Sodium Carbonate → 7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide

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Reaction Steps

7-[[(7R)-8-Cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxylic acid 1q (100 mg, 0.23 mmol) and O-(benzotriazol-1-yl)-N,N,N′,N′-tetra methyluronium tetrafluoroborate (74 mg, 0.23 mmol) were dissolved in 20 mL of anhydrous dichloromethane followed by the addition of diisopropylethylamine (0.1 mL, 0.50 mmol) and the crude compound (2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propan-1-amine 38b (43 mg, 0.23 mmol) successively. The reaction solution was stirred for 2 hours, added with 30 mL saturated sodium carbonate solution and extracted with dichloromethane (20 mL×3). The combined organic phase was washed with saturated sodium chloride solution (20 mL), then dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to obtain the title compound 7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide 38 (40 mg, yield: 30.0%) as a white solid.

Provenance & Evidence