Regioselectivity of the reaction of 4H-1,2,4-triazole-3-thiol derivatives with chloroethynylphosphonates and structure of the products
作者:E. B. Erkhitueva、A. V. Dogadina、A. V. Khramchikhin、B. I. Ionin
DOI:10.1134/s1070428013040155
日期:2013.4
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
氯乙炔基膦酸酯与4 H -1,2,4-三唑-3-硫醇在无水乙腈中反应,得到稠合的杂环化合物6-(二烷氧基磷酰基)-3 H-噻唑并[3,2- b ] [1,2,4]三唑7-氯化铵,具有很高的区域选择性。将产物转化为相应的膦酸或其单酯的内盐(两性离子),其中正电荷位于N 7上。可能的反应机理是通过via硫原子在与氯连接的炔属碳原子上的进攻,然后通过三唑环的N 2进攻另一个炔属碳原子的分子内环化作用,初步形成of离子。