反应详情

Di-tert-butyl [4-(1,3-dioxolan-2-yl)-3-fluorophenyl](methyl)malonate (0.91 g, 2.30 mmol) and thiourea (0.87 g, 11.4 mmol) were stirred in refluxing EtOH/H2O (6.7 mL/6.7 mL) for 7 hours. Room temperature was attained and the solvent removed in vacuo. H2O (100 mL) was added to the residue and the products extracted into EtOAc (2×100 mL). The combined organic extracts were washed with brine, dried over MgSO4 and concentrated in vacuo to give 0.81 g of clean product (pale yellow gum, 100%). 1H NMR (CDCl3) δ 10.33 (s, 1H), 7.82 (t, J=8.1 Hz, 1H), 7.31 (dd, J=8.1, 1.8 Hz, 1H), 7.27 (dd, J=12.0, 1.8 Hz, 1H), 1.77 (s, 3H), 1.46 (s, 18H).

1. customRoom temperature
2. customthe solvent removed in vacuo
3. additionH2O (100 mL) was added to the residue
4. extractionthe products extracted into EtOAc (2×100 mL)
5. washThe combined organic extracts were washed with brine
6. dry with materialdried over MgSO4
7. concentrationconcentrated in vacuo