作者:Sunisa Akkarasamiyo、Supaporn Sawadjoon、Andreas Orthaber、Joseph S. M. Samec
DOI:10.1002/chem.201705164
日期:2018.3.7
Palladium‐catalyzed allylic substitution of non‐derivatized enantioenriched allylic alcohols with a variety of uncharged N‐, S‐, C‐ and O‐centered nucleophiles using a bidentate BiPhePhos ligand is described. A remarkable effect of the counter ion (X) of the XPd[κ2‐BiPhePhos][η3‐C3H5] was observed. When ClPd[κ2‐BiPhePhos][η3‐C3H5] (complex I) was used as catalyst, non‐reproducible results were obtained
描述了使用双齿BiPhePhos配体用各种不带电荷的N-,S-,C-和O-中心的亲核试剂对非衍生化对映体富集的烯丙醇进行钯催化的烯丙基取代。所述XPD [κ的抗衡离子(X)的一个显着的效果2 [η-BiPhePhos] 3 -C 3 H ^ 5 ]进行了观察。当CLPD [κ 2 -BiPhePhos] [η 3 -C 3 H ^ 5 ](络合物 我)作为催化剂,得到的非可重复的结果。通过X射线晶体学研究络合物,31P NMR光谱,和ESI-MS显示发生了分解,其中亚磷酸酯配体的一种被氧化成相应的磷酸盐,产生CLPD [κ 1 -BiPhePhosphite磷酸] [η 3 -C 3 H ^ 5 ]种类(复合 II) 。当氯化物被交换成较弱的协调光学传递函数-离子更稳定的计数器的Pd [κ 2 -BiPhePhos] [η 3 -C 3 H ^ 5 ] + + [光学传递函数] - (络合