反应详情

To a stirred mixture of (3,4-dichloro-benzyl)-isopropyl-amine; compound hydrochloride (260 mg, 1.024 mmol) and (2,2-dimethyl-5-oxo-[1,3]dioxolan-4-ylidene)-acetyl chloride (190 mg, 1.0 mmol) in CH2Cl2 (20 mL) at room temperature was added diisopropylethylamine (350 μL, 2.0 mmol). After 30 min, the reaction mixture was diluted with ethyl acetate (50 mL), washed with dilute aqueous HCl (1×5 mL), water (1×10 mL), and saturated aq. NaCl (1×5 mL). The organic layer was dried over Na2SO4, filtered and concentrated to give viscous yellow oil. Purification on a silica gel column using hexanes/ethyl acetate (3:2) gave pure product as a viscous yellow oil (372 mg, 93% yield). 1H NMR (500 MHz, CDCl3) δ: 7.41–7.30 (2H, m), 7.11 (0.67H, d, J=10.1 Hz), 7.10 (0.33H, d, J=10.1 Hz), 6.22 (0.67H, s), 5.87 (0.33H, s), 4.87–4.81 (0.33H, m), 4.51 (1.34H, s), 4.47 (0.66H, s), 4.30–4.24 (0.67H, m), 1.73 (4H, s), 1.71 (2H, s), 1.21 (4H, d, J=6.2 Hz), 1.11 (2H, d, J=6.7 Hz). MS calcd for C17H20Cl2NO4 (M+H): 372.24. found: 372.18.

1. washwashed with dilute aqueous HCl (1×5 mL), water (1×10 mL), and saturated aq. NaCl (1×5 mL)
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customto give viscous yellow oil
6. customPurification on a silica gel column