Palladium catalyzed asymmetric reactions assisted by P*,P*-bidentate bisdiamidophosphites based on 1,4-diols
作者:Konstantin N. Gavrilov、Sergey V. Zheglov、Vladislav K. Gavrilov、Marina G. Maksimova、Viktor A. Tafeenko、Vladimir V. Chernyshev、Kirill P. Birin、Igor S. Mikhel
DOI:10.1016/j.tet.2016.12.023
日期:2017.2
bisdiamidophosphite ligands containing 1,3,2-diazaphospholidine rings have been prepared. The cationic [Pd(allyl)(P*,P*)]BF4 and neutral [Pd(P*,P*)Cl2] palladium(II) complexes were synthesized with one of the new ligands. The use of these ligands provides up to 98% ee in Pd-catalyzed asymmetric allylations of (E)-1,3-diphenylallyl acetate, up to 72% ee in Pd-catalyzed asymmetric alkylation of cinnamyl acetate with
已经制备了含有1,3,2-二氮杂膦环的少量P *,P *-双齿二亚氨基亚磷酸酯配体。用一种新的配体合成了阳离子[Pd(烯丙基)(P *,P *)] BF 4和中性[Pd(P *,P *)Cl 2 ]钯(II)配合物。这些配体的使用在Pd催化的(E)-1,3-二苯基烯丙基乙酸酯的不对称烯丙基化中提供高达98%ee,在Pd催化的肉桂酸乙酸酯与2-氧代环己烷-1乙基的Pd催化不对称烷基化中提供高达72%ee -羧酸盐和高达94%ee的Pd催化N,N'-二甲苯基-内消旋异构化-环戊-4-烯-1,3-二醇双氨基甲酸酯。讨论了双二氨基亚磷酸酯桥联配体片段的性质对不对称诱导的影响。