Regiochemistry of nucleophilic substitution of pentachloropyridine with N and O bidentate nucleophiles
作者:Alireza Poorfreidoni、Reza Ranjbar-Karimi、Reza Kia
DOI:10.1039/c5nj00418g
日期:——
Site reactivity of some enol–imines derived from N-aryl formamides with pentachloropyridine under basic conditions in dry CH3CN was investigated. The aromatic nucleophilic substitution of pentachloropyridine with enol–imines occurs at the 4-position of pyridine ring by both oxygen and nitrogen site of enol–imines. Nucleophilic attack by the oxygen of enol–imine gave corresponding oximino compounds
在碱性条件下,在干燥的CH 3 CN中,研究了一些N-芳基甲酰胺衍生的烯醇-亚胺与五氯吡啶的位点反应性。五氯吡啶被烯醇-亚胺的芳香亲核取代发生在吡啶环的4位,同时被烯醇-亚胺的氧和氮位置所取代。烯醇-亚胺氧的亲核攻击产生了相应的肟基化合物,这些化合物是E-和Z-异构体的混合物。相反,烯醇-亚胺氮的亲核攻击产生了意想不到的N,N-二取代芳基化合物。所有化合物的结构通过IR,1 H NMR,13 C NMR和19 F NMR光谱以及元素分析和X射线晶体学。