Nous avons poursuivi I'Ctude de la rkaction de certains sels sodCs de dCrivCs de I'acide amino-3-cyano-2-thioacrylique avec des dCrivCs halogCnCs. L'action de mtthylcCtones a-halogCnCes a permis d'obtenir dans certaines conditions soit des dCrives d'acide acyl-5-diamino-2,4-thiophene-3-carboxylique soit des ddrives d'acide thiazoline-Axadtique. L'acttylation de certains thiophenes a conduit i la formation de thienopyrimidines.Reactions of sodium salts of substituted 3-amino-2-cyano-3-thioacrylic esters and amides with ahalomethylketones were studied. Conditions were found which led to the synthesis of either 5-acyl-2,4-diaminothiophene-3-carboxylic esters and amides or thiazoline-A'=-acetic esters and amides. Some thiophene-3-carboxamides were also transformed into thienopyrimidines upon acetylation.
R e p le 1 dkcembre, 1970 La reaction des dCrivCs sod& d'hydrazides des acides amino-3 cyano-2 rnercapto-3 acryliques avec certains dCrivCs halogCnCs a donnC des dCrivCs irnino-4 thiophknes stables que nous avons caracterisis I'i.r., a I1u.v., et au r.rn.n.Reaction between sodium salts of 3-amino-2-cyano-3-rnercapto acrylhydrazides and two halocornpounds resulted in the formation of some 4-iminothiophenes that were found to be quite stable. Their i.r., u.v., and n.m.r. spectra are described here together with one of their tautomeric forms obtained after acetylation.
Die in situ aus den Cyanessigsäureestern und ‐amiden (I) mit den Isothiocyanaten (II) gebildeten Na‐Salze (III) von Mercaptoacrylsäurederivaten reagieren mit den α‐Halogenmethylketonen (IV) in Abhängigkeit von den Reaktionsbedingungen und der Art der Substituenten zu den Thiazolin‐ (V) oder Thiophen‐Derivaten (VI); z.B. entstehen bei niedrigen Temperaturen eher Thiophene (VI) (30‐80% Ausbeute), bei höheren Temperaturen eher Thiazoline (V) (40 bis 75%).
Die Reaktion des Isothiocyanats (I) mit den Säurehydraziden (II) in Gegenwart von Na‐äthylat/Äthanol führt zu den Mercaptoderivaten (III), die in situ mit dem Bromketon (IV) in siedendem Äthanol die Iminothiophene (V) (45‐55% Ausbeute) liefern.
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