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
Synthesis and Properties of β-Ethoxyvinyl Polyfluoroalkyl Ketones
作者:Marine G. Gorbunova、Igor I. Gerus、Valery P. Kukhar
DOI:10.1055/s-2000-6386
日期:——
A number of β-ethoxyvinyl polyfluoroalkyl ketones were synthesized by acylation of ethyl vinyl ether with acid chlorides containing polyfluoroalkyl groups of different composition and structure. Some typical nucleophilic reactions of the title compounds with amines were carried out. Two new fluoro-containing pyrimidinoles were synthesized by the reaction of β-ethoxyvinyl polyfluoroalkyl ketones with urea.
The invention relates to compounds of the general formula (I),
in which the radicals A
1
, A
2
, A
3
, A
4
, Lm, Q, R
1
, T and U have the meaning given in the description and to the use of the compounds for controlling animal pests. In addition, the invention relates to processes and intermediates for the preparation of the compounds according to formula (I).
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.
The reaction of 2-aminothiazol-4(5H)-iminium salts with various 1,3-CCC-dielectrophiles was investigated. As a result, a set of diverse thiazolo[4,5-d]pyridines were obtained. The scope and limitation of the approach is described.