Scheme 2.
Reagents and conditions: a) PivCl in pyridine, then I2 in 19:1 pyridine/H2O, then 1 M TEAB (45%); b) NaOMe, MeOH; c) H2, Pd/C, MeOH/H2O, then H2O, Dowex 50W X8 resin (H+ form), then Dowex 50W X8 resin (Na+ form) (96% over two steps).
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