[Br:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][CH:11]=1)[O:5][CH2:6][CH2:7][OH:8].C(N(CC)CC)C.[CH3:19][S:20](Cl)(=[O:22])=[O:21]>C(Cl)Cl>[CH3:19][S:20]([O:8][CH2:7][CH2:6][O:5][C:4]1[CH:9]=[CH:10][CH:11]=[C:2]([Br:1])[CH:3]=1)(=[O:22])=[O:21]To an ice cold mixture of 2-(3-bromophenoxy)ethanol (106) (16.06 g, 74.0 mmol) and triethylamine (9.12 g, 90.13 ml) in anhydrous CH2Cl2 (120 ml) under argon was slowly added methanesulfonyl chloride (6 ml, 77.2 mmol). The reaction mixture was stirred at 0° C. for 15 min. The mixture was concentrated under reduced pressure and the residue was partitioned between EtOAc and water. The combined organics were washed with water and brine, dried over MgSO4, and concentrated under reduced pressure to give 2-(3-bromophenoxy)ethyl methanesulfonate (107) as a light brown oil. This product was used in the next synthetic step without further purification. Yield (21.32 g, 98%): 1H NMR (400 MHz, CDCl3) δ 7.16 (t, J=7.8 Hz, 1H), 7.11-7.14 (m, 1H), 7.06-7.07 (m, 1H), 6.39 (ddd, J=7.6, 2.5, 1.8 Hz, 1H), 4.54-4.57 (m, 2H), 4.21-4.24 (m, 2H), 3.08 (s, 3H).
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