(3Z)-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylidene]-2,3-dihydro-1H-indol-2-one → (3Z)-5-fluoro-4-[(3S)-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, (S)-2-(N-Boc-N-methylamino)-1-(tert-butyldimethylsilyloxy)-but-3-yne (190 mg, 0.61 mmol) (Example 115C above) 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 5.5 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 resulting intermediate was dissolved directly in 6 mL of a 50% trifluoroacetic acid in CH2Cl2 solution that contained 0.5 mL of H2O at 0 °C. and stirred for 2 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-4-[3-methylamino-4-hydroxy-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 32 mg, 42%).

Provenance & Evidence