Isatin → 1-(5-Chloro-thiophen-2-yl-methyl)-1h-indole-2,3-dione

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A solution of isatin (125 mg, 0.85 mmol) in anhydrous dioxane (10 mL) was added dropwise to a solution of sodium hydride (60% dispersion in mineral oil, 24 mg, 0.62 mmol) in anhydrous dioxane. (10 mL) at 0° C. under argon. The mixture was allowed to stir for 5 minutes and then 2-chloro-5-(chloromethyl)thiophene (0.12 mL, 1.02 mmol) in dioxane (10, mL) was added dropwise to the resulting mixture. The reaction mixture was heated at reflux under argon for 16 h and concentrated in vacuo. The crude material was purified preparative TLC using 1:24 methanol in chloroform as the eluent, giving the desired product as a yellow solid (53 mg, 0.19 mmol, 22%). 1H NMR (400 MHz): E 7.62 (d, J=7.4, 1H), 7.56 (t, J=7.8, 1H), 7.14 (t, J=7.7, 1H), 6.94 (d, J=8.0, 1H), 6.90 (d, J=3.2, 1H), 6.78 (d, J=3.7, 1H), 4.90 (s, 2H).

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