Asymmetric Synthesis of O-Protected Acyloins Using Enoate Reductases: Stereochemical Control through Protecting Group Modification
作者:Christoph K. Winkler、Clemens Stueckler、Nicole J. Mueller、Desiree Pressnitz、Kurt Faber
DOI:10.1002/ejoc.201001042
日期:2010.11
O-Protected cyclic acyloins were obtained in nonracemic form through asymmetric bioreduction of α,β-unsaturated alkoxy ketones by using 11 different enoate reductases from the "Old Yellow Enzyme" family. The stereochemical outcome of the biotransformation could be switched by variation of the O-protecting group or by the ring size of the substrate, which allows access to both stereoisomers in up to
通过使用来自“老黄酶”家族的 11 种不同烯酸还原酶对 α,β-不饱和烷氧基酮进行不对称生物还原,以非外消旋形式获得 O-保护的环状 acyloins。生物转化的立体化学结果可以通过 O-保护基团的变化或底物的环大小来切换,这允许以高达 97% ee 的比例获得两种立体异构体,而 α-烷氧基烯酮很容易被接受为底物, β-类似物未转化。总的来说,α-烷氧基烯酮代表了一种新型的黄素依赖性烯还原酶底物。