Table 2. Stereoselective Synthesis of 2-Substituted Oxetan-3-ones.

^aee determined by chiral GC analysis of acetates formed by NaBH₄ reduction and then acetylation of the resulting mixture of alcohols.

^bee determined by chiral GC analysis of enantiomerically enriched monocyclic acetate formed by acetylation of 14.

^cee determined by chiral GC analysis.

^dIn all cases, racemic samples were prepared from achiral hydrazone 5 for comparison purposes.

^eSee the Supporting Information for GC conditions and chromatograms.