Cyclopalladated Ferrocenylimine Catalyzed Chlorination of 2-Arylbenzoxazoles
作者:Yuting Leng、Fan Yang、Yangjie Wu、Ke Li
DOI:10.1002/cjoc.201180245
日期:2011.8
An efficient and facile protocol for palladacycle‐catalyzedchlorination of 2‐arylbenzoxazoles was developed. The results represent the first examples involving the palladacycle as the catalyst for such chlorination. This chlorination was not a ligand‐directed ortho‐CH activation, but an electrophilic substitution process at the para‐position of the nitrogen atom in the benzo ring of benzoxazole moiety
Site-selective Suzuki–Miyaura reactions of 2,6-dichlorobenzoxazole
作者:Aws M. Hamdy、Nadi Eleya、Hamid H. Mohammed、Tamás Patonay、Anke Spannenberg、Peter Langer
DOI:10.1016/j.tet.2012.11.021
日期:2013.2
Suzuki-Miyaura reactions of 2,6-dichlorobenzoxazole provide a convenient access to arylated benzoxazoles. The reactions proceed with excellent site-selectivity in favour of position 2, due to electronic reasons. (c) 2012 Elsevier Ltd. All rights reserved.
Chlorination and ortho-acetoxylation of 2-arylbenzoxazoles
作者:Yuting Leng、Fan Yang、Weiguo Zhu、Yangjie Wu、Xiang Li
DOI:10.1039/c1ob05223c
日期:——
Efficient and facile catalytic protocols for chlorination and ligand-directed ortho-acetoxylation of 2-arylbenzoxazoles have been developed. The chlorination is not a ligand-directed ortho-functionalization, but an electrophilic substitution process in the benzo ring of the benzoxazole moiety. Meanwhile, the acetoxylation exhibited high regioselectivity for the substrates containing a meta-substituent and occurred at the less sterically hindered ortho-C–H bond of the directing group.