Diisopropylethylamine → 2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-5,5,5-trifluoro-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-amide

Participants

Reaction Conditions

Reaction Steps

In a round bottom flask under argon was placed 2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-5,5,5-trifluoro-pentanoic acid (182 mg, 0.50 mmol) and 1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-ylamine (prepared as in Example 49, 118 mg, 0.60 mmol) in N,N-dimethylformamide (4 mL). This mixture was treated with N,N-diisopropyethylamine (250 μL, 1.5 mmol) and (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (330 mg, 0.75 mmol) and stirred overnight at 25° C. After this time, the reaction was diluted with ethyl acetate (25 mL) and washed with a saturated aqueous solution of ammonium chloride (25 mL), saturated aqueous solution of sodium bicarbonate (25 mL) and a saturated aqueous solution of sodium chloride (25 mL), dried over sodium sulfate and concentrated with silica gel (2 g). Purification by Biotage flash chromatography (Aspire 40 g column, 80% ethyl acetate/hexanes) afforded 2-[4-(2-chloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-5,5,5-trifluoro-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-amide (216 mg, 79%) as a white foam: HR-ES-MS m/z calculated for C24H26N4O5ClF3 [M+H]+ 543.1617, observed 543.1619.

Provenance & Evidence