反应详情

To a solution of (2-{4-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enylamino}-ethyl)-phosphonic acid diethyl ester (32 mg, 0.059 mmol) in acetic acid (0.5 mL) was added acetic anhydride (0.5 mL). The solution was stirred at room temperature for 90 minutes when it was quenched by addition of 2 drops of water. The solution was dried in vacuo and the residue was purified by RP HPLC using a C18 column with a gradient of H2O, 0.1% TFA-acetonitrile, 0.1% TFA to provide 28 mg of the product (81%) as a clear gel. The NMR data of this compound shows two rotamers in a ratio of 70:30. 1H NMR (300 MHz, CDCl3) δ 0.05 (s, 9H), 1.17-1.27 (m, 2H), 1.30 and 1.31 (t, 6H, J=7 Hz), 1.70-1.79 (m, 2H), 1.76 (s, 3H), 2.00 (s, 3H), 2.18 (s, 3H), 3.40-3.52 (m, 2H), 3.46 (d, 2H, 7 Hz), 3.77 (s, 3H), 3.79 and 3.93 (s, 3H), 4.07 (pent, 4H, J=7 Hz), 4.27-4.35 (m, 2H), 5.13 (s, 2H), 5.22-5.30 (m, 1H) ppm; 31P (121.4 MHz, CDCl3) δ 27.5 and 28.9 ppm; MS (m/z) 584.1 [M+H]+, 606.2 [M+Na]+.

1. customwas quenched by addition of 2 drops of water
2. customThe solution was dried in vacuo
3. customthe residue was purified by RP HPLC