Triethylamine → 6-(4-Chloro-5-trifluoromethyl-pyrimidin-2-ylamino)-1,3-dihydro-indol-2-one

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To a solution of 2,4-dichloro-5-trifluoromethylpyrimidine (3.51 g; 16.2 mmol) in THF (100 mL) was added a solution of ZnCl2 (1M in ether; 16.2 mL). After 15 minutes 6-aminooxindole (2 g; 13.5 mmol) was added in small portions, followed by the dropwise addition of Et3N (1.63 g; 16.2 mmol) in 10 mL of THF. The reaction was then stirred at RT overnight. Following removal of the solvent under reduced pressure, the crude reaction was triturated from methanol and the product filtered off as a yellow solid 2.2 g (50% yield). 1H NMR (DMSO-d6, 400 MHz) δ 3.40 (s, 2H), 7.13 (d, J=8.3 Hz, 2H), 7.20 (d, J=7.9 Hz; 1H), 7.27 (br s, 1H), 8.75 (s, 1H), 10.41 (s, 1H), 10.62 (s, 1H); HPLC ret. time: 5.933 min. LRMS (M+) 329.1, 331.0.

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