4-Chlorophenylhydroxylamine → N'-[4,6-bis(2,2,2-trifluoroethoxy)pyrimidin-2-yl]-N-(4chlorophenyl)-N-hydroxyurea

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To a solution of 4-chloro-N-hydroxyaniline (0.423 g, 2.95 mmol (prepared according to the procedure of Rondestwedt Jr., C. S. and Johnson, T. A. Synthesis 1977, p850-851) in THF (10 mL) was added the 2-isocyanato-4,6-bis(2,2,2-trifluoroethoxy)pyrimidine (2.0 g, 6.3 mmol) in THF (10 mL) and the mixture stirred at room temperature for 12 h. The mixture was concentrated in vacuo to give a brown solid. This solid was purified by reverse phase column chromatography (CH3CN/H2O) to afford 64 as a dark brown gum (448 mg, 36% yield): ESI/MS 461 (M+H), 459 (M−H); 1H NMR (DMSO-d6): δ 11.04 (S, 1H, 9.51 (S, 1H), 7.63 (d, 2H, J=6.6 Hz), 7.41 (d, 2H, J=6.6 Hz), 6.30 (s, 1H), 5.05 (m, 4H).

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