to be controlled by dynamic thermodynamic resolution or dynamic kinetic resolution, depending on the electrophile. Unusually, different configurational stability is seen for the anion generated by lithiation compared to transmetallation. Configurational stability of α-lithio-N-Boc azetidine indicates instability with the N-Botc system is due to the CS group.
Sn-Li交换和“穷人霍夫曼试验”建立了α-
硫代-N-(叔丁氧
硫代羰基羰基)(Botc)氮杂
环丁烷的不对称捕集,取决于亲电试剂,可以通过动态热力学分辨率或动态动力学分辨率进行控制。与平
金属化相比,
锂化产生的阴离子具有不同的构型稳定性。α-
硫代-N -Boc氮杂
环丁烷的构型稳定性表明N- Botc系统的不稳定性是由于CS基团。