Potassium phthalimide → (E)-ethyl 3-(6-(1,3-dioxoisoindolin-2-yl)hex-1-enyl)-5-fluoro-1-(3-(naphthalen-1-yloxy)propyl)-1H-indole-2-carboxylate

Participants

Reaction Steps

A mixture of EXAMPLE 160A (531 mg) and potassium 1,3-dioxoisoindolin-2-ide (213 mg) in N,N-dimethylformamide (10 ml) was heated at 80° C. for 8 hours. The reaction was diluted with ethyl acetate and washed with water. The organic layer was dried over sodium sulfate and was concentrated. The residue was purified by flash chromatography, eluting with 0-100% ethyl acetate in dichloromethane to give (E)-ethyl 3-(6-(1,3-dioxoisoindolin-2-yl)hex-1-enyl)-5-fluoro-1-(3-(naphthalen-1-yloxy)propyl)-1H-indole-2-carboxylate. This ester was dissolved in a mixture of tetrahydrofuran and methanol and 5 equivalents of aqueous NaOH (10%) was added. The mixture was heated at 50° C. for 5 hours. The reaction mixture was concentrated and the residue was dissolved in dimethyl sulfoxide and trifluoroacetic acid-methanol (3:1), and purified by RPHPLC to provide the title compound. 1H NMR (400 MHz, dimethyl sulfoxide-d6) δ 13.06 (s, 2H), 8.25 (t, J=5.52 Hz, 1H), 8.19 (dd, J=7.83, 1.38 Hz, 1H), 7.86 (dd, J=7.21, 1.99 Hz, 1H), 7.74 (dd, J=7.52, 1.38 Hz, 1H), 7.60-7.69 (m, 2H), 7.43-7.58 (m, 5H), 7.34-7.41 (m, 2H), 6.99-7.16 (m, 2H), 6.85 (d, J=7.36 Hz, 1H), 6.15-6.32 (m, 1H), 4.65-4.96 (m, 2H), 4.13 (t, J=5.68 Hz, 2H), 3.20-3.29 (m, 2H), 2.20-2.36 (m, 4H), 1.49-1.67 (m, 4H).

Provenance & Evidence