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α-Hydroxylation of Enolates and Silyl Enol Ethers

  1. Bang-Chi Chen1,
  2. Ping Zhou2,
  3. Franklin A. Davis3,
  4. Engelbert Ciganek4

Published Online: 15 APR 2004

DOI: 10.1002/0471264180.or062.01

Organic Reactions

Organic Reactions

How to Cite

Chen, B.-C., Zhou, P., Davis, F. A. and Ciganek, E. 2004. α-Hydroxylation of Enolates and Silyl Enol Ethers. Organic Reactions. 62:1:1–356.

Author Information

  1. 1

    Bristol-Myers Squibb Company, Discovery Chemistry, Pharmaceutical Research Institute, Princeton, NJ

  2. 2

    Princeton University, Department of Chemistry, Princeton, NJ

  3. 3

    Temple University, Department of Chemistry, Philadelphia, PA

  4. 4

    Kennett Square, PA

Publication History

  1. Published Online: 15 APR 2004

Abstract

The autoxidation of enolizable carbonyl compounds was reported as early as 1871, and the accelerating action of base is well documented. The products of these reactions, however, were usually mixtures of compounds resulting from decomposition of the unstable alpha-hydroperoxy intermediates. It was not recognized until the 1960s that these intermediates can be reduced to alpha-hydroxy compounds with zinc dust. This observation laid the foundation for what has become on of the simplest and most widely used strategies for introducing a hydroxyl group adjacent to a carbonyl group, namely the oxidation of metal enolates. The alpha-hydroxy carbonyl array not only occurs in many biologically active molecules, but also serves as an important building block for synthesis.

While the oxygenation of enolates still play an important role in the synthesis of alpha-hydroxy carbonyl compounds, a variety of new, more convenient oxididizing agents, including chiral nonracemic ones, have been introduced. In addition, sily enol ethers and silyl ketene acetals can serve as educts for alpha-hydroxycarbonyl compounds. This chapter covers the literature of alpha-hydroxylation of metal enolates and silyl enol ethers up to the end of 2000. Nitriles and aza-enolates are included. The related alpha-alkoxylation, alpha-acyloxylation, and alpha-sulfonyloxylation of metal enolates are briefly discussed.

Keywords:

  • enolates;
  • silyl enol ethers;
  • silyl ketene acetals;
  • oxidants;
  • reagents;
  • mechanisms;
  • regioselectivity;
  • functional groups;
  • chemoselectivity;
  • enantioselectivity;
  • peroxy reagents;
  • hypervalent iodine;
  • hydroxylation;
  • metal oxides;
  • sulfonylaziridines;
  • scope;
  • limitations;
  • alkoxylations;
  • acyloxylations;
  • aldehyde enolates;
  • ketone enolates;
  • lactone enolates;
  • ester enolates;
  • carboxylic acid dianions;
  • amide enolates;
  • lactams;
  • nitrile anions;
  • dicarbonyl compounds;
  • unsaturated carbonyls;
  • aza-enolates;
  • experimental procedures;
  • other methods