The preparation and properties of substituted benzo[c]pyrazolo[1:2-a]pyrazol-1:9-diones (Michaeli's benzo-bis-pyrazolones)
作者:Stig Veibel、Hanne Lillelund
DOI:10.1016/0040-4020(57)88040-5
日期:1957.1
A series of substitutedbenzo[c]pyrazolo[1:2-a]pyrazol-1:9-diones has been prepared by condensing β-ketoesters with β-acetyl-(2-carboxyphenyl-) hydrazine, using phosphorus trichloride as condensing agent.
以三氯化磷为缩合剂,通过将β-酮酸酯与β-乙酰基-(2-羧苯基-)肼缩合,制备了一系列取代的苯并[ c ]吡唑并[1:2 - a ]吡唑-1:9-二酮。 。
phenacylester 1, were unsuccesfully tried as starting materials for the synthesis of N-amino-3-hydroxy-2-phenyl-4(1H)-quinolinone 8. The desired compound 8 was prepared by cyclization of N-acetyl as well as N-benzoyl-hydrazinobenzoic acid phenacylester 6a or 6b in polyphosphoric acid to afford N-acylamino-3-hydroxy-2-phenyl-4(1H)-quinolinone 7a or 7b, respectively. Surprisingly, the acyl group was resistant