3-Fluoro-, 4-fluoro-, and 2,3,4-trifluorophenyliminopropadienones have been generated by flash vacuum thermolysis (FVT) of 5-[(fluoroarylamino)methoxymethylene]-2,2-dimethyldioxan-4,6-dione (Meldrum’s acid) derivatives. Their reaction with methanol affords interconverting imidoylketenes and oxoketenimines, which are employed in a synthesis of fluoroquinolones. The same quinolones are obtained from methyl 1-fluoroaryl-1,2,3-triazole-4-carboxylates, which on FVT eliminate N2 to generate oxoketenimines. Rearrangement of the oxoketenimines to imidoylketenes and cyclization afford the quinolones.
5-[(fluoroarylamino)methoxymethylene]-2,2-dimethyldioxan-4,6-dione (Meldrum's acid) 衍生物通过闪速真空热解(FVT)生成了 3-氟、4-氟和 2,3,4-三氟苯基亚氨基丙二烯酮。这些衍生物与甲醇反应生成相互转化的亚胺酰基乙烯和氧代乙烯亚胺,可用于合成氟喹诺酮类药物。从 1-氟芳基-1,2,3-三唑-4-羧酸甲酯中也可得到同样的喹诺酮类药物。将这些氧代乙烯亚胺重排为亚咪酰基乙烯,然后进行环化反应,就得到了喹诺酮类化合物。