Hydrodehalogenation of halogenated pyridines and quinolines by sodium borohydride/N,N,N′,N′-tetramethylethylenediamine under palladium catalysis
作者:Giorgio Chelucci
DOI:10.1016/j.tetlet.2010.01.053
日期:2010.3
reported. Catalytic amounts of [1,1′-bis(diphenylphosphino)ferrocene] dichloropalladium(II) in combination with NaBH4–TMEDA rapidly hydrodehalogenate chloro(bromo)-pyridines and -quinolines at room temperature in quantitative yields. Chemoselective reduction of 4,7-dichloroquinoline affords 7-chloroquinoline as the sole product in almost quantitative yield. Moreover, palladium(II) acetate-triphenylphosphine
据报道,在钯催化剂下,硼氢化钠/ N,N,N',N'-四甲基乙二胺(NaBH 4 -TMEDA)体系可将卤代吡啶和喹啉进行加氢脱卤。催化量的[1,1 ' -双(二苯基膦基)二茂铁]在用NaBH组合二氯化钯(II)4 -TMEDA迅速hydrodehalogenate氯(溴)-pyridines并在定量产率室温-quinolines。化学选择性还原4,7-二氯喹啉可提供7-氯喹啉作为唯一产物,几乎定量地收率。此外,乙酸钯(II)-三苯膦和NaBH 4–TMEDA能够有效还原反应性溴吡啶和喹啉。