cis-Dihydrodiol
metabolites were obtained from dioxygenase-catalysed asymmetric dihydroxylations of five monocyclic (azabiphenyl) and four tricyclic (azaphenanthrene) azaarene substrates. Enantiopurity values and absolute configuration assignments were determined using a combination of stereochemical correlation, X-ray crystallography and spectroscopy methods. The degree of regioselectivity found during cis-dihydroxylation of monocyclic azaarenes (2,3 bond >> 3,4 bond) and of tricyclic azaarenes (bay region > non-bay region bonds) was dependent on the type of dioxygenase used. The cis-dihydrodiol metabolite from an azaarene (3-phenylpyridine) was utilised in the chemoenzymatic synthesis of the corresponding trans-dihydrodiol.
顺式二氢二醇代谢物是由五种单环(氮杂
联苯)和四种
三环(氮杂
菲)氮杂环烯底物在二氧化酶催化下进行不对称二羟基化反应得到的。利用立体
化学相关性、X 射线晶体学和光谱学方法确定了对映纯度值和绝对构型分配。在单环氮杂烯(2,3 键 >> 3,4 键)和
三环氮杂烯(湾区键 > 非湾区键)的顺式二羟基化过程中发现的区域选择性程度取决于所用二氧化酶的类型。一种氮杂烯烃(
3-苯基吡啶)的顺式二氢二醇代谢物被用于
化学合成相应的反式二氢二醇。