6,8-Dibromo-4-chloroquinoline-3-carbaldehyde as a synthon in the development of novel 1,6,8-triaryl-1H-pyrazolo[4,3-c]quinolines
作者:Marole M. Maluleka、Malose J. Mphahlele
DOI:10.1016/j.tet.2012.10.103
日期:2013.1
2-Amino-3,5-dibromoacetophenone undergoes Vilsmeier reaction with a phosphoryl chloride–dimethylformamide mixture to afford 6,8-dibromo-4-chloroquinoline-3-carbaldehyde. The latter was reacted with arylhydrazine hydrochlorides in ethanol in the presence of triethylamine to afford the corresponding arylhydrazone derivatives. These hydrazones were, in turn, cyclized with ethanolic KOH (5% in ethanol)
2-氨基-3,5-二溴苯乙酮与磷酰氯-二甲基甲酰胺混合物进行Vilsmeier反应,得到6,8-二溴-4-氯喹啉-3-甲醛。在三乙胺存在下,使后者与芳基肼盐酸盐在乙醇中反应,得到相应的芳基a衍生物。接着,将这些ethanol与乙醇KOH(在乙醇中为5%)环合,得到相应的1-芳基-6,8-二溴-1H-吡唑并[4,3- c ]喹啉。这些1-芳基-6,8-二溴-1- Suzuki-Miyaura交叉耦合ħ -吡唑并[4,3- c ^〕喹啉与得到新颖-1,6,8-三芳基-1-芳基硼酸ħ -pyrolo [4, 3- c ]喹啉。