Biocatalytic Asymmetric Dihydroxylation of Conjugated Mono- and Poly-alkenes to Yield Enantiopure Cycliccis-Diols
作者:Derek R. Boyd、Narain D. Sharma、Nigel I. Bowers、Ian N. Brannigan、Melanie R. Groocock、John F. Malone、Gareth McConville、Christopher C. R. Allen
DOI:10.1002/adsc.200505033
日期:2005.6
at benzylic or allylic centres. Competition from allylic hydroxylation of methyl groups was observed only when naphthalene dioxygenase was used as biocatalyst. The structures, enantiomeric excess values and absolute configurations of the bioproducts, were determined by a combination of stereochemical correlation, spectroscopy (NMR and CD) and X-ray diffraction methods. cis-1,2-Diol metabolites from
发现一系列共轭单烯烃和多烯的双加氧酶催化的不对称二羟基化反应产生相应的单醇和1,2-二氢二醇。从单取代得到的二醇的代谢物,宝石二取代的,顺式二取代的,三取代的和烯烃底物,使用的全细胞恶臭假单胞菌含有甲苯和萘双加氧酶的菌株。确定双加氧酶的选择和烯烃类型是重要因素,优选双加氧酶催化的共轭烯烃或芳烃基团的1,2-二羟基化,以及苄基或烯丙基中心的单羟基化。仅当使用萘二加氧酶作为生物催化剂时,才能观察到甲基的烯丙基羟化竞争。生物产物的结构,对映体过量值和绝对构型是通过立体化学相关性,光谱学(NMR和CD)和X射线衍射方法的组合来确定的。顺式通常观察到来自芳烃,环状烯烃和二烯的-1,2-二醇代谢物是对映纯的(> 98%ee),而来自无环烯烃的1,2-二醇的对映体过量值较低(<88%ee)。宝石-二取代的富勒烯的对映体纯的顺式-二醇代谢物被用作新的化学酶促途径中的前驱体,以生成新型的C 2-对称的酮。