Regioselective Synthesis of Coumarin‐Annulated Polyheterocycles by [3,3] Sigmatropic Rearrangement
作者:K. C. Majumdar、B. Chattopadhyay
DOI:10.1080/00397910600908728
日期:2006.10.1
Abstract Several coumarin‐annulated polyheterocycles have been regioselectively synthesized in 82–90% yield by anhydrous AlCl3‐catalyzed charge‐accelerated Claisenrearrangement of 4‐aryloxymethyl [3,2‐c] pyrano benzopyran‐5‐ones in dichloromethane at rt for 0.5 h.