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2-({4-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enyl}-phenoxy-phosphinoylamino)-propionic acid ethyl ester (7.5 mg, 0.012 mmol) was dissolved in TFA/DCM (10%, 0.3 mL) at −20° C. The reaction mixture was warmed to 0° C. and stirred at this temperature for 45 minutes. Pyridine (0.09 mL) was added the solvents were removed in vacuo. The crude material was purified by RP-HPLC (eluent: water/MeCN). The product-containing fractions were combined and lyophilized, yielding a white powder (5.5 mg, 87%). 1H NMR (300 MHz, CDCl3): δ=1.12-1.29 (m, 6H), 2.03 (s, 3H), 2.17 (s, 3H), 2.65-2.74 (m, 4H), 3.38 (m, 1H), 3.53 (t, J=6.3 Hz, 2H), 4.03 (m, 3H), 5.22 (s, 2H), 5.36 (m, 1H), 7.11-7.16 (m, 3H), 7.24-7.30 (m, 2H), 7.72 (m, 1H) ppm; 3P NMR (121 MHz, CDCl3): δ=27.11, 27.57 ppm; MS=515 [M++1].

1. customwere removed in vacuo
2. customThe crude material was purified by RP-HPLC (eluent: water/MeCN)