Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 69, Issue 19, Pages 6489-6492Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo049283u
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- NIGMS NIH HHS [GM70483] Funding Source: Medline
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The Cinchona alkaloid derived chiral ammonium salt developed by Park and Jew functions as an effective catalyst for the synthesis of beta-hydroxy alpha-amino acids via asymmetric aldol reactions under homogeneous conditions. The syn diastereomers are obtained in good ee, and aryl-substituted aliphatic aldehydes are the best substrates for the reaction. These results represent the highest ee's obtained to date in direct aldol reactions of glycine equivalents catalyzed by inexpensive, readily prepared chiral ammonium salts.
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