Lewis Acid Catalyzed Reductive Cyclization of 2‐Aryloxybenzaldehydes and 2‐(Arylthio)benzaldehydes to Unsubstituted 9
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‐Xanthenes and Thioxanthenes in Diisopropyl Ether
作者:Shashi Kant Verma、Anamika Prajapati、Manoj Kumar Saini、Ashok K. Basak
DOI:10.1002/adsc.202000836
日期:2021.1.19
Readily accessible 2‐aryloxybenzaldehydes and 2‐(arylthio)benzaldehydes undergo a sequence of reactions leading to a wide variety of unsubstituted 9H‐xanthenes and thioxanthenes in high yields when heated with a Lewisacid in diisopropyl ether. This reductive cyclization method is compatible with several important functional groups. The method is also applicable for the selective reductive cyclization