Studies on Sequential Claisen Rearrangement: Charge‐Accelerated [3,3]‐Sigmatropic Rearrangement Leading to Polyheterocycles
作者:K. C. Majumdar、D. Saha、P. Debnath
DOI:10.1080/00397910701557812
日期:2007.10.1
Abstract A number of quinolone‐annulated pentacycles have been regioselectively synthesized in 90–95% yields by sequential Claisen rearrangements. The second synthesis is anhydrous AlCl3‐catalyzed charge‐accelerated aromatic Claisen rearrangement of 1‐aryloxymethyl‐6‐alkyl‐3H‐pyrano[2,3‐c]quinolin‐5(6H)‐ones in dichloromethane at rt for 5–10 min. The precursors were synthesized by the thermal [3,3]‐sigmatropic
摘要 通过连续克莱森重排,已经区域选择性地合成了许多喹诺酮环化五环化合物,产率为 90-95%。第二种合成是 1-芳氧基甲基-6-烷基-3H-吡喃并[2,3-c]喹啉-5(6H)-酮在室温下在二氯甲烷中进行 5-10 分钟的无水 AlCl3 催化电荷加速芳香克莱森重排. 前体是通过相应醚的热 [3,3]-σ 重排合成的。