Manganese 2,6-disubstituted tetraphenylporphyrins, bearing halogen atoms on the beta-positions, have been used as catalysts for the first described stereoselective epoxidation of thymidine nucleosides. The oxidations were carried out using dimethyldioxirane (DMDO) as the oxygen atom donor. The diastereoisomeric ratio of the final epoxides might be related to the hydrogen-bonding interaction between
在β-位带有卤原子的2,6-二取代四苯基
锰锰已被用作
胸苷核苷的首次立体选择性环氧化的催化剂。使用
二甲基二环氧乙烷(
DMDO)作为氧原子供体进行氧化。最终
环氧化物的非对映异构体比率可能与糖部分的OH基团与催化剂的OCH(3)基团在核苷接近大环核心的过程中的氢键相互作用有关。