quantitative yields and high enantiomeric purity (89–95% ee) were attained in the course of 100 reaction cycles of a polystyrene resin-supported Cinchona alkaloid organocatalyst in the enantioselective α-amination of 2-oxindoles with diethyl azodicarboxylate. The catalytic material proved stable for >5300 h operation time over 8 months.
在2-氧
吲哚与
偶氮二甲酸二乙酯的对映选择性α-胺化反应中,聚
苯乙烯树脂负载的
金鸡纳
生物碱有机催化剂的100个反应循环中,获得了近乎定量的产率和高对映体纯度(89-95%ee)。证明该催化材料在8个月内可稳定运行> 5300 h。