Water → 3-[3-(4-methyl-1-phenyl-pent-(Z)-ylidene)-2-oxo-2,3-dihydro-indol-1-ylmethyl]-benzoic acid

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Reaction Conditions

Reaction Steps

3-{3-[4-Methyl-1-phenyl-pent-(Z)-ylidene]-2-oxo-2,3-dihydro-indol-1-ylmethyl}-benzoic acid methyl ester (24 mg, 0.05 mmol) was dissolved in THF (1 ml) and water (1 ml) and LiOH.H2O (14 mg, 0.33 mmol) was added in one portion. The mixture was stirred at 50° C. for 16 h. The mixture was concentrated under reduced pressure and acidified to pH=3. Purification by preparative HPLC afforded 3-[3-(4-methyl-1-phenyl-pent-(Z)-ylidene)-2-oxo-2,3-dihydro-indol-1-ylmethyl]-benzoic acid 10 mg. 1H NMR (300 Hz, CDCl3): δ ppm 0.88 (d, 6H), 1.36-1.44 (m, 2H), 1.64-1.68 (m, 1H), 3.33-3.38 (m, 2H), 5.04 (s, 2H), 6.01 (d, 1H), 6.58-6.61 (m, 2H), 6.96-7.02 (t, 1H), 7.26-7.29 (m, 2H), 7.37 (t, 2H), 7.43-7.52 (m, 3H), 7.93 (d, 1H), 8.03 (s, 1H).

Provenance & Evidence