Journal
ORGANIC LETTERS
Volume 6, Issue 22, Pages 4097-4099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol048179w
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A new class of bis(oxazoline) ligands are introduced that feature o-alkoxyaryl substituents and provide the highest enantioselectivities yet reported for the copper-catalyzed asymmetric dienosilane aldol addition to pyruvate and glyoxylate esters. Enantioselectivities up to 98% ee (before recrystallization) and isolated yields up to 91% were observed. Additionally, chloride counterions were found to be superior to triflate for this reaction.
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