作者:Reza Ranjbar-Karimi、Alireza Poorfreidoni、Hamid Reza Masoodi
DOI:10.1016/j.jfluchem.2015.10.008
日期:2015.12
Chemo selectivity of some N-aryl formamides with pentafluoropyridine under basic conditions in dry THF was investigated. The aromatic nucleophilic substitution of pentafluoropyridine with enol–imines derived from N-aryl formamides occurs at the 4-position of pyridine ring by both oxygen and nitrogen site of enol–imines depending on the nature of the aromatic ring substituent; with electron releasing
研究了碱性条件下,在干燥的THF中,一些N-芳基甲酰胺与五氟吡啶的化学选择性。五氟吡啶被N-芳基甲酰胺衍生的烯醇-亚胺芳族亲核取代发生在吡啶环的4-位,烯醇-亚胺的氧和氮位均取决于芳香环取代基的性质。在带有电子释放基团的情况下,亲核进攻是通过氧原子完成的;在带有吸电子基团的情况下,N-芳基甲酰胺阴离子与五氟吡啶的反应是通过氮位进行的。