Efficient preparation of (
<i>R</i>
)‐2‐(2,5‐difluorophenyl)pyrrolidine via a recycle process of resolution
作者:Xunlei Lv、Liang Chen、Jing Pan、Xue Meng、Siju Bi、Weiyuan Liu、Ting Zhou、Kuaile Lin、Deyong Ye、Weicheng Zhou
DOI:10.1002/chir.23366
日期:2021.12
An efficient preparation of (R)-2-(2,5-difluorophenyl)pyrrolidine ((R)-1) from the racemate based on a recycle process of resolution/racemization was described. In the process, the desired (R)-1 was obtained by resolution with D-malic acid in 95% EtOH. Meanwhile, the undesired (S)-1 could be racemized in the presence of potassium hydroxide in DMSO. After three times of recycle process, the desired
描述了基于拆分/外消旋化的循环过程从外消旋体有效制备 ( R )-2-(2,5-二氟苯基)吡咯烷 (( R ) -1 )。在该过程中,通过在 95% EtOH中用D-苹果酸拆分获得所需的 ( R ) -1。同时,在氢氧化钾的 DMSO 中,不需要的 ( S ) -1可以外消旋。经过3次循环后,以61.7%的收率获得了所需的游离碱(R)-1,ee值高达98.4%。