Heteroelectrocyclic reaction of 4-azido-3-hydrazonoalkyl-quinolines to 2-arylaminopyrazolo[4,3-<i>c</i>]quinolones
作者:Gerhard Hojas、Werner Fiala、Wolfgang Stadlbauer
DOI:10.1002/jhet.5570370625
日期:2000.11
derivatives 1 via tosylates 3 or chlorides 5, reacted with arylhydrazines 6 to generate 4-azido-3-hydrazonoalkylquinolines 7. Thermolysis of 7 gave ring closure products which were assigned to 2-arylaminopyrazolo[4,3-c]quinolones 10. The thermal decomposition conditions of the azides 4 and 7 were studied by differential scanning calorimetry (DSC).
从4-羟基衍生物1经由甲苯磺酸酯3或氯化物5获得的4-叠氮基-3-酰基喹诺酮4与芳基肼6反应,生成4-叠氮基-3-肼基烷基喹啉7。热解7得到闭环产物,其分配给2-芳基氨基吡唑并[4,3- c ]喹诺酮类化合物10。通过差示扫描量热法(DSC)研究了叠氮化物4和7的热分解条件。
Synthesis of oxazolo[4,5-<i>c</i>]quinolones by thermolytic degradation of 4-azido-2(1<i>H</i>)-quinolones
4-Azido-2(1H)-quinolones 1 are thermolyzed in the presence of carboxylic acids and polyphosphoric acid to yield oxazolo[4,5-c]quinolones 3. Formation of other possible isomeric ring closure products such as oxazolo[5,4-c]quinolones 2 or isoxazolo[4,3-c]quinolones 4 could be excluded by independent syntheses.
在羧酸和多磷酸的存在下,将4-Azido-2(1 H)-喹诺酮1进行热解,生成oxazolo [4,5- c ] quinolones3 。形成其他可能的异构闭环产物,例如oxazolo [5,可以通过独立的合成方法排除4- c ]喹诺酮2或异恶唑并[4,3- c ]喹诺酮4。