Diisopropylethylamine → 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((S)-2-methoxy-1-methyl-ethyl)-amide

関与物質

反応手順

To a mixture of 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (2.0 g, 5.37 mmol), (S)-1-methoxypropan-2-amine (718 mg, 8.06 mmol), and HATU (4.09 g, 10.7 mmol) were added DMF (20 mL) and DIPEA (3.75 mL, 21.5 mmol) at room temperature under nitrogen atmosphere. The resulting solution was stirred for 15 h at room temperature at which time LCMS analysis and TLC (1:1, Hex:EA, Rf=0.4) system indicated the presence of the desired compound. The reaction was diluted with water (−100 mL), the organic compound was extracted with ethyl acetate (3×50 mL) and the combined extracts were washed with brine solution. After drying over MgSO4, the filtrate was concentrated to obtain the crude light brown solid (−4.1 g) which was purified by chromatography using an ISCO (120 g) column eluting with hexanes (1 min), 0-30% EA in hexanes (2 min), 30-60% EA in hexanes (15 min) to obtain 1.9 g (80%) of 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((S)-2-methoxy-1-methyl-ethyl)-amide as a white solid.

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