Diisopropylethylamine → (S)-2-[4-(2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-N-[1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-butyramide

Participants

Reaction Steps

To a solution of (S)-2-[4-(2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-butyric acid (0.090 g, 0.30 mmol) in dry N,N-dimethylformamide (5 mL) was added 1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-ylamine (prepared as in Example 49 0.075 g, 0.38 mmol), and benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.200 g, 0.45 mmol). To this mixture was added N,N-diisopropylethylamine (0.117 g, 0.91 mmol) and the resulting mixture stirred at room temperature overnight. The reaction mixture was diluted with ethyl acetate and washed with an ammonium chloride solution, a saturated sodium bicarbonate solution, saturated sodium chloride solution and then dried over sodium sulfate. The solvents were evaporated and the residue was purified by AnaLogix flash chromatography (AnaLogix SuperFlash Flash Column 23 g, 100% ethyl acetate) which afforded (S)-2-[4-(2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-N-[1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-butyramide (0.061 g, 42%) as a off-white solid: LR-ES-MS m/z calculated for C23H26F2N4O5 [M+H]+ 477 observed 477.

Provenance & Evidence