanol (10:1), washed with saturated aqueous sodium hydrogen carbonate solution, and dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure and the resulting residue was purified by preparative thin layer silica gel chromatography (double development with methylene chloride:methanol=15:1) to give the title compound (89.7 mg, 67%) as a pale yellow solid.

Provenance & Evidence