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Asymmetric Synthesis of 3-Substituted 4-Oxoesters Using the SAMP-/RAMP-Hydrazone Method
Based on aldehydes 1a—f or ketone 1g, 3-substituted 4-oxo esters 6a—g were synthesized in three steps in moderate to good overall yield (12—50%) and in excellent enantiomeric excesses (ee >90—>95%) by an Umpolung...