Studies in Sigmatropic Rearrangement of 3-(4-Aryloxybut-2-ynyloxy)-1-methylquinolin-2-ones: Synthesis of 3H-Pyrano[2,3-c]quinolin-5(6H)-ones and Furo[2,3-c]quinolin-4(5H)-ones
Unusual Ring Contraction of 3H-Pyrano[2,3-c]quinolin-5(6H)-ones to Furo[2,3-c]quinolin-4(5H)-ones
作者:Krishna C. Majumdar、Anup K. Kundu、Paritosh Biswas
DOI:10.3987/com-98-8409
日期:——
Studies in Sigmatropic Rearrangement of 3-(4-Aryloxybut-2-ynyloxy)-1-methylquinolin-2-ones: Synthesis of 3H-Pyrano[2,3-c]quinolin-5(6H)-ones and Furo[2,3-c]quinolin-4(5H)-ones
作者:Krishna C. Majumdar、Anup K. Kundu
DOI:10.3987/com-97-7735
日期:——
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