Polyfluoroheterocyclic compounds. Part XVIII. Reactions of heptafluoro-quinoline and -isoquinoline and pentafluoropyridine with hydrogen halides
作者:R. D. Chambers、M. Hole、W. K. R. Musgrave、J. G. Thorpe
DOI:10.1039/j39710000061
日期:——
When pentafluoropyridine and heptafluoro-quinoline and -isoquinoline react with hydrogen halides in tetrahydro-thiophen dioxide, replacement of fluorine ortho and para to ring nitrogen by the other halogen occurs. The order of reactivity is heptafluoroquinoline ⋙ heptafluoroisoquinoline > pentafluoropyridine. Reaction with heptafluoro-quinoline occurs at room temperature with substitution first at
当五氟吡啶和七氟喹啉和-异喹啉在四氢噻吩二氧化物中与卤化氢反应时,取代氟邻位和对位通过另一个卤素使氮环化。反应顺序为七氟喹啉⋙七氟异喹啉>五氟吡啶。与七氟喹啉的反应在室温下发生,首先在2-位取代,然后在4-位取代,可以直接获得良好的2,4-二卤代衍生物收率。与五氟吡啶和七氟异喹啉的反应需要升高温度。五氟吡啶以低收率得到4-和2,4,6-取代的衍生物,而七氟异喹啉为1-取代的衍生物。发现溶剂中存在少量水会使系统失活。从质子化物种中氟离子的亲核取代方面讨论了这些反应的机理。