作者:E. N. Kozminykh、N. M. Igidov、G. A. Shavkunova、V. O. Kozminykh
DOI:10.1007/bf02495929
日期:1997.7
2-p-Chlorobenzoylmethylene-5-phenyl-2,3-dihydro-3-furanone reacts with arylamines or N-arylideneamines to form the products of ring opening, 1,6-diaryl-1-arylamino-4-hydroxy-1,4-hexadiene-3,6-diones. The reaction of 5-aryl-2-p-chlorobenzoylmethylene-2,3-dihydro-3-furanones with o-aminophenol afforded 3-p-chlorobenzoylmethylene-3,4-dihydro-2H-benzo[b]-1,4-oxazin-2-one. Nucleophilic attack of amines is directed either to electrophilic centers at the C(5) and C(2) atoms or to the carbonyl group of the 2-phenacylidene substituent of the 3-oxofuran ring.
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作者:E. S. Berezina、V. O. Koz'minykh、N. M. Igidov、S. S. Shirinkina、E. N. Koz'minykh、R. R. Makhmudov、E. V. Bukanova
DOI:10.1023/a:1012486020067
日期:——
Pivaloylpyruvamides were obtained by reaction of pivaloylpyruvic acid with ammonia, primary and secondary amines. The amides in solutions exist as an equilibrium tautomeric mixture of ketoenol and minor beta -diketone forms. The pivaloylpyruvamides under mild conditions react with benzylamine or arylamines to furnish products of substitution at the alpha -carbonyl group, the corresponding amides of (Z)-2-benzylamino- or 2-arylamino-5,5-dimethyl-4-oxo-2-hexenoic acid. The latter also exist in solutions as two tautomers. The amides synthesized possess a biological activity.
Pivaloylpyruvic acid as a new acylating reagent for amines
作者:V. O. Koz'minykh、N. M. Igidov、E. S. Berezina、E. N. Koz'minykh、Yu. S. Kasatkina
DOI:10.1007/bf02495160
日期:2000.9
Pivaloylpyruvic acid is an efficient reagent for preparative acylation of amines. A method for the synthesis of substituted pivaloylpyruvamides with domination of (Z)-β-keto-enol tautomer is proposed. The structure of pivaloylpyruvic acid and its amides, as well as the specific features of the reaction of pivaloylpyruvic acid with amines, are discussed.