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0 °C

Triethylamine (181.9 mL, 1.31 mol) was added to a solution of trans-4-(4-bromophenoxy)tetrahydrofuran-3-ol from the previous step (354 g, assumed 300.6 g, 1.16 mol) in methylene chloride (2 L), and the reaction was cooled to 0° C. in an ice bath. Methanesulfonyl chloride (101.3 mL, 1.31 mol) was then added drop-wise, while keeping the reaction temperature below 5° C., and the reaction was stirred at room temperature for 18 hours. Water (1.5 L) was added, and the aqueous layer was extracted with methylene chloride. The organics were combined and dried over sodium sulfate, filtered and concentrated in vacuo to afford product as a brown oil. Yield: 399.6 g, 1.18 mol, quantitative. Material from a smaller-scale experiment carried out in similar fashion was triturated with ethanol for characterization. 1H NMR (400 MHz, CDCl3) δ 3.10 (s, 3H), 4.00 (br dd, J=10.4, 1.9 Hz, 1H), 4.07 (m, 1H), 4.16 (dd, J=11.1, 3.9 Hz, 1H), 4.23 (dd, J=10.5, 4.6 Hz, 1H), 4.98 (br d, J=4.6 Hz, 1H), 5.20 (m, 1H), 6.85 (d, J=9.1 Hz, 2H), 7.42 (d, J=9.0 Hz, 2H).

1. customthe reaction temperature below 5° C.
2. extractionthe aqueous layer was extracted with methylene chloride
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto afford product as a brown oil
7. customwas triturated with ethanol for characterization