Palladium-Catalyzed Asymmetric Hydrogenation of<i>N</i>-Hydroxy-α-imino Phosphonates Using Brønsted Acid as Activator: The First Catalytic Enantioselective Approach to Chiral<i>N</i>-Hydroxy-α-amino Phosphonates
作者:Nataliya S. Goulioukina、Ilya A. Shergold、Grigorii N. Bondarenko、Mikhail M. Ilyin、Vadim A. Davankov、Irina P. Beletskaya
DOI:10.1002/adsc.201200170
日期:2012.10.8
The enantioselective synthesis of ring-substituted [N-(hydroxy)amino](phenyl)methylphosphonic esters via asymmetric hydrogenation of the corresponding N-hydroxy-α-imino phosphonates with up to 90% ee was developed using catalytic amounts of palladium(II) acetate and (R)-BINAP in 2,2,2-trifluoroethanol with a Brønsted acid as an activator.
使用催化量的钯(II),通过不对称氢化相应的N-羟基-α-亚氨基膦酸酯(不超过90%ee),开发了环取代的[ N-(羟基)氨基](苯基)甲基膦酸酯的对映选择性合成乙酸和(R)-BINAP在2,2,2-三氟乙醇中的溶液,以布朗斯台德酸为活化剂。