The oxidative decarboxylation of cyclic α-amino acids having urethane-type N-protecting groups with lead tetraacetate [Pb (OAc) 4] gave 2-hydroxy derivatives, which were transformed into the corresponding α-aminophosphonic acid esters by treatment of trialkyl
![1-[(2,2,2-三氯苄氯)羰基]-吡咯烷-2-羧酸结构式](https://image.chemsrc.com/caspic/126/347386-09-8.png)
![1-[(4-硝基苄氧基)羰基]-吡咯烷-2-羧酸结构式](https://image.chemsrc.com/caspic/185/347386-12-3.png)
