To a stirred solution of methyl 3-(2-(2-(2-(3,5-bis(hydroxymethyl)phenoxy)ethoxy)ethoxy)ethoxy)propanoate (263b) (145 mg, 0.389 mmol) in anhydrous dichloromethane (5.5 ml) was added triethylamine (0.163 ml, 1.168 mmol). The mixture was cooled to −5° C. and methanesulfonyl chloride (0.076 ml, 0.973 mmol) was added slowly. After stirring for one hour at −5° C. the reaction was quenched with cold water and extracted with cold ethyl acetate. The organic extracts were washed with cold water, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give methyl 3-(2-(2-(2-(3,5-bis((methylsulfonyloxy)methyl)phenoxy)ethoxy)ethoxy)ethoxy)propanoate. MS (m/z). found 551.1 (M+Na)+. To a stirred mixture of methyl 3-(2-(2-(2-(3,5-bis((methylsulfonyloxy)methyl)phenoxy)ethoxy)ethoxy)ethoxy)propanoate (206 mg, 0.390 mmol) and compound 8 (287 mg, 0.974 mmol) in anhydrous DMF (3.9 ml) was added potassium carbonate (269 mg, 1.949 mmol). The reaction was allowed to stir at room temperature for 18 hours. The mixture was quenched with water and extracted three times with dichloromethane. The organic extracts were washed with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. Purification by flash silica gel chromatography (5% MeOH/CH2Cl2) followed by preparative reverse phase HPLC (C18 column, eluted with CH3CN/H2O) gave compound 263c (110 mg, 30%) as a white solid. 1H NMR (400 Hz, CDCl3): δ 8.18 (d, J=8.0 Hz, 2H), 7.77 (m, 2H), 7.49 (s, 2H), 7.19 (m, 4H), 7.02 (m, 2H), 6.89 (s, 2H), 6.87 (s, 1H), 6.75 (s, 2H), 5.10 (m, 4H), 4.39 (m, 2H), 4.05 (m, 2H), 3.90 (s, 6H), 3.77 (m, 2H), 3.67 (t, J=6.4 Hz, 2H), 3.64 (m, 2H), 3.59 (s, 3H), 3.70-3.54 (m, 8H), 3.40 (m, 2H), 2.51 (t, J=6.4 Hz, 2H); MS (m/z). found 965.3 (M+H2O+Na)+, 983.3 (M+2H2O+Na)+.
