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。
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。
Highly regioselective heterocyclization reactions of 1H-1,2,4-triazole-3-thiols with chloroacetylenephosphonates
作者:Elena B. Erkhitueva、Albina V. Dogadina、Andrey V. Khramchikhin、Boris I. Ionin
DOI:10.1016/j.tetlet.2012.05.157
日期:2012.8
acetonitrile with high regioselectivity to form the fused heterocycles, 6-(dialkoxyphosphoryl)-3H-thiazolo[3,2-b][1,2,4]triazol-7-ylium chlorides 1–5. A significant difference from the previously known reactions of binucleophiles with haloacetylenes is the involvement of both acetylenic carbon atoms in the heterocycle formation. A reaction mechanism is hypothesized that assumes the formation of a sulfenium
1-氯乙炔基-2-膦酸酯与1 H -1,2,4-三唑-3-硫醇在无水乙腈中具有较高的区域选择性,形成稠合的杂环6-(二烷氧基磷酰基)-3 H-噻唑并[3,2- b ] [1,2,4]三唑-7-鎓氯化物1 - 5。与双亲核试剂与卤代乙炔的先前已知反应的显着区别是两个炔属碳原子都参与了杂环的形成。假设反应机理假定乙炔C-1原子上形成a阳离子,然后C-2原子受到环N-2原子的攻击。化合物1 - 5容易地从二烷氧片段失去一个烷基,以形成两性离子(例如,6 - 8),其进一步可以转化成内盐9和10时,用浓盐酸加热。
Laser-induced twisting of phosphorus functionalized thiazolotriazole as a way of cholinesterase activity change
conformers via laser-induced phosphonategroup twisting. The reorganization of the PFT geometry was found to be a reason of butyrylcholinesterase inhibition mechanism change and the site-specificity loss. These results demonstrate that PFT combines photoswitching and bioactive properties in one molecule that makes it promising as a molecular basis for the further design of bioactive substances with