Table 4.
Synthesis of enantioenriched tertiary alcohols 5 and tetrahydrofuran derivatives 6.[a]
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The yield for 6 is reported as the overall yield of 3 steps. The absolute structures were assigned by analogy. Steps: i) Dowex-50W-X8 (H+ form), MeOH/H2O, 65 °C. ii) 9-BBN then NaBO3•4H2O. iii) TsCl, TEA.