Water → (3Z)-5-fluoro-4-[(3R)-4-hydroxy-3-(methylamino)but-1-yn-1-yl]-3-[(3-methoxy-1H-pyrrol-2-yl)methylidene]-2,3-dihydro-1H-indol-2-one

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Reaction Steps

Using Method C above, (R)-2-(N-Boc-N-methylamino)-1-(tert-butyldimethylsilyloxy)-but-3-yne (130 mg, 0.42 mmol) (Example 104C) was coupled with (Z)-1,3-dihydro-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one (80 mg, 0.21 mmol) (Starting Material 6) using (Ph3P)4Pd (24 mg, 0.02 mmol) and a catalytic amount of Cul in a mixture of DMF (5 mL) and Et3N (5 mL) as solvent at 80 IC for 5 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 40-100% EtOAc in hexanes gradient. The intermediate that resulted from this operation was dissolved directly in 10 mL of a 50% trifluoroacetic acid in CH2Cl2 solution that contained 0.5 mL of H2O at 0 °C. 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. (R)-(Z)-1,3-Dihydro-5-fluoro-4-[4-hydroxy-3-methylamino-1-butynyl]-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one was obtained after silica gel column chromatography with a 0-10% MeOH in CH2Cl2 gradient and precipitation out of THF with excess of pentane. (Yield 28 mg, 38%).

Provenance & Evidence