Acetic Acid Aldol Reactions in the Presence of Trimethylsilyl Trifluoromethanesulfonate
作者:C. Wade Downey、Miles W. Johnson、Daniel H. Lawrence、Alan S. Fleisher、Kathryn J. Tracy
DOI:10.1021/jo100828c
日期:2010.8.6
TMSOTf and a trialkylamine base, aceticacid undergoes aldol addition to non-enolizable aldehydes under exceptionally mild conditions. Acidic workup yields the β-hydroxy carboxylic acid. The reaction appears to proceed via a three-step, one-pot process, including in situ trimethylsilyl ester formation, bis-silyl ketene acetal formation, and TMSOTf-catalyzed Mukaiyama aldol addition. Independently synthesized
α-ketoglutarate-dependent aryloxyalkanoate dioxygenases (AADs) are repurposed for applications in biocatalytic oxyfunctionalization. Activity profiling of natural AADs enabled the synthesis of four types of α-and β-hydroxy acids with broad scope, high efficiency, and good selectivity.
(EN) Novel renin inhibitory peptides of the formula X-A-B-C-D-E-F-G-H-Z wherein E-F is a dihalo-substituted statine group, X and Z are terminal groups, and the remaining variables are absent or amino acid residues. These compounds are useful for administration to humans to treat hypertension.(FR) Nouveaux peptides inhibiteurs de rénine de formule X-A-B-C-D-E-F-G-H-Z, où E-F est un groupe statine à substitution dihalo, X et Z sont des groupes terminaux, et les variables restantes sont absentes ou sont des résidus d'acides aminés. Ces composés sont utiles dans le traitement de l'hypertension chez l'homme.