Room-temperature Pd-catalyzed C–H chlorination by weak coordination: one-pot synthesis of 2-chlorophenols with excellent regioselectivity
作者:Xiuyun Sun、Yonghui Sun、Chao Zhang、Yu Rao
DOI:10.1039/c3cc47431c
日期:——
A room-temperature Pd(II)-catalyzed regioselective chlorination reaction has been developed for a facile one-pot synthesis of a broad range of 2-chlorophenols. The reaction demonstrates an excellent regioselectivity and reactivity for CâH chlorination. This reaction represents one of the rare examples of mild CâH functionalization at ambient temperature.
Palladium-catalysed ortho-arylation of carbamate-protected phenols
作者:Robin B. Bedford、Ruth L. Webster、Charlotte J. Mitchell
DOI:10.1039/b916724m
日期:——
The carbamate (–O2CNR2) function is an excellent directing group for palladium-catalysed direct arylation reactions giving both protected or free mono- or di-substituted phenols, as well as an example of a dibenzopyranone, depending on coupling partners (aryl iodides or diaryliodonium salts) and conditions.
Mixing <i>O</i>-Containing and <i>N</i>-Containing Directing Groups for C–H Activation: A Strategy for the Synthesis of Highly Functionalized 2,2′-Biaryls
N-containing directing groups has been developed for the synthesis of 2,2′-biaryl via Pd-mediated C–Hbond activation and oxidative coupling. This new transformation may proceed through a mechanism involving Pd(II) and Pd(IV) intermediates. We found the use of PTSA and HFIP to be critical for the reaction and suggest that these reagents could serve as efficient ligands for this C–Cbond formation. This
Regio- and Stereoselective Olefination of Phenol Carbamates through C-H Bond Functionalization
作者:Bin Li、Jianfeng Ma、Yujie Liang、Nuancheng Wang、Shansheng Xu、Haibin Song、Baiquan Wang
DOI:10.1002/ejoc.201201574
日期:2013.4
ortho-olefinated phenol carbamate, including a ruthenium(II)-catalyzed oxidative olefination of phenol carbamate with acrylates and a rhodium(III)-catalyzedalkynehydroarylation of phenol carbamate with internal alkynes through direct C–H activation, are reported. Both reactions afford substituted alkenes in a highly regio- and stereoselective manner.
可用于获得邻位烯烃化苯酚氨基甲酸酯的两种途径,包括钌 (II) 催化的苯酚氨基甲酸酯与丙烯酸酯的氧化烯烃化和铑 (III) 催化的苯酚氨基甲酸酯与内部炔烃通过直接 C-H 的炔烃加氢芳基化激活,报告。这两个反应都以高度区域和立体选择性的方式提供取代的烯烃。
Infrared spectra and transmission of electronic effects in substituted phenyl N,N-dimethylcarbamates and S-phenyl N,N-dimethylthiocarbamates
作者:Alexander Perjessy、Ronald G. Jones、Susan L. McClair、Joyce M. Wilkins