[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([CH2:10]Br)[CH:5]=1.[P:13]([O-:25])([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14].[K+].CCOC(C)=O>C1COCC1>[C:21]([O:20][P:13]([O:25][CH2:10][C:6]1[CH:5]=[C:4]([CH:9]=[CH:8][CH:7]=1)[C:3]([O:2][CH3:1])=[O:12])([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])([CH3:24])([CH3:23])[CH3:22]To a stirred solution of methyl-3-(bromomethyl)benzoate (0.5 g, 2 mmol) in THF (10 mL) was added potassium ditertiary butyl phosphate (0.5 g, 2 mmol). The reaction flask was heated to 70° C. for 2 h. After the flask was cooled to rt, EtOAc (50 mL) was added to the mixture. The organics were washed with brine (2×10 mL), dried over anhydrous sodium sulfate, and evaporated under vacuum to yield methyl 3-((di-tert-butoxyphosphoryloxy)methyl)benzoate (0.35 g, 0.9 mmol). 1H NMR (400 MHz, CHCl3-d): δ 1.47 (s, 18H), 3.91 (s, 3H), 5.03 (d, 2H, J=7.6 Hz), 7.44 (t, J=7.6 1H), 7.60 (dd, J=1.2 and 7.2), 7.98 (ddd, J=1.2, 2.8 and 7.6, 1H), 8.05 (t, J=0.4, 1H).
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