(2R)-but-3-yn-2-ol → (3Z)-5-fluoro-4-[(3R)-3-hydroxybut-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)-but-3-yn-2-ol (37 mg, 0.53 mmol) (Aldrich) 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 Cul (2 mg) in a mixture of DMF (3 mL) and Et3N (3 mL) as solvent at 80° C. for 6 hrs. Upon completion, the reaction mixture was diluted with EtOAc and extracted with H2O. The organic layer was dried over Na2SO4 and concentrated. (R)-(Z)-1,3-Dihydro-5-fluoro-4-(3-hydroxy-1-butynyl)-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one was obtained after a silica gel column with a 0-70% EtOAc in hexanes gradient and trituration with petroleum ether. (Yield 21 mg, 48%).

Provenance & Evidence