Mesoporous Poly(melamine-formaldehyde): A Green and Recyclable Heterogeneous Organocatalyst for the Synthesis of Benzoxazoles and Benzothiazoles Using Dioxygen as Oxidant
作者:Daoshan Yang、Peng Liu、Ning Zhang、Wei Wei、Mingbo Yue、Jinmao You、Hua Wang
DOI:10.1002/cctc.201402628
日期:2014.12
simple, highly efficient, and sustainable strategy for the synthesis of benzoxazole and benzothiazole derivatives was developed by using inexpensive, green, readily available, and recyclable mesoporous poly(melamine–formaldehyde) as a green, heterogeneous organocatalyst. The corresponding substitutedbenzoxazoles and benzothiazoles were obtained in good to excellent yields by aerobicoxidation of o‐substituted
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
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.