Desymmetrisations of 1-Alkylbicyclo[3.3.0]octane-2,8-diones by Enzymatic Retro-Claisen Reaction Yield Optically Enriched 2,3-Substituted Cyclopentanones
作者:Cheryl L. Hill、Chandra S. Verma、Gideon Grogan
DOI:10.1002/adsc.200600468
日期:2007.4.2
non-enolisable diketone substrates, and offer a potential route to decorated cyclopentanone derivatives of multiple chiral centres. Computer modelling of 1-methylbicyclo[3.3.0]octane-2,8-dione into the active site of OCH suggested that the bicyclic [3.3.0] series substrates were accommodated in the active site in similar orientation with the natural enzyme substrate, 6-oxocamphor, and would thus yield
一系列的1- alkylbicyclo [3.3.0]辛烷-2,8-二酮,通过酶促转化复古-使用重组6- oxocamphor水解酶(OCH)中过表达的克莱森反应大肠杆菌,得到光学活性的2,3-取代的环戊对映体过量最高> 95%。尽管母体底物双环[3.3.0]辛烷-2,8-二酮12转化非常缓慢,但在1位具有不同长度烷基链的衍生物13、14、15、16和30却被迅速转化到通常具有82%de的旋光产品和高达> 95%的对映体过量。结果证实了OCH对不可烯丙基二酮底物的明显要求,并为修饰多个手性中心的环戊酮衍生物提供了一条潜在途径。将1-甲基双环[3.3.0]辛烷-2,8-二酮转化为OCH活性位点的计算机模型表明,双环[3.3.0]系列底物以与天然酶底物相似的取向被容纳在活性位点中, 6-氧代樟脑,因此将产生(2 S,3 S)-产物系列。