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51.
E. B. Erkhitueva A. V. Dogadina A. V. Khramchikhin B. I. Ionin 《Russian Journal of Organic Chemistry》2013,49(4):580-590
Chloroethynylphosphonates reacted with 4H-1,2,4-triazole-3-thiols in anhydrous acetonitrile to afford fused heterocyclic compounds, 6-(dialkoxyphosphoryl)-3H-thiazolo[3,2-b][1,2,4]triazol-7-ium chlorides, with high regioselectivity. The products were converted into inner salts (zwitterions) of the corresponding phosphonic acids or their monoesters with the positive charge localized on N7. A probable reaction mechanism implies initial formation of sulfonium ion via attack by the thionic sulfur atom on the acetylenic carbon atom linked to chlorine, followed by intramolecular cyclization involving attack on the other acetylenic carbon atom by N2 of the triazole ring. 相似文献
52.
N. I. Svintsitskaya O. A. Aimakov A. V. Dogadina B. I. Ionin 《Russian Journal of General Chemistry》2009,79(7):1461-1466
A new phosphorylated ynamine, dimethyl anabasylethynephosphonate, was synthesized by reaction of dimethyl chloroacetylenephosphonate
with anabasine. Anabasylethynephosphonate obtained was shown to react under mild conditions with primary aromatic amines like
p-chloroaniline, p-anisidine, and p-aminoacetophenone, whose pK
b values are in the range of 9–13, to form new asymmetrical phosphorylated acetamidines in high yields. Structure of the compounds
obtained was proved by 1H, 13C, and 31P NMR spectroscopy. 相似文献