5543-33-9Relevant academic research and scientific papers
Construction of 3,5-substituted 1,2,4-oxadiazole rings triggered by tetrabutylammonium hydroxide: A highly efficient and fluoride-free ring closure reaction of O-acylamidoximes
Otaka, Hiromichi,Ikeda, Junya,Tanaka, Daisuke,Tobe, Masanori
, p. 979 - 981 (2014/02/14)
Tetrabutylammonium hydroxide (TBAH) is an efficient and mild alternative to tetrabutylammonium fluoride (TBAF) for base catalyzed cyclizations of 1,2,4-oxadiazoles from O-acylamidoximes. For most 3,5-substituted 1,2,4-oxadiazoles the reactions were dramatically accelerated by addition of 0.1 equiv of TBAH at room temperature. This method was also more generally applicable allowing for a wider range of substrates. Additionally, due to the absence of fluoride, TBAH will not result in corrosion of reactor vessels and therefore is better suited for large-scale synthesis.
One-step protection-free synthesis of 3-aryl-5-hydroxyalkyl-1,2,4- oxadiazoles as building blocks
Neves Filho, Ricardo A. W.,Da Silva-Alves, Diana C. B.,Dos Anjos, Janaina V.,Srivastava, Rajendra M.
supporting information, p. 2596 - 2602 (2013/07/26)
A simple and straightforward synthesis of 3-aryl-5-hydroxyalkyl-1,2,4- oxadiazoles is described. The reaction among arylamidoximes, ethyl glycolate or ethyl lactate, and potassium carbonate in refluxing toluene afforded the desired 1,2,4-oxadiazoles in moderate to good yields. The synthesis has been accomplished in a single step, avoiding protection-deprotection protocols. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications to view the free supplemental file.
