4-Pentyn-2-ol, (2S)- → (s)-(z)-1,3-Dihydro-5-fluoro-4-(4-hydroxy-1-pentynyl)-3-[(3-methoxy-1h-pyrrol-2-yl)methylene]-2h-indol-2-one

Participants

Reaction Steps

Using Method C above, (S)-pent-4-yn-2-ol (44 mg, 0.52 mmol) (see below) 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 (5 mL) and Et3N (5 mL) as a solvent at 80° C. for 7 hrs. Upon completion, the reaction mixture was diluted with EtOAc and extracted with H2O. The organic layer was dried over Na2SO4 and concentrated. (S)-(Z)-1,3-Dihydro-5-fluoro-4-(4-hydroxy-1-pentynyl)-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one was obtained after silica gel column chromatography with a 0-70% EtOAc in hexanes gradient and trituration with Et2O. (Yield 30 mg, 65%).

Provenance & Evidence