Matsuda–Heck arylation of itaconates: a versatile approach to heterocycles from a renewable resource
作者:Andreas Krause、Eric Sperlich、Bernd Schmidt
DOI:10.1039/d1ob00392e
日期:——
Itaconic acid esters and hemiesters undergo Pd-catalyzed coupling reactions with arene diazoniumsalts in high to excellent yields. The coupling products of ortho-nitro arene diazoniumsalts can be converted in one or two steps to benzazepine-2-ones.
Sandmeyer Trifluoromethylation of Arenediazonium Tetrafluoroborates
作者:Grégory Danoun、Bilguun Bayarmagnai、Matthias F. Grünberg、Lukas J. Gooßen
DOI:10.1002/anie.201304276
日期:2013.7.29
trifluoromethyl derivatives in the presence of a trifluoromethyl–copper complex generated in situ from CuSCN and the inexpensive, easy‐to‐use trifluoromethylating reagent Me3Si‐CF3 (see scheme). This Sandmeyer‐type reaction allows the straightforward synthesis of trifluoromethylated arenes and heteroarenes from the corresponding amines.
A visible-light RuII photoredox Meerwein synthesis of isochromanones and isochromenones is described starting from diazonium salts of differently substituted anthranilic acids and various alkenes. This approach has allowed the reliable and efficient preparation of structures found in many biologically active molecules or used in materials chemistry.
Expeditious synthesis of 3,4-dihydroisocoumarins and phthalides using the Heck–Matsuda reaction
作者:Eduardo T. da Penha、José Augusto Forni、André F.P. Biajoli、Carlos Roque D. Correia
DOI:10.1016/j.tetlet.2011.09.014
日期:2011.11
Several 3,4-dihydroisocoumarins and phthalides were synthesized by an effective Heck-Matsuda reaction involving an ortho carboxybenzenediazonium salt with a series of styrenes bearing electron donating and electron withdrawing groups, methylvinyl ketone, and methyl acrylate. The reaction was carried out in an open-flask with 1% mol of palladium acetate in aqueous ethanol at similar to 80 degrees C, giving the correspondent 3-aryl-3,4-dihydroisocoumarins and phthalides with good overall yields. The electronic nature of the group attached to the olefin is a key feature for the regioselectivity of the cyclization step. (C) 2011 Elsevier Ltd. All rights reserved.
Synthese nouvelle et rapide d'alkylseleno et alkyltelluroarenes au moyen d'ethers-couronnes