The disclosure provides new and improved methods for the Pd-catalyzed asymmetric α-arylation of ester compounds, which produce the corresponding α-aryl moiety in high enantioselectivity (generally >90% ee). The present methods utilize a palladium catalyst supported by new (R)—H
8
-BINOL-derived monophosphine ligands. The method is applicable to a wide variety of aryl triflate substrates having variations in both electronic and steric properties. These aryl triflate substrates react with various α-alkyl (Z)- and/or (E)-0-trimethylsilyl ketene acetals in the presence of a Pd catalyst, (R)—H
8
-BINOL-derived monophosphine ligand, and a mild activator, for example, LiOAC, to provide the asymmetric α-arylation of ester compounds in high ee.
本公开提供了新的和改进的方法,用于Pd催化的
酯化合物的不对称α-芳基化,可产生相应的α-芳基基团,并具有高对映选择性(通常> 90% ee)。本方法利用由新(R)-H8-BINOL衍生的单
膦配体支持的
钯催化剂。该方法适用于具有电子和立体性质变化的各种芳基
三氟甲烷底物。这些芳基
三氟甲烷底物在Pd
催化剂,(R)-H8-BINOL衍生的单
膦配体和温和的活化剂(例如Li
OAC)存在下,与各种α-烷基(Z)-和/或(E)-0-三
甲基硅基乙
酮缩醛反应,从而提供高对映选择性的
酯化合物的不对称α-芳基化。