(3Z)-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylidene]-2,3-dihydro-1H-indol-2-one → Indol-2-one

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Reaction Steps

Using Method C above, Ethyl-[(3R,4S,5R)-4-ethynyl-2,2,6-trimethyl-[1,3]-dioxan-5-yl]-carbamic acid tert-butyl ester (148.5 mg, 0.50 mmol) (Example 123C above) was coupled with (Z)-1,3-dihydro-5-fluoro-4-iodo-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one (96 mg, 0.25 mmol) (Starting Material 6) using (Ph3P)4Pd (23.1 mg, 8 mol %) and CuI (5 mg) as catalyst in DMF (5 mL) and Et3N (5 mL) as solvent at 85° C. for 5 h to give the coupling product (137.2 mg, 99.2% after flash column purification). This coupling product (125 mg) was then treated with 50% of trifluoroacetic acid/CH2Cl2 (5 mL) and 0.5 mL of water at r.t. for 1 h. The reaction mixture was concentrated to about 2 mL and diluted with AcOEt (50 mL) and then quenched with 2 N NaOH. The organic layer was washed with brine and dried with Na2SO4. After concentration, the crude product (113.6 mg) was triturated with AcOEt/hexanes and the precipitate was collected by filtration to offer (Z)-1,3-Dihydro-4-[(3R,4S,5R)-3,5-dihydroxy-4-ethylamino-1-hexynyl]-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one (LLLLL) as a brown-orange solid. (Yield 29.5 mg, 31.6%). The filtrate was then purified via flash column chromatography (5%-10% MeOH in CH2Cl2) to give (R)-(Z)-1,3-Dihydro-4-[(5-ethylamino-6-methyl)-6H-pyran-2-yl]-5-fluoro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene)]-2H-indol-2-one (MMMMM). (Yield 33.6 mg, 37.6%).

Provenance & Evidence