一种可重复使用的非负载型金鸡纳生物碱衍生物配体与金属锇形成原位催化剂用于9种烯烃的不对称双羟化(AD)反应,表现了很好的对映选择性(85%~〉99%)和反应活性(82%~91%).将其用于催化5种烯烃不对称氨羟化(AA)反应,也表现了好的对映选择性(76%~〉99%)和反应活性(50%~72%).并采用两种不同的方法进行AD和AA反应中配体的回收和重复使用.结果表明两种方法均可有效地进行配体的再利用.
A reusable free cinchona alkaloid derivative ligand was applied to asymmetric dihydroxylation (AD) of 9 olefins with 85%~〉99% ee and 82%~91% yields. It was also applied to asymmetric aminohy- droxylation (AA) of 5 olefins with 76%~ 〉99% ee and 50%~72% yields. Two different methods for recycling ligand were tried in AD and AA reactions, respectively. The results showed that these two methods were effective in recovering and reusing the ligand.