反应详情

2-(4-Morpholinyl)-4H-benzopyran-4-one (2.0 g, 8.0 mmol) is dissolved in CH2Cl2 (20 mL). t-Butyl hypochlorite (1.0 mL, 8.5 mmol) is added dropwise at 23° C. The reaction mixture is warmed slightly and is finished almost instantaneously. The solvent is removed in vacuo and the residue is taken up in EtOAc (200 mL). The organic layer is washed with water (2×50 mL) and brine (80 mL), then dried (MgSO4). The solution is concentrated in vacuo giving colorless crystals which are recrystallized from EtOAc to give the desired product (1.86 g, 91%) Mp 127°-8° C.; IR (mull) 2962, 2923, 2856, 1635, 1612, 1597, 1562, 1555, 1466, 1457, 1325, 1233, 1119, 872, 762 cm-1 ; 1H NMR (200 Mhz, CDCl3, δ) 8.20 (br d, J=7.5 Hz, 1H), 7.60 (ddd, J=9.1, 6.7, 1.7 Hz, 1H), 7.36 (m, 2 H), 3.88 (m, 4H), 3.74 (m, 4H); MS m/e (rel intensity) 267 (33), 266 (15), 265 (100), 231 (15), 230 (98), 209 (16), 207 (45), 120 (27), 110 (19), 41 (16); UV (EtOH) λ max (ε) 214 (18,900), 238 (18,160), 300 sh (11,530); Anal. calc'd. for C13H12NO3Cl: C, 58.76; H, 4.55; N, 5.27. Found: C, 58.82; H, 4.58; N, 5.37.

1. temperatureThe reaction mixture is warmed slightly
2. customThe solvent is removed in vacuo
3. washThe organic layer is washed with water (2×50 mL) and brine (80 mL)
4. dry with materialdried (MgSO4)
5. concentrationThe solution is concentrated in vacuo
6. customgiving colorless crystals which
7. customare recrystallized from EtOAc