Imino Diels–Alder Reactions: Efficient Synthesis of Pyrano and Furoquinolines Catalyzed by ZrCl₄

Abstract

Anhydrous zirconium tetrachloride is found to be an efficient catalyst for the Imino Diels–Alder reactions of N‐benzylideneanilines with 3,4‐dihydro‐2H‐pyran and 2,3‐dihydrofuran to afford pyrano and furo [3,2‐c] quinolines in good yields.

Keywords:

• N‐benzylideneaniline
• 3,4‐dihydro‐2H‐pyran
• 2,3‐dihydrofuran
• Imino Diels–Alder reaction
• Zirconium tetrachloride

Acknowledgments

The authors are thankful to The Director, IICT, for constant encouragement. M.M and Ch.V.R thank CSIR for award of Senior Research Fellowship.