Water → (3Z)-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylidene]-4-{2-[(2S)-pyrrolidin-2-yl]ethynyl}-2,3-dihydro-1H-indol-2-one

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Reaction Steps

Using Method C above, (S)-N-Boc-2-ethynyl-pyrrolidine (100 mg, 0.52 mmol) (Example 87B) was coupled with (Z)-1,3-dihydro-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one (50 mg, 0.13 mmol) (Starting Material 6) using (Ph3P)4Pd (15 mg, 0.01 mmol) and a catalytic amount of Cul in a mixture of DMF (4 mL) and Et3N (4 mL) as solvent at 80° C. for 4 hrs. Upon completion, the reaction mixture was diluted with EtOAc and extracted with H2O. The organic layer was dried over Na2SO4, concentrated and the residue was chromatographed on a silica gel column with a 40-70% EtOAc in hexanes gradient. The intermediate that was obtained from this operation was directly dissolved at 0° C., in 5 mL of a solution of 50% trifluoroacetic acid in CH2Cl2 that contained 0.2 mL of H2O and stirred for 2.5 hrs. Upon completion, the reaction mixture was diluted with EtOAc and extracted with ammonium hydroxide. The organic layer was dried over Na2SO4 and concentrated. (S)-(Z)-1,3-Dihydro-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-4-[(pyrrolidin-2-yl)ethynyl]-2H-indol-2-one was obtained after reverse phase column chromatography with 0-90% MeOH in H2O gradient, a silica gel column chromatography with neat THF and a precipitatiion out of THF with excess of hexanes. (Yield 8 mg, 18%).

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