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We also examined the same reduction of 2 protected with MOM, BOM, 1-ethoxyethyl (EE) and trimethylacetyl (Piv) groups using N,N-diethylaniline-borane. The reductions produced 5a with somewhat lower enantioselectivity (93-95% ee) than that for 3a protected with a THP group. The same catalytic asymmetric borane reduction for an unprotected α-hydroxy ketone 2a provided 5a in only 9% ee.
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