反应详情

N-(5-Bromomethyl-pyridin-2-yl)-3-isopropoxy-5-(2-thiophen-3-yl-ethoxy)-benzamide (0.46 g, 0.97 mmol) was dissolved in DMF (5 mL). Triethyl phosphite (0.51 mL, 2.91 mmol) was added and the reaction mixture was subjected to microwave radiation at 180° C. for 30 minutes. The reaction mixture was concentrated under reduced pressure and partitioned in EtOAc (20 mL) and water (20 mL). The organic layer was rinsed with water (10 mL), and then a saturated sodium chloride solution (10 mL), dried over sodium sulfate, filtered, and concentrated to dark brown oil. After chromatography on silica gel with a gradient from 50-100% ethyl acetate-hexanes to 10% methanol-ethyl acetate, {6-[3-isopropoxy-5-(2-thiophen-3-yl-ethoxy)-benzoylamino]-pyridin-3-ylmethyl}-phosphonic acid diethyl ester (86.0 mg, 16.6% yield) was obtained. 1H NMR (300 MHz, DMSO-d6): δ 10.85 (s, 1H), 8.25 (s, 1H), 8.10 (d, J=6.0 Hz, 1H), 7.70 (d, J=6.0 Hz, 1H), 7.45 (d, J=3.0 Hz, 1H), 7.30 (s, 1H), 7.20 (s, 1H), 7.15 (s, 1H), 7.10 (d, J=3.0 Hz, 1H), 6.65 (s, 1H), 4.70 (m, 1H), 4.25 (t, 2H), 3.95 (m, 4H), 3.25 (d, J=12.0 Hz, 2H), 3.05 (t, 2H), 1.25 (s, 6H), 1.15 (m, 6H); LCMS (m/z): 533.2 [C26H33N2O6PS+H]+.

1. customat 180° C.
2. customfor 30 minutes
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. custompartitioned in EtOAc (20 mL)
5. washThe organic layer was rinsed with water (10 mL)
6. dry with materiala saturated sodium chloride solution (10 mL), dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated to dark brown oil