A tandem palladium-catalyzed Heck-lactonization through the reaction of ortho-iodophenols with β-substituted acrylates: synthesis of 4,6-substituted coumarins
作者:Talita de A. Fernandes、Rita de C.C. Carvalho、Tatiana M.D. Gonçalves、Alcides J.M. da Silva、Paulo R.R. Costa
DOI:10.1016/j.tetlet.2008.03.037
日期:2008.5
Coumarins were obtained in one pot through a palladium-catalyzed Heck-lactonization reaction involving ortho-iodophenols and methyl crotonate or a Z-enoate derived from D-mannitol. These reactions were investigated under different conditions and palladium sources. In the more interesting cases, coumarins were prepared in water, using triethylamine as base and I mol % of PdCl2 as catalyst. (c) 2008 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Tandem Heck-Lactonization from <i>o</i>-Iodophenols and Enoates: Synthesis of Coumarins and the Study of the Mechanism by Electrospray Ionization Mass Spectrometry
作者:Talita de A. Fernandes、Boniek Gontijo Vaz、Marcos N. Eberlin、Alcides J. M. da Silva、Paulo R. R. Costa
DOI:10.1021/jo1010922
日期:2010.11.5
and B). Using electrosprayionization for transferring ions directly from solution to the gasphase, and massspectrometry for structural assignments, key cationic palladium intermediates have been successfully intercepted and structurally characterized for the first time for this type of reaction.