二齿吡啶甲酰胺(PA)导向基团可实现新的对映选择性钯(II)催化的胺的苄基CH芳基化反应。该反应提供了烷基胺对映选择性苄基γ-C-H芳基化的第一个实例,并以高达97%的ee进行。2,2'-二羟基-1,1'-联萘(BINOL)磷酸配体Cs 2 CO 3和无溶剂条件对于高对映选择性至关重要。机理研究表明,多个BINOL配体参与立体确定CH palpalation步骤。
二齿吡啶甲酰胺(PA)导向基团可实现新的对映选择性钯(II)催化的胺的苄基CH芳基化反应。该反应提供了烷基胺对映选择性苄基γ-C-H芳基化的第一个实例,并以高达97%的ee进行。2,2'-二羟基-1,1'-联萘(BINOL)磷酸配体Cs 2 CO 3和无溶剂条件对于高对映选择性至关重要。机理研究表明,多个BINOL配体参与立体确定CH palpalation步骤。
Scope and Limitations of Auxiliary-Assisted, Palladium-Catalyzed Arylation and Alkylation of sp<sup>2</sup> and sp<sup>3</sup> C–H Bonds
作者:Enrico T. Nadres、Gerson Ivan Franco Santos、Dmitry Shabashov、Olafs Daugulis
DOI:10.1021/jo4013628
日期:2013.10.4
auxiliary-assisted direct arylation and alkylation of sp2 and sp3 C–H bonds of amine and carboxylic acid derivatives has been investigated. The method employs a palladium acetate catalyst, substrate, aryl, alkyl, benzyl, or allyl halide, and inorganic base in tert-amyl alcohol or water solvent at 100–140 °C. Aryl and alkyl iodides as well as benzyl and allyl bromides are competent reagents in this transformation