Fluorinated enones were reacted with thiazoles, imidazoles, benzimidazoles and benzthiazoles bearing methylene groups activated by electron-withdrawing substituents. The reactions start with a nucleophilic attack of the methylene carbon on the β-position of the enones. If the starting methylene compound contains a thi-azole ring, pyrones or pyridones were formed due to participation of the ester or
A Convenient Synthesis and Chemical Properties of 3-Acylamino-6-polyfluoroalkyl-2<i>H</i>-pyran-2-ones
作者:Igor I. Gerus、Günter Haufe、Nataliya A. Tolmachova、Sergey I. Vdovenko、Roland Fröhlich
DOI:10.1055/s-2005-865290
日期:——
A number of 3-acylamino-6-polyfluoroalkyl-2H-pyran-2-ones 3 were synthesized from β-alkoxyvinyl polyfluoroalkyl ketones 1 and N-acylglycines 2 in acetic anhydride in high yield. The reactions of trifluoromethyl-containing 2H-pyran-2-one 3b with O- and N-nucleophiles were studied and 3-N-benzoylamino-6-hydroxy-6-trifluoromethyl-5,6-dihydro-2H-pyran-2-one (13), 3-N-benzoylamino-6-hydroxy-6-trifluoromethyl-5,6-dihydro-2H-pyridin-2-one (14a), and N- and O-substituted 3-(N-benzoylamino)-6-trifluoromethyl-2H-pyridin-2-ones (15c,e, and 16) were synthesized.