A matter of catalyst: Azole compounds can be directly alkylated with N‐tosylhydrazones that bear unactivatedalkylgroups (see scheme; phen=1,10‐phenanthroline, Ts=p‐toluenesulfonyl). Nickel catalysis enables the introduction of simple secondary alkyl chains into benzoxazole compounds, whereas the alkylation of 5‐aryloxazoles and benzothiazole is possible by using a cobalt catalyst.
Copper-Catalyzed Alkylation of Benzoxazoles with Secondary Alkyl Halides
作者:Peng Ren、Isuf Salihu、Rosario Scopelliti、Xile Hu
DOI:10.1021/ol300348w
日期:2012.4.6
Copper-catalyzed direct alkylation of benzoxazoles using nonactivated secondary alkylhalides has been developed. The best catalyst is a new copper(I) complex (1), and the reactions are promoted by bis[2-(N,N-dimethylamino)ethyl] ether.