Chlorophenyl isocyanate → methyl 3-chloro-4-[N'-(2-chlorophenyl)ureido]phenylacetate

関与物質

反応手順

To a mixture of methyl 4-amino-3-chlorophenylacetate (1.00 g, 5.01 mmol) and 2-chlorophenyl isocyanate (0.60 ml, 5.01 mmol) in THF (20 ml) was added Et3 N (0.14 ml, 1.00 mmol) at room temperature. After 1 day stirring, 2-chlorophenyl isocyanate (0.60 ml, 5.01 mmol) was added to the reaction mixture and stirred 17 h. The reaction mixture was concentrated in vacuo. The residue was triturated by the addition of n-hexane to give methyl 3-chloro-4-[N′-(2-chlorophenyl) ureido]phenylacetate (1.35 g, 76%) as a colorless powder. 1H-NMR (CDCl3) δ 3.58 (s, 3H), 3.71 (s, 2H), 7.04 (m, 3M), 7.18 (dd, J=8.5, 2.0 Hz, 1H), 7.27–7.39 (m, 3H), 8.07 (m, 2M); MS (ESI) m/z 353 (M++1), 355 (M++3), 357 (M++5).

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