Kinetic and Dynamic Kinetic Resolution of Racemic Tertiary Bromides by Pentanidium‐Catalyzed Phase‐Transfer Azidation
作者:Jingyun Ren、Xu Ban、Xin Zhang、Siu Min Tan、Richmond Lee、Choon‐Hong Tan
DOI:10.1002/anie.202000138
日期:2020.6.2
azides and bromides through pentanidium-catalyzed kinetic resolution (KR) of racemic tertiary bromides under base-free conditions. We found that the absence of water is crucial to attain a high selectivity factor (s). On the other hand, new experimental observations and DFT modeling led us to propose that enantioconvergent azidation of tertiary bromides proceeded through dynamic kinetic resolution
我们已经开发出一种方法,可在无碱条件下通过戊二烯催化的外消旋叔溴化物的动力学拆分(KR)提供对映体富集的叔叠氮化物和溴化物。我们发现缺水对于获得高选择性因子至关重要。另一方面,新的实验观察和DFT建模使我们提出,通过动态动力学拆分(DKR)进行叔溴对映体的叠氮化。研究特别确定了碱和水在对映收敛过程中的关键作用,从而支持了在碱和水存在下通过SN 2X途径使叔溴化物异构化的提议。