反应详情

To a stirred solution of benzyl 4-amino-3-methoxyphenylacetate (1.36 g, 5 mmol) in THF (20 mL) was added 2-fluorophenyl isocyanate (561 ul, 5 mmol) and a catalytic amount of Et3N. The resulting mixture was stirred for 3 hr. The mixture was quenched by the addition of H2O (10 mL) and extracted with EtOAc. The extract was washed with brine, dried over MgSO4, and evaporated. The residue was chromatographed on silica-gel with CHCl3 as eluent to give 2.06 g (q.y.) benzyl 4-[N′-(2-fluorophenyl)ureido]-3-methoxyphenylacetate as a green oil. 1H-NMR (CDCl)3 δ3.63 (2H, s), 3.82 (3H, s), 5.14 (2H, s), 6.79-7.37 (12H, m), 8.01 (1H, d, J=7.8 Hz), 8.09-8.14 (1H, m).

1. customThe mixture was quenched by the addition of H2O (10 mL)
2. extractionextracted with EtOAc
3. washThe extract was washed with brine
4. dry with materialdried over MgSO4
5. customevaporated
6. customThe residue was chromatographed on silica-gel with CHCl3 as eluent