Synthesis of trifluoromethylated 2-benzoyl- and 2-aminoimidazoles from ring rearrangement of 1,2,4-oxadiazole derivatives
作者:Antonio Palumbo Piccionello、Andrea Pace、Silvestre Buscemi、Nicolò Vivona、Marcella Pani
DOI:10.1016/j.tet.2008.02.047
日期:2008.4
Fluoroalkylated 2-ylamino-imidazoles have been synthesized by reaction of 3-amino-5-phenyl-1,2,4-oxadiazole with fluorinated beta-dicarbonyl compounds and subsequent base-induced Boulton-Katritzky Rearrangement (BKR) of the isolated beta-enaminocarbonyl intermediate. Alternatively, one-pot reactions performed in the presence of Montmorillonite K10 favoured the condensation at the 3-amino moiety of the oxadiazole and, in some cases, allowed the direct synthesis of 2-benzoylamino-imidazoles. Hydrolysis of 2-benzoylamino-imidazoles easily yielded fluorinated 2-amino-imidazoles targets. (c) 2008 Elsevier Ltd. All rights reserved.