Unexpected Stereorecognition in Nitrilase-Catalyzed Hydrolysis of β-Hydroxy Nitriles
作者:Sukanta Kamila、Dunming Zhu、Edward R. Biehl、Ling Hua
DOI:10.1021/ol061542+
日期:2006.9.1
Biocatalytic enantioselective hydrolysis of beta-hydroxy nitriles to corresponding (S)-enriched beta-hydroxy carboxylic acids has been achieved for the first time by an isolated nitrilase bll6402 from Bradyrhizobium japonicum USDA110. This offers a new "green" approach to optically pure beta-hydroxy nitriles and beta-hydroxy carboxylic acids. The observed remote stereorecognition is surprising because
New chiral acetate imide enolate for stereoselective aldol reactions
作者:Claudio Palomo、Mikel Oiarbide、Alberto González、Jesús M. García、Fabienne Berrée、Anthony Linden
DOI:10.1016/0040-4039(96)01520-1
日期:1996.9
The chiral imide acetate 4 reacts upon lithium and titanium enolate formation conditions with aldehydes in a stereoselective manner. Remarkably, aldols obtained from aromatic and α,β-unsaturated aldehydes exhibited opposite stereochemistry than those obtained from aliphatic aldehydes.
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.