Reaction of 3-acyl-4-methoxy-1-methylquinolinones 2a,b with hydroxylamine has been investigated under different experimental conditions. Whereas compound 2a gives rise selectively and exclusively to the regioisomeric isoxazolo[4,5-c]- or isoxazolo[4,3-c]quinolin-4(5H)one (compound 3a or 4a, respectively), reaction of 2b always led to a mixture of the required isoxazole together with the oxazole derivative
已经在不同的实验条件下研究了3-酰基-4-甲氧基-1-甲基喹啉酮2a,b与羟胺的反应。尽管化合物2a选择性地和排他性地产生了区域异构的异恶唑并[4,5- c ]-或异恶唑并[4,3- c ]喹啉-4(5 H)酮(分别为化合物3a或4a),但2b总是反应得到所需的异恶唑和恶唑衍生物的混合物。通过多核(13 C和15 N)磁共振波谱可以独立地完成所有产品的结构解析。
Synthesis and reactions of 3-aroyl derivatives of 4-hydroxy-2-quinolones and 4-hydroxycoumarin
作者:Thomas Kappe、Barbara Schnell
DOI:10.1002/jhet.5570330324
日期:1996.5
cyanide and 18-crown-6. A one pot procedure is presented in which the esters do not need to be isolated. Reduction of the aryl ketones 4 and 11 with zinc dust leads to the benzyl derivatives 5 and 12. Reaction of the aryl ketones 4 and 11 with hydroxylamine and subsequent heating of the crude product leads via thermal Beckmann rearrangement and dehydration to oxazoloquinolones 7 and 14. 2-Aroyloxypyrido[1
3-芳酰基-4-羟基-2-喹诺酮类4和11可以开始进行合成1或9 通过Fries重排的相应的酯的3和10,通过氰化钾和18-冠-6催化。提出了一种一锅法,其中不需要分离酯。用锌粉还原芳基酮4和11导致苄基衍生物5和12。芳基酮4和11与羟胺反应,随后加热粗产物,通过贝克曼热重排和脱水生成恶唑喹诺酮7和14。通过Fries重排不能将2-芳氧基吡啶并[1,2- a ]嘧啶-4-酮17和20转化为相应的酮。
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。
PONOMAREV, O. A.;BRUSILTSEV, YU. N.;GRIF, V. X.;MITINA, V. G., YKP. XIM. ZH., 56,(1990) N, S. 272-276
作者:PONOMAREV, O. A.、BRUSILTSEV, YU. N.、GRIF, V. X.、MITINA, V. G.