Synthesis of 2-Heptyl-1-hydroxy-4(1<i>H</i>)-quinolone - Unexpected Rearrangement of 4-(Alkoxycarbonyloxy)quinoline <i>N</i>-Oxides to 1-(Alkoxycarbonyloxy)-4(1<i>H</i>)-quinolones
作者:Friedrich Hammerschmidt、Anna Woschek、Marek Mahout、Kurt Mereiter
DOI:10.1055/s-2007-966020
日期:——
H)-quinolone was converted in two steps into the 4-ethoxycarbonyloxy-, 4-( TERT-butoxycarbonyloxy)-, and 4-(dimethylaminocarbonyloxy)quinoline N-oxides. While the former two rearranged to the corresponding 1-(alkoxycarbonyloxy)-4(1 H)-quinolones at room temperature, the latter was stable, even at 140 °C in refluxing xylenes. Basic hydrolysis of these compounds furnished 2-heptyl-1-hydroxy-4(1 H)-quinolone
2-庚基-4(1 H)-喹诺酮分两步转化为 4-乙氧基羰氧基-、4-(叔丁氧基羰氧基)-和 4-(二甲基氨基羰氧基)喹啉 N-氧化物。虽然前两者在室温下重排为相应的 1-(烷氧基羰基氧基)-4(1 H)-喹诺酮类,但后者在回流二甲苯中甚至在 140°C 下也是稳定的。这些化合物的碱性水解提供了 2-heptyl-1-hydroxy-4(1 H)-quinolone。