反应详情

2-Isocyanato-4,6-bis(2,2,2-trifluoroethoxy)pyrimidine (750 mg, 2.4 mmol) was dissolved in anhydrous dioxane (15 mL). To this solution was added 4-bromo-N-methylaniline (440 mg, 2.36 mmol) and the resulting solution was stirred under an N2 atmosphere at room temperature. After ca. 12 h an LCMS analysis of the reaction indicated mostly desired product (91%). The reaction was partitioned between EtOAc and water, the organics separated and the aqueous layer extracted with EtOAc (3×50 mL). Organic extracts were combined, washed with water (2×) and once with brine. The organic layer was dried over Na2SO4, filtered, and the solvent was removed under reduced pressure to give a yellow oil. The oil was partially purified by column chromatography (silica, hexane/EtOAc) and then recrystallized (EtOAc/cyclohexane) to afford 41 as a white solid (346 mg, 29% yield): m.p. 110-111° C. Anal Calcd for C16H13BrF6N4O3: C, 38.19; H, 2.60; N, 11.13. Found: C, 38.42; H, 2.66; N, 11.20. 1H NMR (300 MHz, CDCl3) δ 9.42 (s, 1H), 7.55 (d, 2H, J=4.5 Hz), 7.26 (d, 2H, J=4.5 Hz), 6.14 (s, 1H), 4.99 (q, 4H, J=4.4 Hz), 3.28 (s, 3H).