Abstract
The conditions were found for the diastereoselective reduction of racemic ketones of the pyrazolidine series to alcohols. The latter compounds were preparatively isolated and characterized. The reduction of ketones with sodium borohydride on the surface of an adsorbent without a solvent affords predominantly one group of diastereomers, whereas the reduction with lithium tri-tert-butoxyaluminohydride in solution gives rise to another group of diastereomers.
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