反应详情

A suspension of (2-chloro-5-methoxy-4 nitrobenzyl)-phosphonic acid diethylester (Compound 56F, 10.3 g, 30.5 mmol), iron powder (16.8 g, 305 mmol) in 2M aqueous hydrochloric acid (25 mL) and ethanol (150 mL) was heated to reflux for 1 hr. The reaction mixture was cooled to RT and solid Na2CO3 (6 g) was added until the pH was 9. The reaction mixture was filtered through celite, the filter cake was washed with dichloromethane and the filtrate was concentrated to give a residue which was dissolved in ethyl acetate, washed with water, dried over sodium sulfate, filtered and concentrated to give the required material as gum (8 g, 85%). 1H NMR (400 MHz, CDCl3) δ: 6.88 (s, 1H), 6.71 (s, 1H), 4.3 (brs, 2H), 4.05-4.13 (m, 4H), 3.85 (s, 3H), 3.26 (d, J=20.50 Hz, 2H), 1.28 (t, J=7.05 Hz, 6H).

1. temperaturewas heated
2. temperatureto reflux for 1 hr
3. filtrationThe reaction mixture was filtered through celite
4. washthe filter cake was washed with dichloromethane
5. concentrationthe filtrate was concentrated
6. customto give a residue which
7. washwashed with water
8. dry with materialdried over sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated