Monodentate Transient Directing Group Enabled Pd-Catalyzed <i>Ortho</i>-C–H Methoxylation and Chlorination of Benzaldehydes
作者:Feng Li、Yirong Zhou、Heng Yang、Ziqi Wang、Qinqin Yu、Fang-Lin Zhang
DOI:10.1021/acs.orglett.9b01158
日期:2019.5.17
We report Pd-catalyzed ortho-C–H methoxylation and chlorination of benzaldehydes by employing monodentate transient directing groups (TDGs) as an alternative strategy to bidentate TDGs. More importantly, a single crystal of benzaldehyde imine ortho-cyclopalladium intermediate was successfully obtained, and its structure was unambiguously determined by X-ray diffraction, which clearly showed that it
我们通过采用单齿瞬态导向基团(TDGs)作为二齿TDG的替代策略,报告了Pd催化的邻位C-H甲氧基化和苯甲醛的氯化。更重要的是,成功地获得了苯甲醛亚胺邻环钯中间体的单晶,并且通过X射线衍射明确地确定了其结构,这清楚地表明它是由吡啶酮配体桥接的双核钯物种。通过合成天然产物和药物的关键中间体,进一步证明了该方法的实用性。