Halogenation reactions in position 3 of quinoline-2,4-dione systems by electrophilic substitution and halogen exchange
摘要:
3-Substituted 4-hydroxy-2(1 H)-quinolones 3, 5, 7 are halogenated with bromine or sulfuryl chloride to yield the quinolinediones 9 or 10. Reaction of 3, 5, 7 with chloroform gives the dichloromethyl quinolinediones 11. Halogen exchange leads from the chloro quinolinediones 10 to fluoro quinolinedones 12 and to azido quinolinediones 13. Similarly the dichloro quinolinedione 10 an reacts to the difluoro quinolinedione 14, which is reduced to the 3-fluoro-4-hydroxyquinolone 16 and reacts again with sulfuryl chloride to give the mixed 3-chloro-3-fluoroquinolinedione 15.
5,7-二甲基-2-苯基-1-氧-1- H-吡唑并[1,2 - a ]吡唑-4-基-3-醇酸酯的微波辅助亲核裂解为α-苯基丙二酰胺
摘要:
在无溶剂微波条件下,通过选择性亲核裂解5,7-二甲基-2-苯基-1-氧-1- H-吡唑并[1,2 - a ]吡唑-4-基-3-醇酸酯制备了三种α-苯基丙二酰胺。合成。采用三种弱亲核体是苯胺,p -chloroaniline和米-甲苯胺。这三种苯胺衍生物的α-苯基丙二酰胺无法使用先前报道的溶剂通过3-氧代吡唑并[1,2 - a ]吡唑-8-基-1-油酸酯来制备。使用红外光谱,1 H nmr和电喷雾质谱对所有产品进行表征。起始吡唑并[[1,2-] a的单晶X射线结构]吡唑和α-phenylmalon-米-toluidide也报道。