A remarkable stereocontrol during cobalt(II) chloride catalysed opening of cinnamoyl epoxides with N-substituted anilines
作者:Asit De、Shubhajit Ghosh、Javed Iqbal
DOI:10.1016/s0040-4039(97)10171-x
日期:1997.12
The stereochemistry of the cobalt(II) chloride catalysed opening of cinnamoyl epoxides with N-substituted anilines is controlled by the para substituent of the aromatic ring attached to nitrogen atom. Thus the secondary amine having a para methoxy group cleaves the epoxide to afford the corresponding anti amino alcohol as the major product whereas amines containing para chloro, bromo, methyl or hydrogen
Synthesis of Substituted Oxindoles from α-Chloroacetanilides via Palladium-Catalyzed C−H Functionalization
作者:Edward J. Hennessy、Stephen L. Buchwald
DOI:10.1021/ja037546g
日期:2003.10.1
A novel method for the synthesis of oxindoles is described. In the presence of catalytic palladium acetate and 2-(di-tert-butylphosphino)biphenyl, α-chloroacetanilides are converted to oxindoles in good to excellent yields with high functional group compatibility using triethylamine as a stoichiometric base. The cyclization is highly regioselective, obviating the need for prefunctionalized arenes.