The (dl) α‐keto esters 16, were prepared from the (dl) carbinols 1 to 4 and from (dl)‐2‐hydroxyheptahelicene 5. These (dl) α‐keto esters underwent NaBH4 reductions to give the corresponding diastereomeric (dl) α‐hydroxy esters 17, with 54 to ∼100% diastereomeric excesses.
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Hassine et al. (1985) studied this question.
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