Add sarcosine methyl ester hydrochloride (0.156 g, 1.12 mmol) to a solution of N-[3-(4-acetyl-3-hydroxy-2-propyl-phenoxymethyl)-phenyl]-3-[(2,2-dimethyl-4,6-dioxo-[1,3]dioxan-5-ylidene)-hydroxy-methyl]-benzamide (0.641 g, 1.12 mmol) in toluene (0.2M). Add triethylamine (0.226 g, 2.23 mmol) and heat the solution at reflux for 24 h. Evaporate solvents and add potassium hydroxide (10 mmol) in 1:1 methanol/water (0.2M). Stir the reaction for 24 h. Precipitate product by diluting reaction mixture with water. Filter to afford the title compound (0.050 g, 0.092 mmol, 8%): 1H NMR (400 MHz, DMSO-d6) δ 0.88 (t, J=7.0 Hz, 3H), 1.50 (q, J=9.8 Hz, 2H), 2.57 (s, 3H), 2.61 (t, J=7.2 Hz, 2H), 2.81 (s, 1H), 3.31 (m, 3H), 4.03 (s, 4H)(?), 5.25 (s, 2H), 6.72 (d, J=8.6 Hz, 1H), 7.17 (d, J=7.4 Hz, 1H), 7.37 (t, J=7.8 Hz, 1H), 7.46 (m, 1H), 7.68 (s, 2H), 7.80 (d, J=9.0 Hz, 1H), 7.95 (s, 2H), 8.05 (s, 1H), 10.31 (s, 1H), 12.84 (s, 1H). MS (m/z): 541 (M−1).
