Pd-Catalyzed <i>Ortho</i> C–H Hydroxylation of Benzaldehydes Using a Transient Directing Group
作者:Xiao-Yang Chen、Seyma Ozturk、Erik J. Sorensen
DOI:10.1021/acs.orglett.7b02906
日期:2017.12.1
The direct Pd-catalyzed ortho C–H hydroxylation of benzaldehydes was achieved using 4-chloroanthranilic acid as the transient directing group, 1-fluoro-2,4,6-trimethylpyridnium triflate as the bystanding oxidant, and p-toluenesulfonic acid as the putative oxygen nucleophile. The unusual C–H chlorination and polyfluoroalkoxylation reactions signaled the importance of external nucleophiles to the outcome
苯甲醛的直接Pd催化邻位C–H羟基化反应是通过使用4-氯邻氨基苯甲酸作为瞬态导向基团,1-氟-2,4,6-三甲基吡啶鎓三氟甲磺酸作为独立的氧化剂和对甲苯磺酸作为推定的氧亲核试剂。不寻常的C–H氯化和多氟烷氧基化反应表明外部亲核试剂对Pd(IV)还原消除结果的重要性。