Catalytic Asymmetric Synthesis of Functionalized α,α-Disubstituted α-Amino Acid Derivatives from Racemic Unprotected α-Amino Acids via in-situ Generated Azlactones
作者:Manuel Weber、Wolfgang Frey、René Peters
DOI:10.1002/adsc.201200085
日期:2012.5.21
Masked and activated highly enantioenriched α,α‐disubstituted α‐amino acids with an additional adjacent stereocenter were formed by a tandem reaction involving five steps using racemic unprotected amino acid substrates. Key step is the 1,4‐addition of in‐situ generated azlactones to a broad number of enones. The products of this step‐economic route can, e.g., be useful for a divergent and rapid access
通过外消旋未保护氨基酸底物的串联反应,包括五个步骤,形成了具有额外相邻立体中心的被掩蔽和活化的高度对映体富集的α,α-二取代的α-氨基酸。关键步骤是将1,4原位生成的a内酯添加到大量的烯酮中。这种循序渐进的经济途径的产品,例如,对于分散和快速获得生物学上令人关注的非天然谷氨酸衍生物很有用。