275387-85-4 → (Z)-4-[(3R,4R)-3-Amino-4-hydroxy-1-pentynyl]-1,3-dihydro-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one

Participants

Reaction Conditions

Reaction Steps

Using Method C above, (4R,5R)-N-Boc-2,2,5-trimethyl-4-ethynyl-oxazolidine (0.18 g, 0.65 mmol) (Example 102B) was coupled with (Z)-1,3-dihydro-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one (0.1 g, 0.26 mmol) (Starting Material 6) using (Ph3P)4Pd (30 mg) and Cul (6 mg) as catalyst in DMF (6 mL) and Et3N (6 mL) as solvent at 85° C. for 1 day. To the resulting compound in CH2Cl2 (6 mL) was added a 1:1 mixture of trifluoroacetic acid/CH2Cl2 (6 mL) and 3 drops of water at 0° C. and the mixture was stirred at 0° C. for 1.5 h. The mixture was then quenched with conc. NH4OH (6 mL) and diluted with EtOAc. The organic layer was washed with brine and dried with MgSO4. (Z)-4-[(3R,4R)-3-Amino-4-hydroxy-1-pentynyl]-1,3-dihydro-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one was purified via flash column chromatography (10% MeOH in CH2Cl2). (Yield 44 mg, 48%).

Provenance & Evidence