Abstract
High enantioselectivity (up to 97%ee) have been achieved in the protonation of samarium enolates which were generated by SmI 2-mediated cross-coupling reaction between unsymmtrical dialkylketene and allyl iodide, using a C 2-symmetric chiral diol as a proton source. The stereochemistry of enolate formation and of the enantioselective protonation is discussed.
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