Enantioselective Imine Reduction Catalyzed by Phosphenium Ions
作者:Travis Lundrigan、Erin N. Welsh、Toren Hynes、Chieh-Hung Tien、Matt R. Adams、Kayelani R. Roy、Katherine N. Robertson、Alexander W. H. Speed
DOI:10.1021/jacs.9b07293
日期:2019.9.11
The first use of phosphenium cations in asymmetric catalysis is reported. A diazaphosphenium triflate, prepared in two or three steps on a multi-gram scale from commercially available materials catalyzes the hydroboration or hydrosilation of cyclic imines with enantiomeric ratios of up to 97:3. Catalyst loadings are as low as 0.2 mole percent. Twenty-two aryl/heteroaryl pyrrolidines and piperidines
A method of treating a pediatric cancer in a subject in need thereof. The method includes administering to the subject a therapeutically effective amount of (S)—N-(5-((R)-2-(2,5-difluorophenyl)pyrrolidin-1-yl)-pyrazolo[1,5-a]pyrimidin-3-yl)-3-hydroxypyrrolidine-1-carboxamide, or a pharmaceutically acceptable salt thereof, or a combination thereof.
An efficientpreparation 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%。