Application of phosphinous amide ligands in palladium complex-catalyzed asymmetric allylic alkylation: influence of steric effects on enantioselectivity
作者:Xuanhua Chen、Rongwei Guo、Yueming Li、Gang Chen、Chi-Hung Yeung、Albert S.C. Chan
DOI:10.1016/j.tetasy.2003.10.039
日期:2004.1
Phosphinous amide ligands 1–4 derived from 2,2′-diamino-1,1′-binaphthyl (BINAM) and 2,2′-diamino-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl (H8-BINAM) have been prepared and applied in palladium complex-catalyzed asymmetric allylic alkylations. The alkylations of racemic 1,3-diphenyl-2-propenyl acetate with malonate, α-substituted malonates or acetylacetone catalyzed by the palladium complexes bearing
膦配体酰胺1 - 4由2,2-衍生' -二氨基-1,1 '联萘(BINAM)和2,2- '二氨基-5,5 ',6,6 ',7,7 ',8,8 ' -八氢- 1,1 '联萘(H 8 -BINAM)已经被制备和钯配合物催化的不对称烯丙位烷基化应用。外消旋的1,3-二苯基-2-丙烯基乙酸酯与丙二酸酯,α-取代的丙二酸酯或乙酰丙酮的烷基化反应由带有这些配体的钯配合物催化,可以得到高达96%ee的产物。