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。