Activation of hydrocinnamic acids with pentafluorophenol versus pentafluorothiophenol: Reactivity towards hexylamine
作者:Fernanda M.F. Roleira、Fernanda Borges、Lourdes C.R. Andrade、José A. Paixão、Maria J.M. Almeida、Rui A. Carvalho、Elisiário J. Tavares da Silva
DOI:10.1016/j.jfluchem.2008.09.013
日期:2009.2
In this work we describe and compare the synthesis of four new hexylamides of hydrocinnamic acids, namely hexylamide of hydrocinnamic, 3,4-dimethoxyhydrocinnamic, 4-hydroxy-3-methoxyhydrocinnamic and 3,4-dihydroxyhydrocinnamic acids via pentafluorophenyl esters (PFPEs) versus pentafluorophenyl thioesters (PFPTs) intermediates. It was found that the PRE are the best intermediates for this kind of synthesis giving reactions with less by products, easier work-up, higher overall yields and with the best reactivity towards hexylamine. The X-ray structures of two PRE are also reported. (C) 2008 Elsevier B.V. All rights reserved.
Efficient Synthesis of Thioesters and Amides from Aldehydes by Using an Intermolecular Radical Reaction in Water
作者:Hisanori Nambu、Kayoko Hata、Masato Matsugi、Yasuyuki Kita
DOI:10.1002/chem.200400754
日期:2005.1.7
(VA-044) and the surfactant, cetyltrimethyl-ammonium bromide (CTAB), was found to be the most suitable condition for the effective and direct synthesis of useful active thioesters (pentafluorophenyl thioesters) in water. In addition, the direct amidation of aldehydes was achieved by the addition of the amines to the thioesterification reaction mixture in water.
The direct synthesis of thioesters using an intermolecular radical reaction of aldehydes with dipentafluorophenyl disulfide in water
作者:Hisanori Nambu、Kayoko Hata、Masato Matsugi、Yasuyuki Kita
DOI:10.1039/b202129c
日期:2002.5.9
The combination of the water-soluble radical initiator, 2,2'-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (VA-044), and surfactant, cetyltrimethylammonium bromide (CTAB), was found to be the most suitable condition for the effective direct synthesis of useful active thioesters (pentafluorophenyl thioesters) in water.