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.