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.
Cu(i)-catalyzed chemical fixation of CO2 with 2-alkynylaniline into 4-hydroxyquinolin-2(1H)-one
作者:Chun-Xiao Guo、Wen-Zhen Zhang、Si Liu、Xiao-Bing Lu
DOI:10.1039/c3cy00858d
日期:——
copper(I) catalyzed reaction of 2-alkynylaniline with CO2 using DBU as base to produce 4-hydroxyquinolin-2(1H)-one derivatives in moderate to good yield is presented. In this reaction, a unique bond cleavage pattern for CO2 was observed that one of the C–O double bonds of CO2 was totally broken and rearranged into two moieties in the absence of the reductive reagent. This efficient reaction system showed