Chiral-Anion-Dependent Inversion of Diastereo- and Enantioselectivity in Carbonyl Crotylation via Ruthenium-Catalyzed Butadiene Hydrohydroxyalkylation
作者:Emma L. McInturff、Eiji Yamaguchi、Michael J. Krische
DOI:10.1021/ja311208a
日期:2012.12.26
The ruthenium catalyst generated in situ from H(2)Ru(CO)(PPh(3))(3), (S)-SEGPHOS, and a TADDOL-derived phosphoric acid promotes butadiene hydrohydroxyalkylation to form enantiomerically enriched products. Notably, the observed diastereo- and enantioselectivity is the opposite of that observed using BINOL-derived phosphate counterions in combination with (S)-SEGPHOS, the same enantiomer of the chiral
从 H(2)Ru(CO)(PPh(3))(3)、(S)-SEGPHOS 和 TADDOL 衍生的磷酸原位生成的钌催化剂促进丁二烯氢羟基烷基化以形成对映体富集的产品。值得注意的是,观察到的非对映选择性和对映选择性与使用 BINOL 衍生的磷酸盐抗衡离子与 (S)-SEGPHOS(手性配体的相同对映体)组合观察到的相反。描述了手性配体和手性 TADDOL-磷酸盐反离子之间的匹配/错配效应。首次报道了手性磷酸盐抗衡离子修饰的钌配合物的单晶 X 射线衍射数据。