Expeditious Synthesis of Phenanthrenes via CuBr<sub>2</sub>-Catalyzed Coupling of Terminal Alkynes and <i>N-</i>Tosylhydrazones Derived from <i>O</i>-Formyl Biphenyls
作者:Fei Ye、Yi Shi、Lei Zhou、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1021/ol201788v
日期:2011.10.7
A new method for the synthesis of phenanthrenes via ligand-free CuBr2-catalyzed coupling/cyclization of terminal alkynes with N-tosylhydrazones derived from o-formyl biphenyls has been developed. This new synthesis has wide range of functional group compatibility.
Synthesis of Phenanthrenes through Copper-Catalyzed Cross-Coupling of <i>N</i>-Tosylhydrazones with Terminal Alkynes
作者:Mohammad Lokman Hossain、Fei Ye、Zhenxing Liu、Ying Xia、Yi Shi、Lei Zhou、Yan Zhang、Jianbo Wang
DOI:10.1021/jo501489c
日期:2014.9.19
for the synthesis of phenanthrenes through the copper-catalyzed reaction of aromatic tosylhydrazones with terminalalkynes is explored. The reaction proceeds via the formation of an allene intermediate and subsequent six-π-electron cyclization–isomerization, affording phenanthrene derivatives in good yields. The transformation can be performed in two ways: (1) with N-tosylhydrazones derived from [1,1