Asymmetric Organocatalyzed Direct Aldol Additions of Enolizable Aldehydes

[摘要]：The enantioselective direct cross-aldol addition between enolizable aldehydes is of great importance because this transformation provides access to configurationally defined beta-hydroxyaldehydes. These products in turn are valuable building blocks in total syntheses of natural polyketide structures. This account gives an overview of advances made in this field of organocatalysis. 1 Introduction 2 Direct Aldol Additions of Enolizable Aldehydes Catalyzed by Proline, Proline Derivatives, and Imidazolidinone 2.1 Direct Aldol Additions Catalyzed by Proline and Proline Derivatives 2.2 Direct Aldol Additions Catalyzed by Imidazolidinone 3 Direct Aldol Additions of Enolizable Aldehydes Catalyzed by Histidine 4 Conclusion

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