2,6-Lutidine → {[4-(4-Hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-2-methyl-but-2-enylamino]-methyl}-phosphonic Acid

Participants

Reaction Steps

To a solution of ({4-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enylamino}-methyl)-phosphonic acid diethyl ester (20 mg, 0.038 mmol) in DMF (0.5 mL) was added TMSBr (49 μL, 0.38 mmol) and 2,6-lutidine (44 μL, 0.38 mmol). The solution was stirred at room temperature for 1 hour when it was quenched by addition of methanol. The product was purified by RP HPLC using a C18 column with a gradient of H2O, 0.1% TFA-acetonitrile, 0.1% TFA to provide 5.6 mg of the product as a white solid. 1H NMR (300 MHz, CD3OD and CDCl3) δ 1.93 (s, 3H), 2.13 (s, 3H), 2.94 (br d, 2H, J=11 Hz), 3.42-3.53 (m, 2H), 3.60 (s, 2H), 3.78 (s, 3H), 5.22 (s, 2H), 5.71 (br s, 1H) ppm; 31P (121.4 MHz, CDCl3) δ 8.5 ppm; MS (m/z) 372.2 [M+H]+, 743.2 [2M+H]+.

Provenance & Evidence