Synthesis of pyridine derivatives by reactions of ?,?-unsaturated nitriles with 2-oxo-cycloalkano carbothioic acid anilides
摘要:
The tandem Michael addition-cyclization of 2-oxo-cycloalkane carbothioic acid anilides 1-3 to benzylidenemalononitrile 4 yielded spiroannulated pyridines 5-7. Reaction of acrylonitrile with 2 and 3 gave 2,2-disubstituted Michael adducts 14, 15, whereas with 1 led to 2,2,5-tri(2-cyanoethyl)-cyclopentanone 11.
Synthesis of Functionalized Spiro[cycloalkanono-2,3?-thiophenes] via Tandem Conjugate Addition-Cyclization of 3-Oxoacid Thioanilides to Nitroalkenes
作者:Krystyna Bogdanowicz-Szwed、Regina Gil
DOI:10.1007/s00706-004-0185-7
日期:2004.11
A convenient method is described for the synthesis of functionalized spiro[cycloalkanono-2,3′-thiophenes] by treatment of cyclic 3-oxoacid thioanilides with β-nitrostyrenes. Reaction of the obtained products with acetic anhydride yielded the corresponding oxime acetates.
Synthesis of sulfanylidene-diazaspirocycloalkanones in a three-component Mannich-type reaction catalyzed with lactic acid
作者:Tadeusz Stefan Jagodziński、Jacek Grzegorz Sośnicki、Łukasz Struk
DOI:10.24820/ark.5550190.p010.136
日期:——
general reaction. Spirohexahydropyrimidines were obtained in the one-pot, three-componentreaction of a variety of cyclic-ketone-derived thioamides, primary amines and formaldehyde with lactic acid acting as a catalyst. The results of our experiments confirmed the high catalytic efficiency of lactic acid. A proper choice of the starting thioamides and amines makes it possible to use this reaction methodolgy