Methallyl alcohol → Methyl 3-methoxy-4-(2-methylallyloxy)benzoate

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To a stirred solution of methyl 4-hydroxy-3-methoxy-benzoate (2 g, 10.98 mmol), 2-methylprop-2-en-1-ol (871.0 mg, 1.0 mL, 12.1 mmol) and triphenylphosphine (3.17 g, 2.8 mL, 12.1 mmol) in THF (63.28 mL) at 0° C. was added DIAD (2.44 g, 2.34 mL, 12.1 mmol). The ice bath was removed and the reaction was stirred at 55° C. for 16 hours. The reaction mixture was diluted with EtOAc and washed sequentially with NaHCO3 (2×20 mL) and brine (2×20 mL) solutions. The organic layer was separated, dried over Na2SO4, filtered and the solvent was evaporated under reduced pressure. The crude product was purified with silica gel using (0-30%) ethyl acetate-hexanes to yield methyl 3-methoxy-4-(2-methylallyloxy)benzoate (1.94 g, 75%) as a viscous liquid. ESI-MS m/z calc. 236.1. Found 237.1 (M+1)+. Retention time: 1.63 minutes (3 min run). 1H NMR (400 MHz, DMSO) δ 7.56 (dd, J=8.4, 2.0 Hz, 1H), 7.47 (d, J=1.9 Hz, 1H), 7.06 (d, J=8.5 Hz, 1H), 5.07 (br s, 1H), 4.97 (br s, 1H), 4.55 (s, 2H), 3.83 (s, 3H), 3.82 (s, 3H), 1.78 (s, 3H).

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